Catalogues Information


The following catalogues are available through ESASky:

Below there is a brief description of the content of the catalogues. Please note that some catalogues may display rounded or truncated values in ESASky; however, all the original digits are kept when the catalogue tables are downloaded or loaded into a VO application through SAMP.

The catalogue functionality has some known caveats, described here.

 

ASTROMETRIC CATALOGUES

 

GAIA DATA RELEASE 2 (DR2)

The Gaia DR2 catalogue provides positions, parallaxes and proper motions for more than 1.3 billion stars between G-magnitudes 3 and 21, and median radial velocities for more than 7.2 million stars with median G-magnitudes between 4 and 13 and effective temperatures between 3550 and 6900 K. Parallax uncertainties span between 0.04 for G<17 mag and 0.7 mas at G=20. Proper motion uncertainties range from less than 0.06 mas/yr for G<15 mag to 1.2 mas/yr for G=20 mag. The radial velocity precision ranges from 200-300 m/s at the bright end to 1.2 and 2.5 km/s at the faint end for stars of effective temperatures of 4750 and 6500 K, respectively. 

Furthermore, the catalogue provides positions and G-magnitudes for an additional set of more than 361 sources, and BP and RP magnitudes for more than 1.38 billion sources, with precisions between a few milli-mag and around 20 milli-mag.

ESASky displays the following columns from the Gaia DR2 catalogue:

Gaia DR2 catalogue columns displayed in ESASky
Column name Units Description
Name - Gaia Source name
RA (J2015.5)  hh mm ss.ss   Right ascension of source (J2015.5) 
Dec (J2015.5) dd mm ss.s Declination of source (J2015.5)
Parallax mas Parallax of source
Parallax Error mas Parallax error of source
Proper motion in RA mas/yr Proper motion of source in the right ascension direction * COS(declination)
PM in RA Error mas/yr Proper motion error of source in the right ascension direction * COS(declination)
Proper motion in DEC  mas/yr Proper motion of source in the declination direction
PM in DEC Error mas/yr Proper motion error of source in the declination direction
G magnitude mag Gaia mean G-magnitude (column also called phot_g_mean_mag)
G magnitude error mag Gaia mean G-flux over error (column also called phot_g_mean_flux_over_error)
BP-RP mag Gaia mean BP-RP colour
Radial velocity km/s Radial velocity of source
Radial velocity error km/s Radial velocity error
Variable flag - Photometric variable flag

 

For a complete description of this data release, refer to the Gaia content and documentation pages. An overview can be found in this page.

 

HIPPARCOS-2 CATALOGUE

The Hipparcos-2 Catalogue is a new reduction of the data from the Hipparcos mission that improved up to a factor of 4 the accuracy of stars with Hp magnitude 8 or lower. It contains positions, parallaxes and proper motions for 118,218 stars. For more information on this catalogue, go to this page or to Vizier.

ESASky displays the following columns from the Hipparcos-2 catalogue:

Hipparcos-2 catalogue columns displayed in ESASky
Column name Units Description
Name - Source name
Right Ascension  hh mm ss.ss  Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Proper motion in RA mas/yr Proper motion of source in the right ascension direction * COS(declination)
Proper motion in DEC  mas/yr Proper motion of source in the declination direction
Parallax mas Parallax of source
Magnitude mag Hipparcos magnitude

 

 

TYCHO-2 CATALOGUE

The Tycho-2 Catalogue is an astrometric reference catalogue containing positions, proper motions and two-colour photometry (B and V) for the 2.5 million brightest stars in the sky. The catalogue is based on observations made using the Hipparcos satellite star mapper and is constructed using the same observations that were used to create the original Tycho catalogue. Improved reduction techniques have resulted in a catalogue with significantly more entries and in improved precision. More information on the Tycho-2 catalogue can be found here and in Vizier.

ESASky displays the following columns from the Tycho-2 catalogue:

Tycho-2 catalogue columns displayed in ESASky
Column name Units Description
Name - Source name
Right Ascension  hh mm ss.ss  Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Proper motion in RA mas/yr Proper motion of source in the right ascension direction * COS(declination)
Proper motion in DEC  mas/yr Proper motion of source in the declination direction
BT magnitude mag Tycho-2 B magnitude
VT magnitude mag Tycho-2 V magnitude

 

 

FOURTH integral IBIS/IGRI SOFT GAMMA-RAY SOURCE catalog

The IBIS/ISGRI Soft Gamma-Ray Source Catalog is an all-sky catalog based on INTEGRAL-IBIS observations performed during the first 1000 orbits of the satellite. The catalogue was released in 2009 and updated in 2016. It is constructed from all public good-quality data available from the mission launch in 2002 up to the end of 2010, and it includes 939 sources significantly detected in the 17-100 keV energy band, of which 120 are previously undiscovered soft gamma-ray emitters. For more information on this catalogue, read the above references, or go to Vizier.

ESASky displays the following columns of this catalogue:

IBIS/ISGRI Catalogue columns displayed in ESASky
Column name Units Description
Name - Source name
Right ascension     hh mm ss.ss   Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Flux20-40 keV mCrab Flux in the 20-40 keV band
Flux40-100 keV mCrab Flux in the 40-100 keV band
Type - Object type
Significance - Maximum significance in a single map
Exposure ksec Exposure time in kiloseconds

 

 

xmm-newton catalogues

The following catalogues from the XMM-Newton mission are included in ESASky: 4XMM-DR9, 4XMM-DR9sXMMSL2, XMM-SUSS4.1.

 

THE XMM-NEWTON SERENDIPITOUS SOURCE CATALOGUE (4XMM-DR9)

The 4XMM-DR9 catalogue contains source detections drawn from 11,204 XMM-Newton EPIC observations, covering an energy interval from 0.2 keV to 12 keV. More information on this catalogue can be found on the above reference or in this page. Presently, only sources with QUALITY flag equals 0 or 1 (sources "good" or "with suspect parameters") are displayed in ESASky.

4XMM-DR9 characteristics
Number of observations 11,204
Number of 'clean' observations 9,441
Sky coverage 1152 sq.deg
Number of detections 810,795
Number of 'clean' detections (quality flag < 3) 713,966
Number of unique sources 550,124
Number of 'cleanest' extended detections (quality flag = 0, not in high background fields) 17,295
Number of detections with spectra 288,521
Number of detections with time series 288,282
Number of detections with probable constant time series (P <  1  × 10-5) 6,696

 

ESASky displays the following columns of the 4XMM-DR9 catalogue:

4XMM-DR9 columns displayed in ESASky
Column name Units Description
Name - Name of source
RA  hh mm ss.ss  Right ascension of source (J2000)
Dec dd mm ss.s Declination of source (J2000)
Flux erg·cm-2·s-1 Mean EPIC total flux in the 0.2-12.0 keV band
Flux Error erg·cm-2·s-1 EPIC Flux error in the 0.2-12.0 keV band
Flux0.5-1keV erg·cm-2·s-1 Mean total flux
Flux Error0.5-1keV erg·cm-2·s-1 Flux error
Flux1-2keV erg·cm-2·s-1 Mean total flux
Flux Error1-2keV erg·cm-2·s-1 Flux error
Flux2-4.5keV erg·cm-2·s-1 Mean total flux
Flux Error2-4.5keV erg·cm-2·s-1 Flux error
Flux4.5-12keV erg·cm-2·s-1 Mean total flux
Flux Error4.5-12keV erg·cm-2·s-1 Flux error
Start Time MJD Mean total flux

 

Also provided is a preview of the observation where each source was detected. The name of the source is linked to an XSA results page with all detections of this source.

 

The XMM-newton catalogue of serendipitious sources from stacked observations (4xmm-DR9s)

The stacked catalogue 4XMM-DR9s has been compiled from 1 329 groups, comprising 6 604 overlapping good-quality XMM-Newton observations. They were selected from the public observations taken between 2000 February 3 and 2018 November 13 which overlap by at least one arcminute in radius and are not affected by very high background emission. It contains 288 191 unique sources, 218 283 of them multiply observed, with positions and source parameters like fluxes in the XMM-Newton standard energy bands, hardness ratios, quality estimate, and information on inter-observation variability. For more details, go to the paper above or to this page.

4XMM-DR9s characteristics
Number of stacks 1,329
Number of observations 6,604
Approximated sky coverage  485 sq.deg
Approximated multiply observed sky area 300 sq.deg
Number of sources 288,191
Number of sources with several contributing observations 218,283


ESASky displays the following columns of the 4XMM-DR9s catalogue:

4XMM-DR9s columns displayed in ESASky
Column name Units Description
Name - Name of source
IAU Name IAU name of source
RA hh mm ss.ss Right ascension of source (J2000)
Dec dd mm ss.s Declination of source (J2000)
Flux erg·cm-2·s-1 Mean total flux
Flux Error erg·cm-2·s-1 Flux error
N. Contrib. - Number of observations in which the source was fitted
N. Obs. - Number of observations involved in the stack
Start time MJD Date of the start of the observation
EP Ontime s Total good exposure time at the central position of the source
Extent arcsec Source extent radius
Extent err arcsec Error in the source extent radius
Flux var. - Largest difference between fluxes (in terms of sigma)

 

 

the XMM-Newton SLEW CATALOGue 2.0

​XMMSL2 is the second catalogue of X-ray sources found in slew data taken from the European Space Agency's (ESA) XMM-Newton observatory, and has been constructed by members of the XMM SOC and the EPIC consortium on behalf of ESA. This release uses results of work which has been carried out within the framework of the EXTraS project ("Exploring the X-ray variable and Transient Sky"), funded from the EU's Seventh Framework Programme under grant agreement no.607452. 

XMMSL2 has been generated from 2114 slews, executed between 2001-08-26 and 2014-12-31, revolutions 314 to 2758. Not all slews made in this period have been used; slews with particularly high background throughout the slew or which gave processing problems have been rejected. A description of slew selection and initial processing is given here. The slews have been processed separately in three energy bands to form three distinct surveys which have been subsequently combined to form one catalogue. After correcting for overlaps between slews, 84% of the sky has now been covered.

The release includes two FITS files. A full catalogue (xmmsl2_total.fits.gz), containing 72352 detections found with a likelihood of DET_ML>8 and a "clean" catalogue (xmmsl2_clean.fits.gz) where all known bad sources have been removed and where the detection limit has been raised to DET_ML>10.5 in general and DET_ML>15.5 for sources found in images with a higher than usual background. Efforts have been made to identify spurious detections and 3017 have been flagged as such in the full catalogue

The columns from this catalogue displayed in ESASky are the following:

XMMSL2 columns displayed in ESASky
Column name Units Description
Name - Name of source
Right ascension   hh mm ss.ss Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Flux (0.2-12kev) erg·cm-2·s-1 Flux in the 0.2-12 keV band
Flux Error (0.2-12kev) erg·cm-2·s-1 Flux error in the 0.2-12 keV band
Flux (2-12kev) erg·cm-2·s-1 Flux in the 2-12 keV band
Flux Error (2-12kev) erg·cm-2·s-1 Fluxerror in the 2-12 keV band
Flux (0.2-2kev) erg·cm-2·s-1this​ Flux in the 0.2-2 keV band
Flux Error (0.2-2kev) erg·cm-2·s-1 Flux error in the 0.2-2 keV band


 

XMM-OM serendipitous ultraviolet source survey CATALOGue (XMM-suss4.1)

The SUSS4.1 catalogue is a catalogue of sources serendipitously detected by the Optical Monitor (OM) on board the XMM-Newton observatory. It provides source positions, magnitudes and fluxes in six broad-band ultraviolet and optical filters for more than 5.5 million sources, as well as profile diagnostics and variability statistics. 

SUSS4.1 characteristics
Number of observations 9,749
Number of entries 8,176,156
Number of unique sources 5,503,765
Number of sources with repeated observations 1,035,453

 

The data processing was performed at the European Space Astronomy Centre (ESAC, Madrid, Spain) using the XMM Science Analysis Software system (SAS) version 17.0. In addition to covering a larger observation period, this release differs from the previous one in the implementation of a new time dependent sensitivity degradation correction. As in the previous release, sources detected on stacked images are properly flagged. For more details on this release of the catalogue, go to this page.

These are the columns from the SUSS4.1 catalogue displayed in ESASky:

SUSS4.1 columns displayed in ESASky
Column name Units Description
Name - Name of source
Observation ID - Observation ID number
Right ascension   hh mm ss.ss  Right ascension of source (J2000)
Declination  dd mm ss.s Declination of source (J2000)
DPos - The statistical error on the source position as returned by the source detection software.
UVW1 Flux erg·cm-2·s-1 Flux in the UVW1 band
UVW2 Flux erg·cm-2·s-1 Flux in the UVW2 band
UVM2 Flux erg·cm-2·s-1 Flux in the UVM2 band
U Flux erg·cm-2·s-1 Flux in the U band
V Flux erg·cm-2·s-1 Flux in the V band
B Flux erg·cm-2·s-1 Flux in the B band

 

 

Hubble Source Catalog (HSC)

The Hubble Source Catalog is a combination of all the visit-based source lists in the Hubble Legacy Archive (HLA) into a single catalogue and is designed to optimize science from the Hubble Space Telescope by combining the tens of thousands of visit-based source lists in the HLA into a single master catalog.

The HSC v3 contains members of the WFPC2, ACS/WFC, WFC3/UVIS and WFC3/IR Source Extractor source lists from HLA version DR10 (data release 10). The cross-matching process involves adjusting the relative astrometry of overlapping images so as to minimize positional offsets between closely aligned sources in different images. After correction, the astrometric residuals of cross-matched sources are significantly reduced, with median errors less than 8 mas. The absolute astrometry is calibrated using Gaia DR1, Pan-STARRS, SDSS, and 2MASS as the astrometric backbone for initial corrections. In addition, the catalog includes source nondetections. The cross-matching algorithms and the properties of the initial (Beta 0.1) catalog are described in Budavari & Lubow (2012), and the Version 1 catalog is described in Whitmore et al. (2016).

Version 3 includes (see here for more details):

  • There are approximately 25% more ACS source lists and almost twice as many WFC3 source lists compared with HSC v2.
  • The source list photometric quality is significantly improved.
  • Improved astrometric calibration is based on the Gaia DR1 catalog. Shifts up to 100 arcsec have been correctly identified. 94% of the fields have matches to an external astrometric reference catalog.
  • The scatter in magnitudes is measured using the median absolute deviation (MAD) of the differences from the median magnitude for more robust estimates.

 

ESASky displays the following columns from the Hubble Source Catalog:

HSC columns displayed in ESASky
Column name Units Description
Match ID - The HSC match ID number. Details here
Target Name - Target name for one of the observations
Number Of Images - Number of images used in the match (column also called num_images)
Number Of Images Per Filter - Number of images used in the match per filter
RA    hh mm ss.ss  Right ascension for the match (J2000)
Dec dd mm ss.s Declination for the match (J2000)
Filters - Filter for the match, one filter per row. First part of the filter name corresponds to the instrument, where w3 = WPC3; w2 = WFPC2; a = ACS 
Magnitude mag Median magnitude for the corresponding filter.
Magnitude error mag Median absolute deviation around the median magnitude.

 

Note: There is a small positional offset (< 1") between the source coordinates from the HSC and their location on the HST HiPS maps. This is due to the fact that the HST HiPS were generated from HST data products, while the HSC was created from HLA data products, and there is a discrepancy between the astrometric solutions from both samples. An improved sample of HST HiPS will be produced soon.

See the Caveats page for caveats on the HSC.

 

HERSCHEL CATALOGUES

ESASky provides access to the following catalogues from the Herschel mission: the Herschel-PACS Point Source Catalogue (HPPSC) and the Herschel-SPIRE Point Source Catalogue (HSPSC)

 

HERSCHEL-PACS POINT SOURCE CATALOGUE (HPPSC)

The Herschel-PACS Point Source Catalogue (HPPSC), released on 17th May 2017, contains about half million entries distributed over the three bands of the Photodetector Array Camera and Spectrometer (PACS) onboard Herschel, which mapped ~8% of the far-infrared sky. The broad-band filters were centred at 70, 100 and 160 μm, allowing an angular resolution of 5.6ʺ, 6.8ʺ and 11.3ʺ, respectively. 

The catalogue consists of three tables, one per each of these bands. The table below summarises the columns from each table that are displayed in ESASky.

HPPSC columns displayed in ESASky
Column name Units Description
Name - Name of source
Right Ascension   hh mm ss.ss  Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Flux mJy Flux density
ΔFlux mJy Flux density error
FWHM_x Fit arcsec FWHM in x direction
FWHM_y Fit arcsec FWHM in y direction
S/N_S - Structure noise-based signal-to-noise ratio
S/N_R - Flux-based signal-to-noise ratio 
elong flag - Elongation flag (0=circular)
edge flag - Edge flag (True/False)
blend flag - Blend flag (0=not blended)
warmat - Affected by warm attitude (True/False)
ssomap flag - Solar System Map flag (True/False)
Observation ID - First Observation ID from the list of observations that built the map  

  

For details on the HPPSC, and to get the full catalogues, go to this page.

 

HERSCHEL-SPIRE POINT SOURCE CATALOGUE (HSPSC)

The SPIRE Point Source Catalogue (SPSC) was released on 7th February 2017 jointly by the NASA Herschel Science Center and the ESA Herschel Science Centre. It contains more than 1.6 million entries extracted from a total 6878 observations in the sub-millimetre range made by the Spectral and Photometric Imaging Receiver (SPIRE) onboard Herschel. 

The catalogue consists of three tables, one per each of the three SPIRE photometric bands, centred at 250, 350 and 500 microns (1199, 857 and 600 GHz, respectively). The table below summarises the columns from these three subcatalogues that are displayed in ESASky. 

HSPSC columns displayed in ESASky
Column name Units Description
Name - Name of source
Right Ascension   hh mm ss.ss  Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
SNR - Signal-to-noise ratio
Flux mJy TML flux density 
ΔFlux  mJy Propagated weighted error in the TML flux density
FluxDao mJy Daophot flux density 
ΔFluxDao mJy Propagated weighted error in the Daophot flux density
FluxTM2 mJy TM2 flux density 
ΔFluxTM2 mJy Propagated weighted error in the TM2 flux density
pntsrc flag - Point source flag
extsrc flag - Extended source flag
lowfwhm flag - Low FWHM flag
largegal flag - Large galaxy flag
mapedge flag - Map edge flag
ssocont flag - SSO contaminator flag

 

For details on the different flux density measurements provided by the catalogue, refer to the Explanatory Supplement. To access the full SPSC catalogue and its Explanatory Supplement, go to this page.  

 

 

planck catalogues

ESASky provides access to the following catalogues from the Planck mission: PCCS2, Planck SZ2, PGCC

For a full description of the catalogues, go to this page or to the reference papers cited below.

 

second PLANCK CATALOGue OF COMPACT SOURCES (PCCS2)

The PCCS2 is a set of single-frequency source catalogues extracted from the Planck full-mission maps in intensity and polarization. These maps contain 48 months of data for the LFI channels, and 29 months of data for the HFI channels,  therefore the flux densities derived from these maps are an average of the source emission over these two periods of time. For the channels 30-353 GHz, the catalogues also contain polarization flux densities and polarization angles for sources with a significance in polarization >99.99%.

The catalogue at 100 Ghz and above has been divided into two subcatalogues: the PCCS2, including all reliable detections (>80%), and PCCS2E, including sources located in sky regions where it was not possible to estimate their reliability.

PCCS2 characteristics

Channel

Frequency (Ghz)

Wavelength (µm)

30

28.4

10561

44

44.1

6807

70

70.4

4260

100

100.0

3000

143

143.0

2098

217

217.0

13.82

353

353.0

850

545

545.0

550

857

857.0

350

Number of sources 1,560 934 1,296 1,742 2,160 2,135 1,344 1,694 4,891
Number of significantly polarized sources 122 30 34 20 25 11 1 - -
Minimum polarized flux density (mJy) 117 181 284 138 148 166 453 - -
Polarized flux density uncertainty (mJy) 46 88 91 30 26 30 81 - -

 

PCCS2E characteristics

Channel

Frequency (Ghz)

Wavelength (µm)

30

28.4

10561

44

44.1

6807

70

70.4

4260

100

100.0

3000

143

143.0

2098

217

217.0

13.82

353

353.0

850

545

545.0

550

857

857.0

350

Number of sources - - - 2,487 4,139 16,842 22,665 31,068 43,290
Number of significantly polarized sources - - - 43 111 325 666 - -
Minimum polarized flux density (mJy) - - - 121 87 114 348 - -
Polarized flux density uncertainty (mJy) - - - 52 44 55 178 - -

 

The following table summarises the columns from the catalogues displayed in ESASky:

PCCS2 columns displayed in ESASky
Column name Units Description
Name - Name of source
Right ascension    hh mm ss.ss   Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Frequency GHz  Planck Frequency
Flux density mJy Channel flux density
Flux density error  mJy Error in channel flux density
Extended Source Flag - Extended source flag, 0 if the source is compact and 1 if the source is extended.
Cat. Reliability - The highest reliability catalogue to which the source belongs. As the full catalogue reliability is >=80%, this is the lowest possible value in this column.

 

 

SECOND planck sunyaev-zeldovitch catalogue (Psz2)

The Planck SZ catalogue is a nearly all-sky list of SZ detections obtained from the Planck data, derived from the HFI frequency channel maps after masking and filling the bright point sources (SNR>10) from the PCCS catalogues in those channels. It contains 1653 detection, of which 1203 are confirmed clusters with identified counterparts in external datasets.

The catalogue was constructed using three detection pipelines: two implementations of the matched multi-filter algorithm (MMF1 and MMF2) and a Bayesian algorithm called PowellSnakes (PwS). A union catalogue was constructed from the detections of all three pipelines. To avoid spurious detections due to foreground sources, a mask to remove Galactic dust, nearby galaxies and point sources was applied after the merging, leaving 83.7% of the sky.

The union catalogue contains the coordinates of a detection, its signal-to-noise ratio, an estimate of the total integrated Comptomization parameter Y and its uncertainty, as well as information on the generation and validation. If available, external identification of a cluster and its redshift is also provided. When more than one pipeline makes the same detection, the information is taken from the most significant detection. If the redshift is known, the SZ mass from the reference pipeline is provided.

The table below shows the columns from this catalogue displayed in ESASky:

PSZ2 columns displayed in ESASky
Column name Units Description
Name - Source name
Right Ascension   hh mm ss.ss   Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Signal to noise - Signal-to-noise ratio of the detection
Redshift - Redshift of cluster
Sundyaev-Zeldovitch mass  1014 MSun Sundyaev-Zeldovitch mass proxy
Validation - External validation status

 

 

planck catalogUE of galactic cold clumps (PGCC)

The PGCC containes 13,188 Galactic sources and 54 sources located in the Magellanic Clouds, all of them identified as cold sources in Planck data (sources colder than their environment). The sources are extracted from the Planck HFI 857, 545 and 353 GHz maps and the 3 THz IRIS map. A detection requires SNR > 4 in pixels in all Planck bands and a minimum angular distance of 5 arcmin to other detections.

The derived physical properties of the PGCC sources are: temperature, column density, physical size, mass, density, and luminosity. The sources span a temperature range from 5.8 to 20 K, and a variety of physical properties corresponding to many different types of objects, from dense cold cores to large molecular clouds.

These are the columns from the PGCC catalogue displayed in ESASky:

PGCC columns displayed in ESASky
Column name Units Description
Name - Name of source
Right Ascension   hh mm ss.ss  Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Signal to Noise - Maximum S/N over the 857, 545 and 353 GHz Planck cold residual maps
Major FWHM arcmin FWHM along the major axis of the elliptical Gaussian
Major FWHM error  arcmin Error in the major axis FWHM
Minor FWHM arcmin FWHM along the minor axis of the elliptical Gaussian
Minor FWHM error  arcmin Error in the minor axis FWHM

 

 

CATALOGUES FROM OTHER DATA PROVIDERS

 Akari IRC Point Source Catalogue

The AKARI IRC Point Source Catalogue Version 1.0 provides positions and fluxes of 870,973 sources (844,649 sources in 9 micron band and 194,551 sources in 18 micron band) in the Mid-Infrared wavelengths.

The IRC scanned 96 / 97 percent of the entire sky in 9 / 18 micron band twice or more during the 16 months of the cryogenic mission phase. The Point Source Catalogue is the primary catalogue from the AKARI IRC survey. The catalogue is designed to have a uniform detection limit over the entire sky, based on the uniform source detection limit per scan observation. Redundant observations are used to increase the reliability of the detection.

The AKARI IRC Release Note documentation can be found here.

AKARI IRC Point Source Catalogue columns displayed in ESASky
Column name Units Description
Name - Name of source
Right Ascension   hh mm ss.ss  Right ascension of source (J2000)
Declination dd mm ss.s Declination of source (J2000)
Flux S9W Jy Flux density in S9W
Flux S9W error Jy Flux error in S9W
Flux L18W Jy Flux density in L18W
Flux L18W error Jy Flux error in L18W
Flag S9W - Bit flags data quality for S9W:
Values are expressed in Hexadecimal format.
1: Period between first and last detection is less than a month
2: Saturated (not currently used)
4: use SAA (not currently used)
8: use edge events, flux underestimated
Flag L18W - Bit flags data quality for L18W:
Values are expressed in Hexadecimal format.
1: Period between first and last detection is less than a month
2: Saturated (not currently used)
4: use SAA (not currently used)
8: use edge events, flux underestimated
Extended Flag S9W - Extended source flag for S9W:
Set to 1 if MEAN_AB09 > 15.6 arcsec
Extended Flag L18W - Extended source flag for L18W:
Set to 1 if MEAN_AB18 > 15.6 arcsec
Number of S9W Events - Number of events contributing to FLUX S9W
Number of L18W Events - Number of events contributing to FLUX L18W

 

 

 CHANDRA SOURCE CATALOG (CSC2)

The Chandra Source Catalog (CSC) is the definitive catalog of X-ray sources detected by the Chandra X-ray Observatory. By combining Chandra's sub-arcsecond on-axis spatial resolution and low instrumental background with consistent data processing, the CSC delivers a wide variety of uniformly calibrated properties and science ready data products for detected sources over four decades of flux. The second major release of the catalog, CSC 2.0, includes measured properties for 317,167 unique compact and extended X-ray sources in the sky, allowing statistical analysis of large samples, as well as individual source studies. Extracted properties are provided for 928,280 individual observation detections identified in 10,382 Chandra ACIS and HRC-I imaging observations released publicly through the end of 2014. CSC 2.0 includes—as an "alpha" release—photometric properties for 1,299 highly extended (≳30″) sources, together with surface brightness polygons for several contour levels. All can be retrieved, together with the full list of parameters available in the full catalog for each source, using CSCview. Go here for more information on the CSC.

CSC2 columns displayed in ESASky
Column name Units Description
Name - Name of source
RA  hh mm ss.ss Right ascension of source (J2000)
Dec dd mm ss.s Declination of source (J2000)
Flux ACIS erg·cm-2·s-1 ACIS broad band, b (0.5-7.0 keV), aperture-corrected net energy flux inferred from the source region aperture, best estimate derived from the longest block of a multi-band, flux-ordered Bayesian Block analysis of the contributing observations, and calculated by counting X-ray events (column also called flux_aper_b).
Lower Flux ACIS erg·cm-2·s-1 Lower 1 sigma (68.2%) Flux ACIS broad band, b (0.5-7.0 keV) confidence limit (column also called flux_aper_lolim_b).
Upper Flux ACIS erg·cm-2·s-1 Upper 1 sigma (68.2%) Flux ACIS broad band, b (0.5-7.0 keV) confidence limit (column also called flux_aper_hilim_b).
Flux HRC erg·cm-2·s-1 HRC wide band, w (~0.1-10.0 keV), aperture-corrected net energy flux inferred from the source region aperture, best estimate derived from the longest block of a multi-band, flux-ordered Bayesian Block analysis of the contributing observations, and calculated by counting X-ray events (column also called flux_aper_w).
Lower Flux HRC erg·cm-2·s-1 Lower 1 sigma (68.2%) Flux HRC wide band, w (~0.1-10.0 keV), confidence limit (column also called flux_aper_lolim_w)
Upper Flux HRC erg·cm-2·s-1 Upper 1 sigma (68.2%) Flux HRC wide band, w (~0.1-10.0 keV), confidence limit (column also called flux_aper_hilim_w)
Average Flux ACIS erg·cm-2·s-1 Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; ACIS broad (0.5-7.0 keV) energy band (column also called flux_aper_avg_b).
Average Lower Flux ACIS erg·cm-2·s-1 Lower 1 sigma (68.2%) average Flux ACIS broad band, b (0.5-7.0 keV), confidence limit (column also called flux_aper_avg_lolim_b).
Average Upper Flux ACIS erg·cm-2·s-1 Upper 1 sigma (68.2%) average Flux ACIS broad band, b (0.5-7.0 keV), confidence limit (column also called flux_aper_avg_hilim_b).
Average Flux HRC erg·cm-2·s-1 Aperture-corrected net energy flux inferred from the source region aperture, averaged over all contributing observations, and calculated by counting X-ray events; HRC wide (~0.1-10.0 keV) energy band (column also called flux_aper_avg_w).
Average Lower Flux HRC erg·cm-2·s-1 Lower 1 sigma (68.2%) average Flux HRC wide band, w (~0.1-10.0 keV), confidence limit (column also called flux_aper_avg_lolim_w).
Average Upper Flux HRC erg·cm-2·s-1 Upper 1 sigma (68.2%) average Flux HRC wide band, w (~0.1-10.0 keV), confidence limit (column also called flux_aper_avg_hilim_w).
Major radius of error ellipse arcsec Major radius of the 95% confidence level position error ellipse (column also called err_ellipse_r0).
Minor radius of error ellipse arcsec Minor radius of the 95% confidence level position error ellipse (column also called err_ellipse_r1).
Position angle error ellipse degrees Position angle (referenced from local true north) of the major axis of the 95% confidence level error ellipse (column also called err_ellipse_ang).
Highest Flux Significance - Highest flux significance across all stacked observations and science energy bands (column also called significance).
Likelihood - Highest detection log-likelihood across all stacked observations and science energy bands (column also called likelihood).
Likelihood Classification - Highest detection likelihood classification across all stacked observations and science energy bands (column also called likelihood_class).
Confusion Flag - Source may be confused (source and/or background regions overlap in one or more contributing stacked observations; column also called conf_flag).
Extent Flag - Source is extended, or deconvolved source extent is inconsistent with a point source at the 90% confidence level in one or more observations and science energy bands (column also called extent_flag).
Source Saturation Flag - Source is saturated in all observations; source properties are unreliable (column also called sat_src_flag).
Source Streak Flag - Source is located on an ACIS readout streak in all observations; source properties may be affected (column also called streak_src_flag).
Variability Flag - Source displays flux variability within one or more observations, or between observations, in one or more energy bands (column also called var_flag).
Hardness Ratio Variability Flag - Source hardness ratios are statistically inconsistent between two or more observations (column also called var_inter_hard_flag).
Hard-Medium Hardness Ratio - ACIS hard (2.0-7.0 keV) - medium (1.2-2.0 keV) energy band hardness ratio (column also called hard_hm).
Lower Hard-Medium Hardness Ratio - ACIS hard (2.0-7.0 keV) - medium (1.2-2.0 keV) energy band hardness ratio (68% lower confidence limit; column also called hard_hm_lolim).
Upper Hard-Medium Hardness Ratio - ACIS hard (2.0-7.0 keV) - medium (1.2-2.0 keV) energy band hardness ratio (68% upper confidence limit; column also called hard_hm_hilim).
Medium-Soft Hardness Ratio - ACIS medium (1.2-2.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio (column also called hard_ms).
Lower Medium-Soft Hardness Ratio - ACIS medium (1.2-2.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio (68% lower confidence limit; column also called hard_ms_lolim).
Upper Medium-Soft Hardness Ratio - ACIS medium (1.2-2.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio (68% upper confidence limit; column also called hard_ms_hilim).
ACIS Intra-Obs Variability Index - Intra-observation Gregory-Loredo variability index in the range [0, 10] for the ACIS broad band, b (0.5-7.0 keV). A low value indicates that the source region photon flux is constant between observations whereas a high value indicates that the source is very likely to be variable (column also called var_intra_index_b).
HRC Intra-Obs Variability Index - Intra-observation Gregory-Loredo variability index in the range [0, 10] for the wide band, w (~0.1-10.0 keV). A low value indicates that the source region photon flux is constant within an observation (highest value across all observations), whereas a high value indicate that flux is variable within the observation (column also called var_intra_index_w).
ACIS Inter-Obs Variability Index - Inter-observation variability index in the range [0, 10]: indicates whether the source region photon flux is constant between observations for the broad band, b (0.5-7.0 keV; column also called var_inter_index_b).
HRC Inter-Obs Variability Index - Inter-observation variability index in the range [0, 10]: indicates whether the source region photon flux is constant between observations for the wide band, w (~0.1-10.0 keV; column also called var_inter_index_w).
Hard-Medium Hardness Ratio Variability Prob - Inter-observation ACIS hard (2.0-7.0 keV) - medium (1.2-2.0 keV) energy band hardness ratio variability probability, which indicates
whether the source is spectrally variable when these two bands are considered (column also called var_inter_hard_prob_hm).
Medium-Soft Hardness Ratio Variability Prob - Inter-observation ACIS medium (1.2-2.0 keV) - soft (0.5-1.2 keV) energy band hardness ratio variability probability, which indicates
whether the source is spectrally variable when these two bands are considered (column also called var_inter_hard_prob_ms)
ACS Time seconds Total livetime for all ACIS imaging observations contributing to the Master Sources Table record of the source (column also called acs_time).
HRC Time seconds Total livetime for all HRC imaging observations contributing to the Master Sources Table record of the source (column also called hrc_time).

 

 

LAMOST GENERAL catalog (LAMOST DR5)

The Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) is a Chinese national scientific research facility operated by the National Astronomical Observatories, Chinese Academy of Sciences. It is a special reflecting Schmidt telescope with 4000 fibers in a field of view of 20 degrees. The LAMOST survey, initiated in 2012, provides flux- and wavelength-calibrated, sky-subtracted spectra in the wavelength range of 3690-9100 angstrom with a resolution of 1800 at the 5500 angstrom.for many types of astronomical objects.

The fifth LAMOST data release (LAMOST DR5) includes observations until July 2017. The General Catalog contains 9,026,365 targets, of which 8,183,160 are stars, 152,863 galaxies, 52,453 QSO, and 637,889 unknown objects. There are 5,808,985 objects with g-band SNR larger than 10, 7,701,235 objects with i-band SNR larger than 10, and 5,734,239 objects with both g-band SNR larger than 10 and i-band SNR larger than 10.

The following columns have been included in ESASky:

LAMOST General Catalogue columns displayed in ESASky
Column name Units Description
Name - Target name
RA (J2000) hh mm ss.ss  Right ascension of fiber pointing (J2000)
Dec (J2000) dd mm ss.s Declination of fiber pointing (J2000)
ObsID - Observation ID
Start time dd-mm-yyyy  
End time dd-mm-yyyy  
Object type - Object type
Class - Stellar spectral type
Subclass - Stellar subclass
z - Redshift
z_err - Redshift uncertainty
SNR u - Signal-to-noise ratio of u filter
SNR g - Signal-to-noise ratio of g filter
SNR r - Signal-to-noise ratio of r filter
SNR i - Signal-to-noise ratio of i filter
SNR z - Signal-to-noise ratio of z filter
Effective Temperature  K Effective temperature of the star
Surface Gravity cm/s2 Surface gravity of the star
Metallicity - Metallicity of the star
Radial Velocity km/s Heliocentric radial velocity of the star

 

In addition to the General Catalog, LAMOST DR5 provides three stellar catalogues, an Observed Plate Information Catalog and an Input Catalog. For now, these catalogues have not been integrated in ESASky. Refer to this page for more information on this data release.

 

 2MASS All-sky catalog of point sources

The Two-Micron All Sky Survey (2MASS) covered 99.998% of the sky in three near-infrared bands, J, H and Ks. The 2MASS Point Source Catalog (PSC) contains positional and photometric information for 470,992,970 point sources. Sources in this catalogue are detected in at least one band with S/N higher than 7, or in all three bands with S/N higher than 5. In addition, the source position must fulfil some conditions to ensure it is not a spurious detection or there is confusion between sources.

The table below shows the columns of the 2MASS catalogue displayed in ESASky:

2MASS catalogue columns displayed in ESASky
Column name Units Description
Name - Name of source
RA (J2000)   hh mm ss.ss  Right ascension of source (J2000)
DEC (J2000) dd mm ss.s Declination of source (J2000)
J mag mag J-band magnitude
ΔJ mag mag Error in J-band magnitude
H mag mag H-band magnitude
ΔH mag mag Error in H-band magnitude
Ks mag mag Ks-band magnitude
ΔKs mag mag Error in Ks-band magnitude

 

See the IPAC 2MASS documentation for more details on this catalogue.

 

 AllWISE SOURCE catalog

The AllWISE Source Catalog provides astrometry and mid-infrared photometry in four bands (3.4, 4.6, 12 and 22 microns) for 747,634,026 objects detected on the deep AllWISE Atlas Intensity Images. It improves the photometry of discrete sources in all four bands with respect to the WISE Catalog. In addition, improved source variability metrics have been computed. Astrometry has also been improved thanks to the correction of the proper motion of the reference 2MASS stars for the 11 years between the two surveys.

The table below shows the columns of the AllWISE catalogue displayed in ESASky:

AllWISE catalogue columns displayed in ESASky
Column name Units Description
Name - Name of source
RA (J2000)   hh mm ss.ss  Right ascension of source (J2000)
Dec (J2000) dd mm ss.s Declination of source (J2000)
ΔRA arcsec Error in right ascension
ΔDec arcsec Error in declination
W1 mag mag W1-band magnitude
ΔW1 mag mag Error in W1-band magnitude
W2 mag mag W2-band magnitude
ΔW2 mag mag Error in W2-band magnitude
W3 mag mag W3-band magnitude
ΔW3 mag mag Error in W3-band magnitude
W3 mag mag W3-band magnitude
ΔW4 mag mag Error in W4-band magnitude

 

Refer to this page for more information on the WISE survey and this catalog.