ESASky Legacy TAP: EU-funded Projects

ESASky legacy is a TAP (Table Access Protocol) service to provide the community access to complete, self-standing catalogues and data collections from ESA astronomy legacy missions, ensuring their long-term preservation. This service, which is an IVOA standard for most modern science archives, is an entry point to data products and their successors that can be exposed by ESASky.

 

The European Commission Research Executive Agency) (H2020 and FP7) projects available in the ESASky legacy TAP are:

 

Herschel Extragalactic Legacy Project (HELP):

 

The Herschel Extragalactic Legacy Project ([HELP] http://www.herschel.sussex.ac.uk) is a European Commission Research Executive Agency funded programme specifically targeted to analysing the far infrared extragalactic observations made with the ESA Observatory Herschel. This project collates, curates, homogenises, and creates derived data products for most of the premium multi-wavelength extragalactic data sets. The sky boundaries for the first data release (DR1) cover 1270 deg2 defined by the Herschel SPIRE extragalactic survey fields; notably the Herschel Multi-tiered Extragalactic Survey (HerMES) and the Herschel Atlas survey (H-ATLAS), Herschel Guaranteed and Open Time Key Programmes, respectively.

The 23 HELP fields are described in the following table:

Herschel Extragalactic Legacy Programme fields

Name

R.A. (deg)

Dec (deg)

Area (deg2)

Records Main Catalogue

SED fit objects
AKARI-NEP 270 66.6 9.2 531,746 1,239
AKARI-SEP 70.8 −53.9 8.7 844,172 566
Bootes 218.1 34.2 11.4 3,481,661 38,980
CDFS-SWIRE 53.1 −28.2 13 2,171,051 9,308
COSMOS 150.1 2.2 5.1 2,599,374 15,747
EGS 215 52.7 3.6 1,412,613 4,159
ELAIS-N1 242.9 55.1 13.5 4,026,292 49,986
ELAIS-N2 249.2 41.1 9.2 1,783,240 6,798
ELAIS-S1 8.8 −43.6 9 1,655,564 25,393
GAMA-09 134.7 0.5 62 12,937,982 130,293
GAMA-12 179.8 −0.5 62.7 12,369,415 108,139
GAMA-15 217.6 0.5 61.7 14,232,880 159,022
HDF-N 189.2 62.2 0.67 130,679 1,483
Herschel-Stripe-82 14.3 0 363.4 50,196,455 250,644
Lockman-SWIRE 161.2 58.1 22.4 4,366,298 46,719
HATLAS-NGP 199.5 29.2 177.7 6,759,591 185,290
SA13 198 42.7 0.27 9,799 120
HATLAS-SGP 1.5 −32.7 294.6 29,790,690 352,804
SPIRE-NEP 265 69 0.6 2,674 71
SSDF −8.1 −55.1 110.4 12,661,903 305,576
xFLS 259 59.4 7.4 977,148 5,944
XMM–13hr 203.6 37.9 0.76 38,629 670
XMM–LSS 35.1 −4.5 21.8 8,705,837 61,892

 

This new data set includes far-infrared photometry, photometric redshifts, and derived physical properties estimated from modelling the spectral energy distributions over the full HELP sky. The most relevant highly processed data products from HELP have been included as part of the ESASky TAP-based Legacy Archive, namely the catalogues with a total of 172 million photometric measurements from optical to far-infrared (herschelhelp_XXX) with a master table (herschelhelp) that includes the links and datalinks to the best fit SEDs provided by the CIGALE tool, the global catalogue of blind sources from Matched Filtered (MF) SPIRE maps (spire_blind_matched), and the HiPS SPIRE RGB map that may be inspected via ESASky linked via the url http://skies.esac.esa.int/Herschel/help_spire_rgb/.

Shirley et al. 2021 is the publication that presents the Herschel Extragalactic Legacy Project (HELP) Data Release 1 (DR1) and details the pipelines and methods used to tackle the challenges of complexity and volume size inherent to collating large, deep heterogeneous survey data.

HELP is designed to create a framework for wide-area multi-wavelength studies that can be continuously updated with new observations. The scope for Data Release 1, DR1, is to curate object catalogues and photometry at near-IR and optical wavelengths that have been provided by the survey teams from images at mid to far-IR wavelengths alongside spectroscopic redshifts. To that extent, HELP has various example Jupyter Notebooks that may be adapted to learn about the exploitation of these data sets in combination with other ESASky data sets.