XMM-Newton-NEWS  #231,    04-Jun-2020

XMM-Newton Science Operations Centre at
ESA's European Space Astronomy Centre,
P.O. Box - Apdo. 78, 28691 Villanueva de la Cañada, Madrid, Spain
SOC Home Page: http://www.cosmos.esa.int/web/xmm-newton/
Helpdesk web interface: http://www.cosmos.esa.int/web/xmm-newton/xmm-newton-helpdesk
Helpdesk email address: xmmhelp@sciops.esa.int
News Mailing List: http://www.cosmos.esa.int/web/xmm-newton/newsletter


  • XSA v12.2 release with access to 4XMM-DR9 spectral energy distributions
  • XMM-Newton 20th Anniversary web pages
  • Update your bookmarks


The new version of the XMM-Newton Science Archive, XSA v12.2, is available at


This version provides access to the 4XMM-DR9 Spectral Energy Distribution (SED), SED FITS files and plots produced by the XMM-Newton Survey Science Centre.

Other new funcionalities are:

  • Links to the 4XMM-DR9 source information available at IRAP (http://xmm-catalog.irap.omp.eu/) and at XCAT-DB
  • Visualization of the PPS EPIC background time-series plots.
  • Visualization of EPIC images of moving targets in their reference frame.
  • An astroquery module that provides access to the XSA database (astroquery.esa.xmm_newton) has been created.


Spectral Energy Distributions (SEDs) have been produced by the Survey Science Centre (SSC). SEDs are provided for each of the unique and spatially unresolved 4XMM sources matching at least one of the archival catalogues queried. Whenever several combinations of UV to radio counterparts yield matching probabilities higher than 1%, up to three of the most likely combinations are produced.

The tools used are basically the same as those developed for the ARCHES project (Motch et al. 2017). The ARCHES algorithm (Pineau et al. 2017) cross-matches in a single pass all catalogues and, for each combination of catalogue entries, computes the cross-matching probability. Probabilities are derived from the likelihood that sources in the different catalogues have exactly the same position on the sky, considering their astrometric uncertainties.

Several combinations of catalogues were selected in different sky regions in order to optimize the depth of the photometry, the number of matches and the astrometric accuracy of the SEDs. The UV band was covered by Galex GR6+7 and XMM-OM-SUSS4.1. In the optical band, catalogues were prioritised in the following order, SDSS12, PanStarrs DR1 and Skymapper, so as to cover the entire sky, complemented with GAIA DR2 and APASS9. 2MASS, allWISE and AKARI cover the infrared wavelength range while possible matches with radio sources are extracted from the FIRST and NVSS catalogues.

More details are available in Webb et al. 2020:


Table 4 of Webb et al. 2020 lists the spatial overlap of 4XMM-DR9 with the largest multi-wavelength catalogues currently available at CDS.


The Web pages dedicated to the celebration of the 20 years in orbit of XMM-Newton have been updated with material from the XMM-Newton 20th Anniversary Special Event, that was held at ESAC on 10-11 December 2019.

On the XMM-Newton SOC event Web page


you can find details of the program as well as all the downloadable pdf and videos of the presentations.

On the celebration Web page


you can now find the official video of the event, a Virtual Reality room with XMM-Newton in 3D, illustrations and visual thinking representations of presenters and presentations, comics, material from the artwork exhibition and much more.

We will keep updating the celebration Web Pages with information, events and online material.


Due to changes in hardware and the associated operating system, the URLs of some of the XMM-Newton Web pages have been modified:


We would appreciate if you let us know via the HelpDesk in case you find problems with any other link.


Yours sincerely,

XMM-Newton SOC