Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 2007
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aspc..376..699m&link_type=abstract
Astronomical Data Analysis Software and Systems XVI ASP Conference Series, Vol. 376, proceedings of the conference held 15-18 Oc
Astronomy and Astrophysics
Astronomy
3
Scientific paper
The Survey Science Center (SSC) of the XMM-Newton satellite provides a public interface to the European Photon Imaging Counter (EPIC) source catalogs implementing cross-correlations between EPIC X-ray sources and archival astronomical catalogs. These cross-correlations are computed by the Archival Catalog Database Subsystem (ACDS), developed in Strasbourg, as part of the automatic pipeline processing. A first release of this database (the XCATDB) based on an obsolete OODBMS was made public with the 1st XMM-Newton catalog in 2003. A new system, based on Saada, will be made public at the time of the 2nd release of the catalog in late 2006. Saada is well-suited to host heterogeneous data and especially to manage persistent relationships. This last feature is used to implement in a static manner the correlations computed by the ACDS. The Saada query language (SaadaQL) can express very complex constraints and can select X-ray sources using conditions on the patterns formed by the correlation links. SaadaQL also supports constraints based on Unified Content Descriptors (UCDs) allowing selections on multiple catalogs. The demonstration includes a presentation of the XCATDB prototype and is focused on the SaadaQL features and the use of UCDs to handle heterogeneous datasets.
Michel Laurent
Motch Ch.
Pineau François-Xavier
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