The XMM-LSS survey. The XMDS/VVDS 4σ catalogue
Abstract
We present a first catalogue of X-ray sources resulting from the central area of the XMM-LSS (Large Scale Structure survey). We describe the reduction procedures and the database tools we developed and used to derive a well defined catalogue of X-ray sources. The present catalogue is limited to a sub-sample of 286 sources detected at 4 σ in the 1 deg2 area covered by the photometric VVDS (VIRMOS VLT Deep Survey), which allows us to provide optical and radio identifications. We also discuss the X-ray properties of a larger X-ray sample of 536 sources detected at >4 σ in the full 3 deg2 area of the XMM Medium Deep Survey (XMDS) independently of the optical identification. We also derive the log N - log S relationship for a sample of more than one thousand sources that we discuss in the context of other surveys at similar fluxes.
- Publication:
-
Astronomy and Astrophysics
- Pub Date:
- August 2005
- DOI:
- 10.1051/0004-6361:20042583
- arXiv:
- arXiv:astro-ph/0505117
- Bibcode:
- 2005A&A...439..413C
- Keywords:
-
- X-ray: general;
- surveys;
- quasars: general;
- catalogs;
- Astrophysics
- E-Print:
- 15+6 pages, 12 figures, accepted for publication in Astronomy &