The XMM-LSS survey

The XMDS/VVDS 4σ catalogue

¹ INAF IASF, Sezione di Milano “G.Occhialini”, via Bassini 15, 20133 Milano, Italy e-mail: lucio@mi.iasf.cnr.it
² INAF Osservatorio di Brera, via Brera 28, 20121 Milano, Italy
³ Università degli Studi di Milano – Bicocca, Dipartimento di Fisica, Piazza della Scienza 3, 20126 Milano, Italy
⁴ CEA/DSM/DAPNIA Service d'Astrophysique, Saclay, 91191 Gif-sur-Yvette, France
⁵ Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août 17, 4000 Liège 1, Belgium
⁶ Laboratoire d'Astrophysique de Marseille, Traverse du Siphon, 13376 Marseille, France
⁷ Institut d'Astrophysique de Paris, 89bis bvd Arago, 75014 Paris, France
⁸ INAF Osservatorio di Capodimonte, via Moiariello 16, 80131 Napoli, Italy
⁹ INAF Osservatorio Astronomico di Torino, via Osservatorio 20, 10025 Pino Torinese, Italy

Received: 21 December 2004
Accepted: 26 April 2005

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  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 > in the full 3 deg² area of the XMM Medium Deep Survey (XMDS) independently of the optical identification. We also derive the relationship for a sample of more than one thousand sources that we discuss in the context of other surveys at similar fluxes.