The XMM-LSS survey: The XMDS/VVDS 4 sigma catalogue

TL;DR

This paper presents a catalog of X-ray sources from the XMM-LSS survey, detailing data reduction, source detection, and optical/radio identification, along with analysis of source properties and flux distribution.

Contribution

It provides the first well-defined X-ray source catalog for the XMM-LSS survey area, including data processing procedures and multi-wavelength identification methods.

Findings

Catalog of 286 sources at 4 sigma in 1 deg^2 with optical/radio IDs

Extended catalog of 536 sources in 3 deg^2 with X-ray properties

Derived logN-logS relationship for over 1000 sources

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 sigma in the 1 deg^2 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 sigma in the full 3 deg^2 area of the XMM Medium Deep Survey (XMDS) independently of the optical identification. We also derive the logN-logS relationship for a sample of more than one thousand sources that we discuss in the context of other surveys at similar fluxes.