Chandra survey of 13-h XMM/ROSAT survey

XMM-Newton will provide good-quality X-ray spectra for over 200 sources with fluxes around the knee of the logN/logS, which are responsible for the bulk of the X-ray background. The main aim of the Chandra observations is to provide arcsecond, or better, positions, and hence reliable identifications, for the XMM-Newton sources.

The ACIS-I observations were arranged in a mosaic of four 30-ks pointings, covering almost all of the 15-arcmin radius XMM-Newton/ROSAT field. We detect 214 Chandra sources above a Cash likelihood statistic of 25, which approximates to 5{sigma} significance, to a limiting flux of ~1.3x10^-15^erg/cm^2^/s (0.5-7keV). Optical counterparts are derived from a Subaru SuprimeCam image reaching to R~27.