Deep survey of the AXAF Ultra Deep Field

GT A deep XMM pointing will be obtained for the AXAF Ultra Deep Field southerncounterpart of the Lockman Hole.The XMM observations will provide spectroscopicinformation of faintsources complementary to the spatial information given byAXAF data. In about 400 ksec, detailed spectral analysis will be achievable forsources with 10**4 counts or a flux of 1.5* and 3*10(14) erg/cm**2 sec in the0.22kev and 210keV bands respectively, well above source confusion. From ROSATDeep Surveys, one expects about 15 extragalactic sources for which detailed spectral analysis can be carried spectroscopic information. Combining the AXAFand XMM data will give firm limits out and up to about 120 sources with coarseon XMM source confusion and help to determine the fluctuations of the Xray BG. truncated!, Please see actual data for full text [truncated!, Please see actual data for full text]