The XMM deep survey in the CDF-S VIII. X-ray properties of the two
  brightest sources
  We present results from the deep XMM-Newton observations of the two brightest
X-ray sources in the Chandra Deep Field South (CDFS), PID 203 (z=0.544) and PID
319 (z=0.742). The long exposure of 2.5 Ms over a 10 year period (net 4 yr with
a 6 yr gap) makes it possible to obtain high quality X-ray spectra of these two
Type I AGN with X-ray luminosity of 10^44 erg/s, typical luminosity for
low-redshift PG quasars, track their X-ray variability both in flux and
spectral shape. Both sources showed X-ray flux variability of ~10-20 per cent
in rms which is similar in the soft (0.5-2 keV) and hard (2-7 keV) bands. PID
203, which has evidence for optical extinction, shows modest amount of
absorption (nH~1e21cm^-2) in the X-ray spectrum. Fe K emission is strongly
detected in both objects with EW~0.2 keV. The lines in both objects are
moderately broad and exhibit marginal evidence for variability in shape and
flux, indicating that the bulk of the line emission come from their accretion
disks rather than distant tori.
