The XMM Deep Survey in the CDF-S VII. UV catalogue of the Optical
  Monitor observations
  The XMM-Newton X-ray observatory has repeatedly observed the CDFS in 33
epochs (2001-2010) through the XMM-CDFS Deep Survey. During the X-ray
observations, XMM-OM targeted the central 17x17 arcmin2 region of the X-ray
field of view, providing simultaneous optical/UV coverage of the CDFS. The
resulting set of data can be used to build an XMM-OM catalogue of the CDFS,
filling the UV spectral coverage between the optical surveys and GALEX
observations. We present the UV catalogue of the XMM-CDFS Deep Survey. Its main
purpose is to provide complementary UV average photometric measurements of
known optical/UV sources in the CDFS, taking advantage of the unique
characteristics of the survey. The data reduction is also intended to improve
the standard source detection on individual observations, by cataloguing faint
sources by stacking their exposure images. We reprocessed the XMM-OM data of
the survey and stacked the exposures from consecutive observations using the
standard SAS tools to process the data obtained during single observations.
Average measurements of detections with SAS good quality flags from individual
observations and from stacked images were joined to compile the catalogue.
Sources were validated through the cross-identification within the EIS and
COMBO-17 surveys. Photometric data of 1129 CDFS sources are provided in the
catalogue, and optical/UV/X-ray photometric and spectroscopic information from
other surveys are also included. The stacking extends the detection limits by
~1 mag in the three UV bands, contributing 30% of the catalogued UV sources.
The comparison with the available measurements in similar spectral bands
confirms the validity of the XMM-OM calibration. The combined COMBO-17/X-ray
classification of the "intermediate" sources (e.g. optically diluted and/or
X-ray absorbed AGN) is also discussed.
