Pre-publication release of Quasars.Org catalogue

Various updates, tidyups and small fixes have been done on the Master
radio/xray/optical overlays catalogue on ftp://quasars.org . It is
20Mb zipped, and displays 500,779 optical objects which are associated
to xray/radio detections or are known quasars. The optical objects
are sourced from the APM and USNO-A optical catalogues. Associations
presented a

ROSAT HRI: 13,240 optical associations out of 56,398 astrometrically
unique xray detections
ROSAT RASS: 30,711 / 124,730 xray
ROSAT PSPC: 30,233 / 102,005 xray
WGA (PSPC): 19,528 / 88,578 xray
FIRST: 155,181 / 781,667 radio, plus 11,531 double radio lobes.
NVSS: 242,870 / 1,810,664 radio, plus 8878 double lobes.
SUMSS: 27,593 / 134,865 radio, plus 1166 double lobes.

These associations yield 100,345 good quasar candidates, with
calculated percentage of being a QSO displayed for each object. Also
48,215 catalogued QSOs are displayed (regardless of radio or xray
detection) which are optically found on the APM and/or the USNO-A. On
this same site there is also the Free-Lunch catalogue which gives this
information concisely, plus a couple of subset catalogues. A readme
file is present, plus sample extract files for quick browsing.

The latest version of every radio/x-ray catalogue (excluding XMM1 and
ChaMP which have been used as a validation check) has been used in
this Quasars.org catalogue, which is near submission.

ftp://quasars.org

Eric Flesch
Wellington, New Zealand