RASS2RXS Catalog
This database table contains the Second ROSAT All-Sky Survey Point Source
Catalog (2RXS). This is the second publicly released ROSAT catalog of
point-like sources obtained from the ROSAT All-Sky Survey (RASS) observations
performed with the Position-Sensitive Proportional Counter (PSPC) between
June 1990 and August 1991. It is an extended, revised, and combined version
of the RASS Bright and
Faint Source Catalogs. Utilizing the latest
RASS processing, this catalog includes more than 135,000 X-ray detections in
the 0.1-2.4 keV energy band down to a likelihood threshold of 6.5.
Additional information can be found at http://www.mpe.mpg.de/ROSAT/2RXS/.
RASSBSC Catalog
The ROSAT All-Sky Survey Bright Source Catalog (RASS-BSC, revision 1RXS) was
released online at http://www.xray.mpe.mpg.de/rosat/survey/rass-bsc/ (cf. IAU
Circular No. 6420, June 19, 1996). It has been superseded by the
Second ROSAT All-Sky Survey Point Source Catalog (2RXS).
This catalog was derived from the all-sky survey performed during the first
half year of the ROSAT mission in 1990-1991; 18,811 sources are catalogued,
with a limiting ROSAT PSPC countrate of 0.05 cts/s in the energy band 0.1-
2.4 keV. The sources have a detection likelihood of at least 15 and contain
at least 15 source photons. At a brightness limit of 0.1 cts/s (8547 sources),
the catalog represents a sky coverage of 92 percent.
The ROSAT name, the position in equatorial coordinates, the positional error,
the source countrate and error, the background countrate, exposure time,
hardness-ratios HR1 and HR2 and errors, extent and likelihood of extent, and
likelihood of detection are provided for each source. For 94 percent of the
sources, visual inspection confirmed the results of the standard processing
with respect to existence and position; the remaining 6 percent were
reanalyzed and appropriately flagged. Broadband images are available for a
subset of the flagged sources.
RASSFSC Catalog
The ROSAT All-Sky Survey Faint Source Catalog (RASS-FSC)
was first released by the Max-Planck-Institut fuer extraterrestrische Physik,
Garching group (voges et al. 2000) in May 2000. It is derived from the
All-Sky Survey performed during the ROSAT mission using the Position-Sensitive
Proportional Counter (PSPC) in the energy range 0.1 to 2.4 keV. Over
one hundred thousand (105,924 to be exact) sources are catalogued herein,
representing the faint extension of the RASS Bright Source Catalog (RASS-BSC,
cf. IAU Circular 6420 and Voges et al. 1999, A&A, 349, 389: this is also
available at the HEASARC as the RASSBSC database). The sources in this
catalog have a detection likelihood of at least seven, and contain at least
six source photons. The likelihood L of source detection is defined as
L = -ln (1 - P), where P = the probability of source detection.
For each source, the ROSAT name, position and positional error, the source
count rate and error, the background count rate, the exposure time,
the date of observation, two hardness ratios and their associated errors,
the source extent and the extent likelihood, and the likelihood of
source detection are given, inter alia.
