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BRIGHT SOURCE CATALOG OF THE ROSAT ALL SKY SURVEY AVAILABLE
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The ROSAT All-Sky Survey Bright Source Catalogue (RASS-BSC, revision 1RXS) has been released and is available through the World Wide Web via:
(cf. IAU Circular No. 6420, June 19, 1996). RASSBSC (ROSAT ALL-SKY-SURVEY BRIGHT-SOURCE-CATALOGUE)

This catalogue is 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 catalogue represents a sky coverage of 92 percent. For each source are provided 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. 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.

A list containing correlations with other catalogues and identifications will follow soon.

Questions or comments may be directed to survey@rosat.mpe-garching.mpg.de.


FIRST MAPS OF THE SOFT X-RAY DIFFUSE BACKGROUND (SXRB) FROM THE ROSAT XRT/PSPC ALL-SKY SURVEY AVAILABLE
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The first maps of the soft x-ray diffuse background (SXRB) from the ROSAT XRT/PSPC All-Sky Survey have been released and are available via: (cf. IAU Circular No. 6419, June 17, 1996).

A detailed description of the data and maps has appeared in: Snowden et al., Ap.J. 454, 643 (1995). The maps cover about 98 percent of the sky in the bands 0.25, 0.75, and 1.5 keV, with about 2-degree angular resolution and high sensitivity for low-surface-brightness, extended features. The effects of non-x-ray contamination and x- rays of solar-system origin have been eliminated to the greatest possible extent, but discrete x-ray sources have not been removed. The much-improved angular resolution, statistical precision, and completeness of coverage of these maps reveal considerable structure over the entire energy range 0.1-2.0 keV that was not observed previously. The data compare well with previous all-sky surveys in terms of absolute normalization and zero point. For each energy band, an intensity map, as well as an exposure map, is available in FITS format. All maps were constructed using a Hammer-Aitoff equal-area projection in zero-centered galactic coordinates with longitude increasing to the left.

Questions or comments may be directed to survey@rosat.mpe-garching.mpg.de.


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Curator: Michael Arida (SP Sys); arida@milkyway.gsfc.nasa.gov
HEASARC Guest Observer Facility


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This file was last modified on Friday, 08-Apr-2011 15:00:45 EDT

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