A Comprehensive Ultra-Soft Survey of the Einstein IPC Database: Initial Results

Details A Comprehensive Ultra-Soft Survey of the Einstein IPC Database: Initial Results A Comprehensive Ultra-Soft Survey of the Einstein IPC Database: Initial Results

Dec 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996aas...189.0901t&link_type=abstract

American Astronomical Society, 189th AAS Meeting, #09.01; Bulletin of the American Astronomical Society, Vol. 28, p.1284

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We have carried out a survey of the entire Einstein IPC database (a total of 5934 sources) to select objects with strong components of ultra-soft X-ray emission (i.e., emission below 0.5 keV). The selection criteria are based on ratios of X-ray ``colors" and the analysis utilized the reprocessed IPC CDROM data. A total of 516 objects have been selected, with 185 (36%) having been identified using the SIMBAD database. Of the currently identified objects, 47% are AGN, 33% are stellar objects, 4% are ``normal" galaxies and galactic clusters, and the remaining 16% are ``non-stellar" galactic objects such as LMXBs, white dwarfs, and pulsars. We present the identified sources and population statistics for the above-mentioned groups of objects, along with discussions of interesting unidentified objects and our future plans for the survey.

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