Initial Results of a Comprehensive Ultrasoft Survey of the Einstein IPC Database: Source List and Confirmation of the Selection Procedure

Details Initial Results of a Comprehensive Ultrasoft Survey of the Einstein IPC Database: Source List and Confirmation of the Selection Procedure Initial Results of a Comprehensive Ultrasoft Survey of the Einstein IPC Database: Source List and Confirmation of the Selection Procedure

Jun 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aj....115.2587t&link_type=abstract

The Astronomical Journal, Volume 115, Issue 6, pp. 2587-2593.

Astronomy and Astrophysics

Astronomy

8

Stars: Binaries: Close, Stars: Pulsars: General, Surveys, Stars: White Dwarfs, X-Rays

Scientific paper

We have carried out a survey of the entire Einstein IPC database (a total of 5934 sources) to select objects with strong components of ultrasoft X-ray emission (i.e., emission below 0.5 keV). The selection criteria are based on ratios of counts within three broad energy bands (i.e., X-ray ``colors''). A total of 516 objects have been selected, with 202 (39%) having been identified through correlations with other databases. Of the currently identified objects, 45% are active galactic nuclei, 28% are stellar objects, 6% are ``normal'' galaxies and galaxy clusters, and the remaining 21% are ``nonstellar'' Galactic objects such as cataclysmic variables, pulsars, and white dwarfs. We present a discussion of the survey selection procedure, the list of selected sources, and discussions of interesting objects from the aforementioned groups. We discuss the remarkable success of our rather ``low resolution'' method of estimating spectral shape and present plans for follow-up studies of the as yet unidentified sources.

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