SIMBAD references

1998AJ....115.2587T - Astron. J., 115, 2587-2593 (1998/June-0)

Initial results of a comprehensive ultrasoft survey of the Einstein IPC database: source list and confirmation of the selection procedure.

THOMPSON R.J., SHELTON R.G. and ARNING C.A.

Abstract (from CDS):

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.

Abstract Copyright:

Journal keyword(s): Stars: Binaries: Close - Stars: Pulsars: General - Surveys - Stars: White Dwarfs - X-Rays

VizieR on-line data: <Available at CDS (J/AJ/115/2587): table1.dat table2.dat>

Nomenclature: Tables 1 et 2: [TSA98] JHHMMSS.ss+DDMMSS.ss N=516.

CDS comments: Tables 1 et 2: Numbering 'NNNN N' is not used in SIMBAD.

Simbad objects: 532

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