AAS 202nd Meeting, May 2003
Session 25 Surveys and Catalogs
Poster, Tuesday, May 27, 2003, 10:00am-6:30pm, West Exhbit Hall

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[25.02] Astrophysics with ClassX: Candidate Stars and Extragalactic Objects from ROSAT pointed observations

A.A. Suchkov, R.J. Hanisch, R.L White, M. Postman, M.E. Donahue (STScI), T.A. McGlynn, E.L. Winter, L. Angelini, M.F. Corcoran, S.A. Drake, D. Pence, N. White (NASA/GSFC), F. Genova ( CDS), F. Ochsenbein, P. Fernique, S. Derriere (CDS), W. Voges (MPE)

We report on previously unclassified X-ray sources from Rosat pointed observations (the WGA catalog) that were identified by the ClassX classifiers either as stars of different spectral types or galaxies or quasars. The data included optical and infrared information along with the X-ray data for all sources.

Source flux information combined with that from the source sky distribution was used to infer association of star candidates with stellar X-ray emitters of different types, such as PMS stars, normal young ZAMS and post-ZAMS stars, and old strong X-ray emitters among F stars. Numerous candidates of all three types of emitters were found and compared with similar objects known before. Properties of stellar X-ray emitters at faint Rosat magnitudes were tentatively summarized.

The candidate extragalactic objects were also found to be on average fainter than the known populations. The new QSO candidates are especially interesting because their faint magnitudes suggest a possibility of extreme distances (redshifts). The most reliable candidates were isolated using ClassX classification probabilities, and their properties in different wavelength bands examined. Preliminary conclusions on the difference between the newly identified populations and a brighter on average respective populations of known objects were made.

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Bulletin of the American Astronomical Society, 35 #3
© 2003. The American Astronomical Soceity.