The Brightest Serendipitous X-ray Sources in the ChaMPlane Survey

Details The Brightest Serendipitous X-ray Sources in the ChaMPlane Survey The Brightest Serendipitous X-ray Sources in the ChaMPlane Survey

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...211.0312p&link_type=abstract

American Astronomical Society, AAS Meeting #211, #03.12; Bulletin of the American Astronomical Society, Vol. 39, p.725

Astronomy and Astrophysics

Astronomy

Scientific paper

The Chandra Multiwavelength Plane (ChaMPlane) Survey is a comprehensive effort to constrain the field population of accretion-powered and coronal low-luminosity X-ray sources (LX < 1033 erg s-1) in the Galaxy. ChaMPlane incorporates archival and targeted data from deep (> 20ks) Chandra observations, optical imaging in V, R, I, and Hα down to R 24, and follow-up optical spectroscopy for source classification. We present the results of a population study of the brightest serendipitous ChaMPlane X-ray sources. We use X-ray spectral fitting, X-ray lightcurve analysis, and optical photometry of candidate counterparts to determine the properties of 21 sources. Our sample includes a previously unreported candidate quiescent low-mass X-ray binary or cataclysmic variable, one flare star, and nine stellar sources. We find that quantile analysis, a new technique developed for constraining the X-ray spectral properties of low-count sources, is largely consistent with spectral fitting. Further discoveries of accretion-powered sources will place limits on their poorly constrained number densities. Examining how these densities change as a function of environment will allow us to better understand the role of environment in stellar evolution.

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