Shedding Light on the Obscured Population of Galactic HMXBs

Details Shedding Light on the Obscured Population of Galactic HMXBs Shedding Light on the Obscured Population of Galactic HMXBs

Feb 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010head...11.0106b&link_type=abstract

American Astronomical Society, HEAD meeting #11, #1.06; Bulletin of the American Astronomical Society, Vol. 41, p.653

Astronomy and Astrophysics

Astronomy

1

Scientific paper

Galactic surveys in the soft gamma-ray domain (15-100 keV) by INTEGRAL have revealed a hidden population of obscured HMXBs with supergiant companions (SGXBs). In less than a decade, the number of SGXBs has tripled enabling us to perform more reliable statistical analyses on this poorly-understood class of high-energy emitters. We examine the parameter space defined by the 3 known groups of HMXBs: SGXBs, Supergiant Fast X-ray Transients (SFXTs), and HMXBs with B-emission line companions (BEXBs). We present new diagnostic tools, akin to the "Corbet diagram," in which HMXBs tend to segregate based on their dominant accretion mechanisms. These tools are used to study the relation between material local to the source and the observed periodic modulations. Finally, we update and revisit the population of HMXBs as tracers of recent massive stellar formation and galactic evolution, in particular for sources in the direction of the inner galactic spiral arms.

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