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Massive Stellar X‐ray Sources in the Galactic Center

Mauerhan, Jon C. and Muno, Michael P. and Bauer, Franz E. and Morris, Mark R. (2008) Massive Stellar X‐ray Sources in the Galactic Center. In: A population explosion : the nature & evolution of x-ray binaries in diverse environments : St. Pete Beach, Florida, 28 October-2 November 2007. AIP Conference Proceedings. No.1010. American Institute of Physics , Melville, NY, pp. 122-126. ISBN 9780735405301.

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We present results of a spectroscopic survey of bright near-infrared counterparts to X-ray point sources from a deep Chandra survey of the Galactic nuclear bulge. K-band spectroscopy has revealed 13 new Wolf-Rayet and O-supergiant counterparts to Chandra soucres. Although they are systematically softer in X-rays than the general Galactic center source population of accretion powered CVs, their X-ray colors indicate a hard component consistent with emission from thermal plasma with kT>2 keV. Such hard X-ray emission is not ubiquitous among single Wolf-Rayet and O stars but is common among Wolf-Rayet+OB binaries with colliding supersonic winds. Although we regard colliding-wind binary hypothesis as the most likely scenario, it remains possible that several of these objects are wind-accreting neutron stars or black holes in supergiant high-mass X-ray binaries, or extraordinary single stars emitting hard X-rays.

Item Type:Book Section
Related URLs:
URLURL TypeDescription
Bauer, Franz E.0000-0002-8686-8737
Morris, Mark R.0000-0002-6753-2066
Additional Information:© 2008 American Institute of Physics. Issue Date: 23 May 2008.
Subject Keywords:accretion; black holes; Galactic centre; neutron stars; stellar spectra; stellar winds; supergiant stars; Wolf-Rayet stars; X-ray binary stars ; PACS: 98.70.Qy, 98.35.Jk, 95.55.Qf, 97.80.Jp.
Series Name:AIP Conference Proceedings
Issue or Number:1010
Record Number:CaltechAUTHORS:20090526-083058706
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:14294
Deposited By: Tony Diaz
Deposited On:28 Aug 2009 23:03
Last Modified:15 Nov 2022 21:55

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