Computer Science
Scientific paper
May 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1010..122m&link_type=abstract
A POPULATION EXPLOSION: The Nature & Evolution of X-ray Binaries in Diverse Environments. AIP Conference Proceedings, Volume 10
Computer Science
X-Ray Sources, X-Ray Bursts, Galactic Center, Bar, Circumnuclear Matter, And Bulge, Photometric, Polarimetric, And Spectroscopic Instrumentation, X-Ray Binaries
Scientific paper
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.
Bauer Franz Erik
Mauerhan Jon Christian
Morris Mark R.
Muno Michael P.
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