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Cataclysmic variables in globular clusters, the galactic center, and local space

Heinke, Craig O. and Ruiter, Ashley J. and Muno, Michael P. and Belczynski, Krzysztof (2008) Cataclysmic variables in globular clusters, the galactic center, and local space. In: A population explosion: the nature & evolution of x-ray binaries in diverse environments. AIP Conference Proceedings. No.1010. American Institute of Physics , Melville, NY, pp. 136-142. ISBN 978-0-7354-1174-6.

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We compare the X-ray spectra and luminosities, in the 2-8 keV band, of known and suspected cataclysmic variables (CVs) in different environments, assessing the nature of thesesource populations. These objects include nearby CVs observed with ASCA; the Galactic Center X-ray source population identified by Muno et al.; and likely CVs identified in globular clusters. Both of the latter have been suggested to be dominated by magnetic CVs. We find that the brighter objects in both categories are likely to be magnetic CVs, but that the fainter objects are likely to include a substantial contribution from normal CVs. The strangely hard spectra observed from the Galactic Center sources reflect the high and variable extinction, which is significantly greater than the canonical 6×10^(22) cm^(−2) over much of the region, and the magnetic nature of many of the brightest CVs. The total numbers of faint Galactic Center sources are compatible with expectations of the numbers of CVs in this field.

Item Type:Book Section
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Heinke, Craig O.0000-0003-3944-6109
Additional Information:©2008 American Institute of Physics. We thank R. E. Taam and Koji Mukai for useful conversations. COH has been supported by the Lindheimer Fellowship at Northwestern University, and Chandra grant G07-8078X at the Univ. of Virginia while doing this work. MPM has been supported by a Hubble Fellowship, while KB has been supported by a Tombaugh Fellowship. AJR was supported by a Chandra Theory Grant and is thankful to the Dept. of Physics and Astronomy at Northwestern University for their hospitality. This publication makes use of data products from the Two Micron All Sky Survey, which is a joint project of the University of Massachusetts and the Infrared Processing and Analysis Center, funded by the National Aeronautics and Space Administration and the National Science Foundation.
Group:Infrared Processing and Analysis Center (IPAC)
Funding AgencyGrant Number
Tombaugh FellowshipUNSPECIFIED
Northwestern UniversityUNSPECIFIED
Subject Keywords:globular star clusters; Galactic centre; X-ray spectra; X-ray sources (astronomical)
Series Name:AIP Conference Proceedings
Issue or Number:1010
Record Number:CaltechAUTHORS:HEIaipcp08
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Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:13565
Deposited By: Ruth Sustaita
Deposited On:16 Jun 2009 18:26
Last Modified:08 Nov 2021 22:38

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