Cataclysmic Variables in Globular Clusters, the Galactic Center, and Local Space

Details Cataclysmic Variables in Globular Clusters, the Galactic Center, and Local Space Cataclysmic Variables in Globular Clusters, the Galactic Center, and Local Space

2008-01-08

arxiv.org/abs/0801.1279v2

AIP Conf.Proc.1010:136-142,2008

Astronomy and Astrophysics

Astrophysics

7 pages, 5 figures (in color; one bitmapped). Proceedings of "A Population Explosion: The Nature and Evolution of X-ray Binari

Scientific paper

10.1063/1.2945021

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 these source 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 6e22 /cm2 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.

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