Globular Cluster X-ray Binaries

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Quiescent/Low-Luminosity X-Ray Binaries

Scientific paper

Globular clusters are a favored environment of X-ray binaries, with formation rates per unit mass exceeding those in the Galactic disk by orders of magnitude. There is now a wealth of Chandra data on globular clusters, revealing hundreds of low-luminosity X-ray sources, most of which are either quiescent low-mass X-ray binaries, cataclysmic variables, or millisecond pulsars. There are also thirteen bright X-ray sources known in globular clusters, but the focus of my presentation will be on the more numerous population of dim sources. In addition to their important role in globular cluster evolution, these sources can also be studied for what they are, namely, X-ray binaries. Globular cluster X-ray binaries have the advantages of accurately known distances and numerous other sources in the field for comparison. From neutron star radius measurements to the L_x vs E-dot relation for millisecond pulsars, I will discuss how the data are presently being used (with the hope of sparking new ideas) and summarize the current state of affairs.

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