Chandra Observations of X-ray Sources in Globular Clusters

Astronomy and Astrophysics – Astronomy

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Scientific paper

The Chandra X-ray Observatory's exquisite resolution has allowed spectacular advances in our understanding of X-ray sources in globular clusters, discovering hundreds of new cluster X-ray sources. I will review the principal observational results from Chandra observations of globular clusters, which have benefited from synergy with the Hubble Space Telescope. Chandra's subarcsecond astrometry has allowed firm optical identifications of low-mass X-ray binaries, cataclysmic variables, millisecond radio pulsars, quiescent low-mass X-ray binaries, and chromospherically active main-sequence binaries. These Chandra results have confirmed that quiescent low-mass X-ray binaries and the majority of cataclysmic variables are formed through dynamical processes, rather than from primordial binaries with the same components. They have also shed light on the evolutionary connections between low-mass X-ray binaries and millisecond radio pulsars, resolving a birthrate discrepancy problem and identifying objects which appear to be in a transitional phase from accreting X-ray binary to millisecond radio pulsar.

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