Transient X-ray Binaries in Early-Type Galaxies

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Scientific paper

In the Milky Way, soft X-ray transients are a class of low-mass X-ray binaries that are dominated by binaries whose compact object is a black hole. Although the X-ray binary populations in early-type galaxies appear to be dominated by more persistent sources, multi-epoch observations of nearby early-type galaxies in Chandra's first decade are finally beginning to reveal their transient X-ray binary population. In particular, the combination of proximity to Centaurus A, deep exposures from the Centaurus A Very Large Project, and more recent follow-up observations has allowed us to discover 9 X-ray binaries in Centaurus A that are clearly transient and may harbor black holes. We compare the behavior of transient X-ray binaries found in Centaurus A to that discovered by variability studies in three other early-type galaxies, NGC 1023, NGC 4365, and NGC 4697, as well as their Galactic brethren.

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