The nature of Ultra-luminous X-ray sources in early-type galaxies

Details The nature of Ultra-luminous X-ray sources in early-type galaxies The nature of Ultra-luminous X-ray sources in early-type galaxies

Oct 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aipc.1053..111r&link_type=abstract

OBSERVATIONAL EVIDENCE FOR BLACK HOLES IN THE UNIVERSE: Proceedings of the 2nd Kolkata Conference on Observational Evidence for

Physics

3

X-Ray Binaries, Quasars, Active Or Peculiar Galaxies, Objects, And Systems, Stellar Content And Populations, Radii, Morphology And Overall Structure, Binary And Multiple Stars

Scientific paper

Since ultraluminous X-ray sources are typically found in late-type systems, particularly in interacting or starburst galaxies, they are thought to be associated with young stellar populations. We find a significant population of ULXs in our sample of 94 nearby elliptical and lenticular galaxies, using the superior resolution of the Chandra X-ray observatory, far exceeding the number expected from background AGN. We show that though some of these ULXs are associated with young stellar populations in the cores of early-type galaxies, not all of the host galaxies show evidence of recent or ongoing star formation. We suggest that these ULXs come from a variety of sources, some being bright LMXBs, while some of them correspond to nuclei of recently accreted dwarf galaxies.

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