Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011aas...21712305z&link_type=abstract
American Astronomical Society, AAS Meeting #217, #123.05; Bulletin of the American Astronomical Society, Vol. 43, 2011
Astronomy and Astrophysics
Astronomy
Scientific paper
Whether there are black holes in globular clusters and what the properties of any such black holes might be remained unclear for many years. Advances in both X-ray and optical/near-infrared work have enabled searches for black hole X-ray sources to be extended to extragalactic globular clusters. We combined X-ray and optical observations to identify the first unambiguous black hole in a globular cluster in 2007. Through ADP supported work we have shown that this black hole is very likely to be a stellar mass and not an intermediate mass black hole. We have also used ADP supported archival studies and pointed observations to find two more globular cluster black hole X-ray sources, and two additional objects have been reported in the literature. We discuss these discoveries and their implications for the masses of black holes in globular clusters and for the formation of accreting black hole systems in dense stellar environments.
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