Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21940705z&link_type=abstract
American Astronomical Society, AAS Meeting #219, #407.05
Other
Scientific paper
There are no known black hole X-ray sources in Galactic globular clusters. This could either be due to the small number of Galactic globular clusters combined with a very low formation rate or a very long duty cycle for globular cluster black hole X-ray sources, or a true absence of black holes in globular clusters. Advances in X-ray and optical observations have made it possible to extend the search for black hole X-ray sources to extragalactic globular clusters. In this way, several years ago we discovered this first unambiguous black hole in a globular cluster. ADAP supported studies have allowed us to find several more such black hole systems in extragalactic globular clusters, clearly showing such objects can be formed. They have also allowed us and others to carry out variability and spectroscopic studies in X-rays and the optical to characterize some of these systems. I will discuss the results of some of this work, including those for one of the best studied systems, RZ2109, which appears to require a stellar-mass black hole accreting near or above its Eddington luminosity from a white dwarf donor.
Kundu Anjan
Maccarone Thomas J.
Peacock Mark B.
Zepf Stephen E.
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