Black Holes in Globular Clusters

Details Black Holes in Globular Clusters Black Holes in Globular Clusters

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.0112m&link_type=abstract

American Astronomical Society, HEAD meeting #10, #1.12

Astronomy and Astrophysics

Astronomy

Scientific paper

For approximately 30 years, there has been strong theoretical debate over whether globular clusters would be able to retain black holes, with most numerical work suggesting that dense clusters would be rather efficient in ejecting black holes. Early Chandra observations of extragalactic clusters have revealed objects too bright to be single neutron stars, but have lacked the angular resolution needed, at these distances, to prove that the emission from these clusters comes from a single source, rather than a superposition of bright neutron stars. Our recent discovery of strong variability from XMMU J122939.7+075333, an ultraluminous X-ray source in a spectroscopically confirmed globular cluster, proves that globular clusters can contain black holes. We discuss this source's unusual X-ray spectral and variability properties, and the strong [O III] line emission in its optical spectrum in terms of stellar mass and intermediate mass black hole models. We discuss the prospects for additional discoveries of black holes in globular clusters.

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