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No Evidence for Intermediate-Mass Black Holes in Globular Clusters: Strong Constraints from the JVLA

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arxiv 1203.6352 v1 pith:2WOQERZR submitted 2012-03-28 astro-ph.HE astro-ph.COastro-ph.GA

No Evidence for Intermediate-Mass Black Holes in Globular Clusters: Strong Constraints from the JVLA

Jay Strader , Laura Chomiuk , Thomas Maccarone , James Miller-Jones , Anil Seth , Craig Heinke , Gregory Sivakoff This is my paper
classification astro-ph.HE astro-ph.COastro-ph.GA
keywords clustersglobularimbhsblackholesintermediate-masslimitsaccrete
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With a goal of searching for accreting intermediate-mass black holes (IMBHs), we report the results of ultra-deep Jansky VLA radio continuum observations of the cores of three Galactic globular clusters: M15, M19, and M22. We reach rms noise levels of 1.5-2.1 uJy/beam at an average frequency of 6 GHz. No sources are observed at the center of any of the clusters. For a conservative set of assumptions about the properties of the accretion, we set 3-sigma upper limits on IMBHs from 360-980 M_sun. These limits are among the most stringent obtained for any globular cluster. They add to a growing body of work that suggests either (a) IMBHs ~> 1000 M_sun are rare in globular clusters, or (b) when present, IMBHs accrete in an extraordinarily inefficient manner.

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