No evidence for intermediate-mass black holes in globular clusters: Strong constraints from the JVLA
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With a goal of searching for accreting intermediate-mass black holes (IMBHs), we report the results of ultra-deep Jansky Very Large Array 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 μJy beam−1 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 3σ upper limits on IMBHs from 360 to 980 M☉ . These limits are among the most stringent obtained for any globular cluster. They add to a growing body of work that suggests either (1) IMBHs >~ 1000 M☉ are rare in globular clusters or (2) when present, IMBHs accrete in an extraordinarily inefficient manner.
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Kirsten, Franz; Vlemmings, W. (2012)Intermediate mass black holes (IMBHs) with expected masses M• ≈ 104 M☉ are thought to bridge the gap between stellar mass black holes (M• ≈ 3 − 100 M☉) and supermassive black holes found at the centre of galaxies (M• > ...
Wrobel, J.; Miller-Jones, James; Middleton, M. (2016)Nantais et al. used the Hubble Space Telescope to localize probable globular clusters (GCs) in M81, a spiral galaxy at a distance of 3.63 Mpc. Theory predicts that GCs can host intermediate-mass black holes (IMBHs) with ...
Kirsten, Franz; Vlemmings, W.; Freire, P.; Kramer, M.; Rottmann, H.; Campbell, R. (2014)The globular cluster (GC) M15 (NGC 7078) is host to at least eight pulsars and two low mass X-ray binaries (LMXBs), one of which is also visible in the radio regime. Here we present the results of a multi-epoch global ...