Journal Article

Radio observations of NGC 2808 and other globular clusters: constraints on intermediate-mass black holes

Thomas J. Maccarone and Mathieu Servillat

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 389, issue 1, pages 379-384
Published in print September 2008 | ISSN: 0035-8711
Published online August 2008 | e-ISSN: 1365-2966 | DOI: http://dx.doi.org/10.1111/j.1365-2966.2008.13577.x
Radio observations of NGC 2808 and other globular clusters: constraints on intermediate-mass black holes

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We present the results of a deep radio observation of the globular cluster NGC 2808. We show that there are no sources detected within the core of the cluster, placing constraints on both the pulsar population of the cluster and the mass of a possible intermediate-mass black hole in NGC 2808. We compare the results for this cluster with other constraints on intermediate-mass black holes derived from accretion measures. With the exception of G1 in M 31 which has previously shown radio emission, even with considerably more conservative assumptions, only the clusters with the poorest of observational constraints are consistent with falling on the MBH–σ relation. This result is interpreted in terms of the fundamental differences between galaxies and globular clusters.

Keywords: accretion, accretion discs; stellar dynamics; globular clusters: general; globular clusters: individual: NGC 2808; radio continuum: general

Journal Article.  5123 words. 

Subjects: Astronomy and Astrophysics

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