Radio observations of NGC 2808 and other globular clusters: constraints on intermediate-mass black holes
Radio observations of NGC 2808 and other globular clusters: constraints on intermediate-mass black holes
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-? relation. This result is interpreted in terms of the fundamental differences between galaxies and globular clusters.
accretion, accretion discs, stellar dynamics, globular clusters: general, globular clusters: individual: NGC 2808, radio continuum: general
379-384
Maccarone, Thomas J.
27e6101c-8fa4-41db-ba75-d2ee3d1a0c53
Servillat, Mathieu
78700dd4-70a4-4a50-afd5-199db816f58a
18 August 2008
Maccarone, Thomas J.
27e6101c-8fa4-41db-ba75-d2ee3d1a0c53
Servillat, Mathieu
78700dd4-70a4-4a50-afd5-199db816f58a
Maccarone, Thomas J. and Servillat, Mathieu
(2008)
Radio observations of NGC 2808 and other globular clusters: constraints on intermediate-mass black holes.
Monthly Notices of the Royal Astronomical Society, 389 (1), .
(doi:10.1111/j.1365-2966.2008.13577.x).
Abstract
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-? relation. This result is interpreted in terms of the fundamental differences between galaxies and globular clusters.
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Accepted/In Press date: 12 June 2008
Published date: 18 August 2008
Keywords:
accretion, accretion discs, stellar dynamics, globular clusters: general, globular clusters: individual: NGC 2808, radio continuum: general
Identifiers
Local EPrints ID: 79559
URI: http://eprints.soton.ac.uk/id/eprint/79559
ISSN: 1365-2966
PURE UUID: 75c226e1-1513-410f-804f-5e390a362696
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Date deposited: 17 Mar 2010
Last modified: 14 Mar 2024 00:31
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Author:
Thomas J. Maccarone
Author:
Mathieu Servillat
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