TY - JOUR
T1 - Radio observations of NGC 2808 and other globular clusters
T2 - Constraints on intermediate-mass black holes
AU - MacCarone, Thomas J.
AU - Servillat, Mathieu
PY - 2008/9
Y1 - 2008/9
N2 - 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.
AB - 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.
KW - Accretion, accretion discs
KW - Globular clusters: general
KW - Globular clusters: individual: NGC 2808
KW - Radio continuum: general
KW - Stellar dynamics
UR - http://www.scopus.com/inward/record.url?scp=49549119970&partnerID=8YFLogxK
U2 - 10.1111/j.1365-2966.2008.13577.x
DO - 10.1111/j.1365-2966.2008.13577.x
M3 - Article
AN - SCOPUS:49549119970
SN - 0035-8711
VL - 389
SP - 379
EP - 384
JO - Monthly Notices of the Royal Astronomical Society
JF - Monthly Notices of the Royal Astronomical Society
IS - 1
ER -