J. P. Naiman et al 2009 ApJ 705 L153 doi:10.1088/0004-637X/705/2/L153
J. P. Naiman, Enrico Ramirez-Ruiz and Douglas N. C. Lin
Show affiliationsHere, we show that the overabundance of ultraluminous, compact X-ray sources associated with moderately young clusters in interacting galaxies such as the Antennae and the Cartwheel can be given an alternative explanation that does not involve the presence of intermediate mass black holes (IMBHs). We argue that gas density within these systems is enhanced by the collective potential of the cluster prior to being accreted onto the individual cluster members and, as a result, the aggregate X-ray luminosity arising from the neutron star cluster members can exceed > 1039 erg s-1. Various observational tests to distinguish between IMBHs and accreting neutron star cusps are discussed.
accretion, accretion disks; black hole physics; globular clusters: general; hydrodynamics
98.70.Qy X-ray sources; X-ray bursts
98.20.Jp Globular clusters in external galaxies
98.62.Mw Infall, accretion, and accretion disks
98.62.Js Galactic nuclei (including black holes), circumnuclear matter, and bulges
Issue 2 (2009 November 10)
Received 2009 May 29, accepted for publication 2009 October 5
Published 2009 October 21
J. P. Naiman et al 2009 ApJ 705 L153
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