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GAS ACCRETION BY STAR CLUSTERS AND THE FORMATION OF ULTRALUMINOUS X-RAY SOURCES FROM CUSPS OF COMPACT REMNANTS

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J. P. Naiman, Enrico Ramirez-Ruiz and Douglas N. C. Lin

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Here, 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.


Keywords

accretion, accretion disks; black hole physics; globular clusters: general; hydrodynamics


PACS

98.70.Qy X-ray sources; X-ray bursts

97.60.Jd Neutron stars

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

Subjects

Astrophysics and astroparticles

Dates

Issue 2 (2009 November 10)

Received 2009 May 29, accepted for publication 2009 October 5

Published 2009 October 21



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