[1203.6685] Binary Disruption by Massive Black Holes: Hypervelocity Stars, S Stars, and Tidal Disruption Events

Authors: Benjamin C. Bromley (1), Scott J. Kenyon (2), Margaret J. Geller (2), Warren R. Brown (2) ((1) University of Utah (2) Smithsonian Astrophysical Observatory)

Date: 29 Mar 2012

Abstract: We examine whether disrupted binary stars can fuel black hole growth. In this mechanism, tidal disruption produces a single hypervelocity star (HVS) ejected at high velocity and a former companion star bound to the black hole. After a cluster of bound stars forms, orbital diffusion allows the black hole to accrete stars by tidal disruption at a rate comparable to the capture rate. In the Milky Way, HVSs and the S star cluster imply similar rates of 10ˆ{-5}--10ˆ{-3} yrˆ{-1} for binary disruption. These rates are consistent with estimates for the tidal disruption rate in nearby galaxies and imply significant black hole growth from disrupted binaries on 10 Gyr time scales.

abs pdf

Apr 01, 2012

1203.6685 (/preprints)
2012-04-01, 23:03 [edit]


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