Ultraluminous X-ray Sources as Intermediate Mass Black Holes Fed by Tidally Captured Stars

Details Ultraluminous X-ray Sources as Intermediate Mass Black Holes Fed by Tidally Captured Stars Ultraluminous X-ray Sources as Intermediate Mass Black Holes Fed by Tidally Captured Stars

2003-12-23

arxiv.org/abs/astro-ph/0312597v2

Astrophys.J. 604 (2004) L101-L104

Astronomy and Astrophysics

Astrophysics

Accepted version (ApJL), new figure, typos corrected

Scientific paper

10.1086/383616

The nature of ultraluminous X-ray sources (ULXs) is presently unknown. A possible explanation is that they are accreting intermediate mass black holes (IBHs) that are fed by Roche lobe overflow from a tidally captured stellar companion. We show that a star can circularize around an IBH without being destroyed by tidal heating (in contrast to the case of M_bh> 10^6 M_sun massive black holes in galactic centers, where survival is unlikely). We find that the capture and circularization rate is of the order of 5 \times 10^-8 yr^-1, almost independently of the cluster's relaxation time. We follow the luminosity evolution of the binary system during the main sequence Roche lobe overflow phase and show it can maintain ULX-like luminosities for >10 Myr. In particular, we show that the ULX in the young cluster MGG-11 in star-burst galaxy M82, which possibly harbors an IBH, is well explained by this mechanism, and we predict that \gtrsim 10% of similar clusters with IBHs have a tidally captured circularized star. The cluster can evaporate on a time-scale shorter than the lifetime of the binary. This raises the possibility of a ULX that outlives its host cluster, or even lights up only after the cluster has evaporated, in agreement with observations of host-less ULXs.

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