SIMBAD references

2009MNRAS.400..677Z - Mon. Not. R. Astron. Soc., 400, 677-686 (2009/December-1)

Low-metallicity natal environments and black hole masses in ultraluminous X-ray sources.


Abstract (from CDS):

We review the available estimates of the masses of the compact object in ultraluminous X-ray sources (ULXs) and critically reconsider the stellar mass versus intermediate-mass black hole (BH) interpretations. BHs of several hundreds to thousands of M are not required for the majority of ULXs, although they might be present in the handful of known hyperluminous ( ∼ 1041 erg/s) objects and/or some sources showing timing features in their power density spectra. At the same time, however, stellar mass BHs may be quite a reasonable explanation for ULXs below ∼ 1040 erg/s, but they need super-Eddington accretion and some suitable dependence of the beaming factor on the accretion rate in order to account for ULXs above this (isotropic) luminosity. We investigate in detail a `third way' in which a proportion of ULXs contain ~30-90M BHs formed in a low metallicity environment and accreting in a slightly critical regime and find that it can consistently account for the properties of bright ULXs. Surveys of ULX locations looking for a statistically meaningful relationship between ULX position, average luminosity and local metallicity will provide a definitive test of our proposal.

Abstract Copyright: © 2009 The Authors. Journal compilation © 2009 RAS

Journal keyword(s): accretion, accretion discs - black hole physics - X-rays: binaries

Simbad objects: 24

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