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Radiatively inefficient accretion in short-period black hole low mass X-ray binaries

Published online by Cambridge University Press:  22 May 2014

Riley M. T. Connors
Riley M. T. Connors*
Affiliation:
Department of Physics & Astronomy, University of Leicester, Leicester, LE1 7RH, UK Astronomical Institute “Anton Pannekoek”, University of Amsterdam, P. O. Box 94249, 1090 GE Amsterdam, The Netherlands email: [email protected]
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Abstract

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There is statistical evidence for a dearth of short-period (Porb < 4h) black hole (BH) low mass X-ray binaries (LMXBs) in the Galaxy. At short periods accretion onto the central object (be it a BH) may become inefficient because the cooling timescale of the gas is greater than the accretion timescale (this is the well known ADAF model). The nature of the switch is important in terms of the outburst timescales of transient sources. The switch may be sharp or occur smoothly over time. I show that the dearth can be explained if the switch to inefficiency occurs sharply at some fraction of the Eddington luminosity of the BH (fLEdd).

Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 9 , Symposium S303: The Galactic Center: Feeding and Feedback in a Normal Galactic Nucleus , October 2013 , pp. 456 - 457
Copyright
Copyright © International Astronomical Union 2014 

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