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Accretion disk parameters in HLX-1

Published online by Cambridge University Press:  21 February 2013

Roberto Soria  and
George Hau
Roberto Soria
Affiliation:
International Centre for Radio Astronomy Research, Curtin University, GPO Box U1987, Perth, WA 6845, Australia email: roberto.soria@icrar.org
George Hau
Affiliation:
European Southern Observatory, Alonso de Cordova 3107, Santiago, Chile email: ghau@eso.org
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Abstract

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We estimate the outer radius of the accretion disk in HLX-1 from its optical brightness and from the exponential timescale of the decline in the X-ray lightcurve after an outburst. We find that the disk is an order of magnitude smaller than the semimajor axis of the orbit. If the disk size is determined by the circularization radius near periastron, the eccentricity of the binary system must be ≳ 0.95. We report on the discovery of Hα emission during the 2012 outburst, with a single-peaked, narrow profile (consistent with a nearly face-on view), and a central velocity displaced by ≈ 490 km s−1 from that of the host galaxy.

Keywords

accretionaccretion discs – X-rays: individual: HLX-1 – black hole physics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S290: Feeding Compact Objects: Accretion on All Scales , August 2012 , pp. 78 - 81
Copyright
Copyright © International Astronomical Union 2013

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