Roberts, Timothy P., Gladstone, Jeanette Claire, Goulding, A. D., Swinbank, A. M., Ward, M. J. (Martin J.), Goad, M. R. and Levan, A. J. (2011) (No) dynamical constraints on the mass of the black hole in two ULXs. Astronomische Nachrichten, Volume 332 (Number 4). pp. 398-401. doi:10.1002/asna.201011508

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Abstract

We present the preliminary results of two Gemini campaigns to constrain the mass of the black hole in an ultraluminous X-ray source (ULX) via optical spectroscopy. Pilot studies of the optical counterparts of a number of ULXs revealed two candidates for further detailed study, based on the presence of a broad He II 4686 A emission line. A sequence of 10 long-slit spectra were obtained for each object, and the velocity shift of the ULX counterpart measured. Although radial velocity variations are observed, they are not sinusoidal, and no mass function is obtained. However, the broad He II line is highly variable on timescales shorter than a day. If associated with the reprocessing of X-rays in the accretion disc, its breadth implies that the disc must be close to face-on. (C) 2011 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim

Item Type:	Journal Article
Subjects:	Q Science > QB Astronomy
Divisions:	Faculty of Science > Physics
Library of Congress Subject Headings (LCSH):	X-ray sources, Galactic, Black holes (Astronomy), Mass (Physics)
Journal or Publication Title:	Astronomische Nachrichten
Publisher:	Wiley - V C H Verlag GmbH & Co. KGaA
ISSN:	0004-6337
Official Date:	2011
Dates:	Date Event 2011 Published
Volume:	Volume 332
Number:	Number 4
Page Range:	pp. 398-401
DOI:	10.1002/asna.201011508
Status:	Peer Reviewed
Publication Status:	Published

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