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(No) dynamical constraints on the mass of the black hole in two ULXs
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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 ISSN 0004-6337.
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Official URL: http://dx.doi.org/10.1002/asna.201011508
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 | ||||
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Subjects: | Q Science > QB Astronomy | ||||
Divisions: | Faculty of Science, Engineering and Medicine > 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: |
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Volume: | Volume 332 | ||||
Number: | Number 4 | ||||
Page Range: | pp. 398-401 | ||||
DOI: | 10.1002/asna.201011508 | ||||
Status: | Peer Reviewed | ||||
Publication Status: | Published |
Data sourced from Thomson Reuters' Web of Knowledge
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