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|Title: ||The identification of an optical counterpart to the super-Eddington X-ray source NGC 5204 X-1|
|Authors: ||Roberts, T. P.|
Goad, Michael R.
Ward, M. J.
Warwick, R. S.
O'Brien, Paul T.
Hands, A. D. P.
|Issue Date: ||2001|
|Publisher: ||Oxford University Press (OUP) on behalf of Royal Astronomical Society|
|Citation: ||Monthly Notices of the Royal Astronomical Society, 2001, 325 (2), pp. L7-L10|
|Abstract: ||We report the identification of a possible optical counterpart to the super-Eddington X-ray source NGC 5204 X-1. New Chandra data show that the X-ray source is point-like, with a luminosity of 5.2×10[superscript 39] erg s[superscript −1](0.5–8 keV). It displays medium- and long-term X-ray variability in observations spanning a period of 20 yr. The accurate Chandra position allows us to identify a blue optical continuum source (m[subscript v]=19.7) at the position of NGC 5204 X-1, using newly obtained optical data from the INTEGRAL instrument on the William Herschel Telescope. The X-ray and optical source properties are consistent with the scenario in which we are observing the beamed X-ray emission of a high-mass X-ray binary in NGC 5204, composed of an O star with either a black hole or neutron star companion.|
|DOI Link: ||10.1046/j.1365-8711.2001.04659.x|
|Version: ||Publisher Version|
|Rights: ||Copyright © 2001, Oxford University Press (OUP) on behalf of Royal Astronomical Society. Deposited with reference to the publisher’s open access archiving policy.|
|Description: ||This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2001 Royal Astronomical Society Published by Oxford University Press on behalf of Royal Astronomical Society. All rights reserved.|
|Appears in Collections:||Published Articles, Dept. of Physics and Astronomy|
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