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The identification of an optical counterpart to the super-Eddington X-ray source NGC 5204 X-1

Roberts, T. P. and Goad, M. R. and Ward, M. J. and Warwick, R. S. and O'Brien, P. T. and Lira, P. and Hands, A. D. P. (2001) 'The identification of an optical counterpart to the super-Eddington X-ray source NGC 5204 X-1.', Monthly notices of the Royal Astronomical Society., 325 (2). L7-L11.

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 5.2×10^39 erg/s (0.5-8 keV). It displays medium- and long-term X-ray variability in observations spanning a period of 20yr. The accurate Chandra position allows us to identify a blue optical continuum source (mv=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.

Item Type:Article
Keywords:High-resolution imager, All-sky survey, Rosat observations, Nearby galaxies, Emission, Sample.
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Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1046/j.1365-8711.2001.04659.x
Publisher statement:This article has been accepted for publication in Monthly notices of the Royal Astronomical Society © 2001 The Authors Published on behalf of Royal Astronomical Society. All rights reserved.
Date accepted:No date available
Date deposited:08 August 2014
Date of first online publication:August 2001
Date first made open access:No date available

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