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

By T. P. Roberts, Michael R. Goad, M. J. Ward, R. S. Warwick, Paul T. O'Brien, P. Lira and A. D. P. Hands

Abstract

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.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.Peer-reviewedPublisher Versio

Publisher: Oxford University Press (OUP) on behalf of Royal Astronomical Society
Year: 2001
DOI identifier: 10.1046/j.1365-8711.2001.04659.x
OAI identifier: oai:lra.le.ac.uk:2381/776
Journal:

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Citations

  1. (1998). ApJ, 398, L107 Chandra Proposers Observatory Guide v. 3.0, 2000, Chandra X-ray Center Cambridge,
  2. Survey was produced at the Space Telescope Science Institute,

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