Dissemin is shutting down on January 1st, 2025

Published in

Oxford University Press, Monthly Notices of the Royal Astronomical Society, 2(325), p. L7-L11, 2001

DOI: 10.1046/j.1365-8711.2001.04659.x

Links

Tools

Export citation

Search in Google Scholar

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

Journal article published in 2001 by T. P. Roberts ORCID, Michael R. Goad, M. J. Ward, R. S. Warwick, Paul T. O'Brien, P. Lira, A. D. P. Hands
This paper is available in a repository.
This paper is available in a repository.

Full text: Download

Green circle
Preprint: archiving allowed
Upload
Green circle
Postprint: archiving allowed
Upload
Green circle
Published version: archiving allowed
Upload
Policy details
Data provided by SHERPA/RoMEO

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. ; 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.