The identification of an optical counterpart to the super-Eddington X-ray source NGC 5204 X-1
journal contributionposted on 2009-12-08, 16:24 authored by T. P. Roberts, Michael R. Goad, M. J. Ward, R. S. Warwick, Paul T. O'Brien, P. Lira, A. D. P. Hands
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.
CitationMonthly Notices of the Royal Astronomical Society, 2001, 325 (2), pp. L7-L10
- VoR (Version of Record)