SIMBAD references

2001MNRAS.325L...7R - Mon. Not. R. Astron. Soc., 325, L7-L11 (2001/August-1)

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


Abstract (from CDS):

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 5.2x1039erg.s–1 (0.5-8keV). 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.

1A note on taxonomy: we refer to the class of LX>1039erg.s–1 extra-nuclear sources as SESs throughout this Letter. This class of object is alternatively referred to as SLS, IXOs or ultra-luminous compact X-ray sources (ULXs) in the literature, although the last acronym refers in particular to objects suspected to be powered by accretion.

2The positional error radius is a combination of the ≲1arcsec Chandra positional error and a similar error on the INTEGRAL position, which in practice encompasses the central fibre plus its six immediate neighbours.

3We note that, although O-star spectra generally display absorption features, these are low-contrast features and we do not have the signal-to-noise ratio to distinguish them in the current optical spectrum.

Abstract Copyright: The Royal Astronomical Society

Journal keyword(s): galaxies: individual: NGC 5204 - galaxies: stellar content - X-rays: galaxies

Nomenclature: Fig.1: [RGW2001] JHHMMSS.s+DDMMSS N=1.

Simbad objects: 15

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