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The optical counterpart of the ultraluminous X-ray source NGC 5204 X-1

By Michael R. Goad, T. P. Roberts, C. Knigge and P. Lira

Abstract

We use archival HST/WFPC2 V- and I-band images to show that the optical counterpart to the ultraluminous X-ray source NGC 5204 X-1, reported by Roberts et al., is composed of two sources separated by 0.5 arcsec. We have also identified a third source as a possible counterpart, which lies 0.8 arcsec from the nominal X-ray position. Point spread function fitting photometry yields V-band magnitudes of 20.3, 22.0 and 22.4 for the three sources. The V−I band colours are 0.6, 0.1 and −0.2, respectively (i.e. the fainter sources are bluer). We find that all V−I colours and luminosities are consistent with those expected for young stellar clusters (age <10 Myr)

Topics: accretion, accretion discs, black hole physics, galaxies: photometry, galaxies: star clusters, X-rays: binaries, X-rays: individual: NGC 5204 X-1
Publisher: Wiley, Royal Astronomical Society
Year: 2002
DOI identifier: 10.1046/j.1365-8711.2002.05852.x
OAI identifier: oai:lra.le.ac.uk:2381/777

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  1. (2000). Handbook of Space, Astronomy and Astrophysics. Cambridge Univ. Press, Cambridge This paper has been typeset from a TEX/LATEX file prepared by the author.

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