Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 335, Issue 3, Pages L67-L70Publisher
BLACKWELL PUBLISHING LTD
DOI: 10.1046/j.1365-8711.2002.05852.x
Keywords
accretion, accretion discs; black hole physics; galaxies : photometry; galaxies : star clusters; X-rays : binaries; X-rays : individual : NGC 5204 X-1
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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).
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