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Title: The optical counterpart of the ultraluminous X-ray source NGC 5204 X-1
Authors: Goad, Michael R.
Roberts, T. P.
Knigge, C.
Lira, P.
First Published: 27-Sep-2002
Publisher: Wiley, Royal Astronomical Society
Citation: Monthly Notices of the Royal Astronomical Society, 2002, 335 (3), pp.L67-L70
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).
DOI Link: 10.1046/j.1365-8711.2002.05852.x
Type: Article
Rights: Archived with reference to SHERPA/RoMEO and publisher website.
Appears in Collections:Published Articles, Dept. of Physics and Astronomy

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