The optical counterpart of the ultraluminous X-ray source NGC 5204 X-1
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).
- Publication:
-
Monthly Notices of the Royal Astronomical Society
- Pub Date:
- September 2002
- DOI:
- 10.1046/j.1365-8711.2002.05852.x
- arXiv:
- arXiv:astro-ph/0207428
- Bibcode:
- 2002MNRAS.335L..67G
- Keywords:
-
- accretion;
- accretion discs;
- black hole physics;
- galaxies: photometry;
- galaxies: star clusters;
- X-rays: binaries;
- X-rays: individual: NGC 5204 X-1;
- Astrophysics
- E-Print:
- 4 pages, 3 figures, accepted for publication in MNRAS