New Hubble Space Telescope imaging of the counterparts to six ultraluminous X-ray sources

Details New Hubble Space Telescope imaging of the counterparts to six ultraluminous X-ray sources New Hubble Space Telescope imaging of the counterparts to six ultraluminous X-ray sources

2008-03-31

arxiv.org/abs/0803.4470v1

Astronomy and Astrophysics

Astrophysics

6 pages, 1 figure. Accepted for publication in MNRAS letters. For a version of the paper with full resolution figures, see h

Scientific paper

10.1111/j.1365-2966.2008.13293.x

We report the results of new Hubble Space Telescope imaging of the positions of six ultraluminous X-ray sources (ULXs). Using images in three ACS filters we detect good candidate counterparts to four out of six ULXs, with one more possible detection, and observed magnitudes in the range m ~ 22 - 26 in the F606W filter. The extinction-corrected colours and absolute magnitudes vary from source to source, even after correcting for additional extinction in the host galaxy, and only one counterpart is readily explained as an OB star. Nevertheless, these counterparts are decent candidates for future follow-up in pursuit of dynamical mass constraints on the likely black holes powering these sources.

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