Observations of Intermediate Mass Black Hole Candidate Ultra-Luminous X-ray Sources

Details Observations of Intermediate Mass Black Hole Candidate Ultra-Luminous X-ray Sources Observations of Intermediate Mass Black Hole Candidate Ultra-Luminous X-ray Sources

Sep 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003cxo..prop.1497m&link_type=abstract

Chandra Proposal ID #05601068

Physics

Chandra Proposal Id #05601068

Scientific paper

Ultra-luminous X-ray (ULX) sources are off-nuclear point sources in nearby normal galaxies. Variability observed on the timescale of days, weeks, and years signals that ULXs are accreting sources, likely harboring black holes. However, the observed X-ray luminosity of these systems far exceeds the Eddington limit for a 10 Msun black hole; some ULXs may be intermediate mass black holes. The identification and study of optical counterparts with HST will be central to better understanding these objects. We propose to obtain deep U-B-VI exposures of 4 extremely bright ULXs in nearby spirals: NGC 1313 X-1 and X-2, M81 X-9 (Holmberg II X- 1), and M74 X-1. Each has a 0.5'' Chandra position, and X-ray luminosity and spectral characteristics consistent with expectations for IMBHs.

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