ULX counterparts: the key to finding intermediate-mass black holes

Details ULX counterparts: the key to finding intermediate-mass black holes ULX counterparts: the key to finding intermediate-mass black holes

Sep 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005cxo..prop.1871r&link_type=abstract

Chandra Proposal ID #07621082

Physics

Chandra Proposal Id #07621082

Scientific paper

Most formation scenarios for supermassive black holes rely on large black holes being present in the early universe, formed by the collapse of primordial Population III stars. A relic of this population could still be present in galactic halos at the current epoch, though no CONCLUSIVE evidence for such a class of "intermediate-mass" black holes has been found. The most likely current candidates are the ultraluminous X-ray sources (ULXs), which show tantalising evidence for IMBHs (e.g. extreme X-ray luminosities and low accretion disc temperatures). We propose to search for optical counterparts to six of the nearest ULXs. We will use this programme as a pathfinder for future radial velocity measurements, potentially providing the first undisputed mass constraints for these systems.

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