Other
Scientific paper
Oct 2008
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008xmm..prop...40r&link_type=abstract
XMM-Newton Proposal ID #06016701
Other
White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Ngc 470 Hlx-1
Scientific paper
It is now thought that most ultraluminous X-ray sources harbour stellar remnant (up to 100 M(sun)) black holes undergoing extreme accretion. However, this does not preclude some ULXs being powered by larger intermediate-mass black holes. Perhaps the best candidates are the rare hyperluminous X-ray sources, the most luminous of ULXs with L(x) above 10^41 erg/s. Here we propose XMM-Newton observations of two HLXs found as serendipitous sources in the 2XMM catalogue. We will determine whether their characteristics are similar to other ULXs, e.g. showing a spectral break at a few keV, implying they are small black holes accreting at extreme rates, or whether they instead appear like IMBHs accreting in a sub-Eddington (high or very high) state.
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