Testing the accreting intermediate-mass black hole hypothesis in two ULXs

Details Testing the accreting intermediate-mass black hole hypothesis in two ULXs Testing the accreting intermediate-mass black hole hypothesis in two ULXs

Oct 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop..213r&link_type=abstract

XMM-Newton Proposal ID #04056902

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Ngc 5204 X-1, Ngc 5204 X-1, Xmm-Newton Proposal 04056902

Scientific paper

We propose deep XMM-Newton observations of two bright ultraluminous X-ray sources, NGC 4559 X7 and NGC 5204 X-1. Short observations of these ULXs have revealed spectral soft excesses, consistent with an accretion disc around an intermediate-mass black hole. We will use two diagnostic tests, only accessible through high signal-to-noise data, to test whether the accreting IMBH hypothesis remains viable after rigorous examination. Specifically, we will look for curvature in the 2 - 10 keV X-ray spectrum, which is not expected if IMBHs operate in accretion states similar to Galactic black hole binaries, and we will place limits on the underlying black hole masses by deriving the form of the power spectral density for each source.

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