Tracking spectral variability with luminosity in the ultraluminous state

Details Tracking spectral variability with luminosity in the ultraluminous state Tracking spectral variability with luminosity in the ultraluminous state

Oct 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010xmm..prop..167s&link_type=abstract

XMM-Newton Proposal ID #06739202

Astronomy and Astrophysics

Astrophysics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Ngc 5907 Ulx, Ngc 5907 Ulx

Scientific paper

A substantial body of evidence suggests that most ultraluminous X-ray sources (ULXs) are stellar remnant black holes accreting at super-Eddington rates, in a new `ultraluminous' accretion state. Little is known of the astrophysics of this putative state to date. Gladstone et al. (2009) propose a sequence of three spectral regimes that ULXs may progress through as their accretion rate increases; but no evidence for this progression from an individual source has yet been seen. Here, we propose three observations of a highly variable ULX in NGC 5907, triggered at different flux levels by Swift monitoring data. These will investigate whether large amplitude luminosity variation in a ULX is accompanied by transitions through these ultraluminous state regimes.

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