Computer Science
Scientific paper
Oct 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005xmm..prop...35c&link_type=abstract
XMM-Newton Proposal ID #04008903
Computer Science
White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Xte J1550-564, Gro J1655-40_1, Gro J1655-40_2, Xmm-Newton Proposal 04008903
Scientific paper
We propose to obtain high-quality X-ray spectra of transient black hole binaries (BHBs) in quiescence. The spectra are expected to provide a severe test of the inverse-Compton origin of X-rays from such sources, as expected from accretion-based models. At very low mass accretion rates, a Comptonized spectrum is expected to appear strongly curved in a log-log plot. However, there is already tentative evidence for the power-law shape of the quiescent X-ray spectrum. If confirmed, it would favor a jet origin of the X-ray emission. However, the quality of existing data is still quite poor. The deep observations proposed here will allow a detailed look at the roles of accretion flows and jets in quiescent BHBs and thus cast light on the issues of accretion-jet coupling and particle acceleration in such systems.
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