The accretion disk in the hard state of black hole transients at low absorption.

Details The accretion disk in the hard state of black hole transients at low absorption. The accretion disk in the hard state of black hole transients at low absorption.

Oct 2009

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009xmm..prop...48h&link_type=abstract

XMM-Newton Proposal ID #06515202

Physics

White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, Xte J1118+480, Xte J1817-330

Scientific paper

The accretion-disk geometry and the source of soft photons in the hard state of accreting black holes remain a point of debate. In contradiction to the standard scenario of a truncated disk in the hard state, results in the last three years seem to suggest that in four black holes in the hard state the disk is not truncated, but extends down close to the innermost stable circular orbit. These results, however, have recently been contested. Here we propose two XMM-Newton observations of 40 ks each, to study the hard-state spectra of two BH X-ray transients at low interstellar absorption: XTE J1118+480 and XTE J1817-330. We will search for soft emission and/or a broad iron line to test the extent of the inner accretion disk.

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