A relativistic iron line in the X-ray spectrum of the atoll source 4U 1705-44?

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White Dwarf Binaries, Neutron Star Binaries, Cataclysmic Variables, Ulxs, Black Holes, 4U 1705-44, Xmm-Newton Proposal 04023001

Scientific paper

We propose to observe with XMM-Newton in AO5 the atoll source 4U 1705-44. The Chandra observation of this source clearly indicates the presence of a broad (sigma about 0.7 keV) iron line. Both a relativistic disk line and a thermal Comptonization broadening fit well the line profile. The superior sensitivity at the iron line energy of XMM-Newton is needed to give a definite answer to the problem of the origin of the broad iron line.

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