A Broad Iron Line in the Chandra/HETG Spectrum of 4U 1705-44

Astronomy and Astrophysics – Astronomy

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Accretion, Accretion Disks, Stars: Individual: 4U 1705-44, Stars: Neutron, X-Rays: Stars, X-Rays: Binaries, X-Rays: General

Scientific paper

We present preliminary results from a Chandra 30 ks observation of the atoll source 4U 1705-44. In particular we concentrate on the study of the iron K α line, using the HEG spectrometer. The iron K α line at ˜ 6.6 keV is found to be intrinsically broad ( FWHM ˜ 1.7 keV); its width can be explained by reflection from a cold accretion disk extending down to ˜ 17 km from the neutron star center or by Compton broadening in the hotter ( ˜ 3 - 4 keV) corona.

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