Relativistic Iron K-α Lines in the Neutron Star Low-mass X-ray Binary 4U 1636-536

Details Relativistic Iron K-α Lines in the Neutron Star Low-mass X-ray Binary 4U 1636-536 Relativistic Iron K-α Lines in the Neutron Star Low-mass X-ray Binary 4U 1636-536

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008head...10.1015p&link_type=abstract

American Astronomical Society, HEAD meeting #10, #10.15

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Scientific paper

Relativistically broadened, asymmetric iron K-α lines have been observed in many supermassive and stellar-mass black holes. Recently, observations have revealed similar asymmetric iron line profiles in the X-ray spectra of several neutron star low-mass X-ray binaries (LMXBs). Here we report on the analysis of XMM-Newton and RXTE data of the neutron star LMXB 4U 1636-536. We find clear evidence of a broad, asymmetric iron line in the energy range 4-9 keV. The line profile is consistent with relativistically broadened iron K-α emission from the inner accretion disk. The iron K-α line in 4U 1636-536 is considerably broader than the asymmetric iron lines observed in other neutron star LMXBs, which indicates a high disk inclination. We find evidence that the broad iron line feature is a combination of K-α lines from iron at different ionization states.

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