Relativistic Iron Line Emission from the Neutron Star Low-mass X-ray Binary 4U 1636-536

Details Relativistic Iron Line Emission from the Neutron Star Low-mass X-ray Binary 4U 1636-536 Relativistic Iron Line Emission from the Neutron Star Low-mass X-ray Binary 4U 1636-536

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008aas...212.1401p&link_type=abstract

American Astronomical Society, AAS Meeting #212, #14.01; Bulletin of the American Astronomical Society, Vol. 40, p.207

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Scientific paper

Relativistically broadened, asymmetric Fe K-α lines have recently been found in the X-ray spectra of several neutron star low-mass X-ray binaries (LMXBs). Here we present an analysis of XMM-Newton and RXTE data from two observations of the neutron star LMXB 4U 1636-536. The X-ray spectra show clear evidence of a broad, asymmetric iron emission line extending over the energy range 4--9 keV. The line profile is consistent with relativistically broadened Fe K-α emission from the inner accretion disk. The Fe K-α line in 4U 1636-536 is considerably broader than the asymmetric iron lines found in other neutron star LMXBs, which indicates a high disk inclination of the system. We find evidence that the broad iron line feature is a combination of several K-α lines from iron in different ionization states.

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