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Title:
Relativistic Iron Line Emission from the Neutron Star Low-mass X-ray Binary 4U 1636-536
Authors:
Pandel, Dirk; Kaaret, P.; Corbel, S.
Affiliation:
AA(The University of Iowa), AB(The University of Iowa), AC(Universite Paris VII, France)
Publication:
American Astronomical Society, AAS Meeting #212, #14.01; Bulletin of the American Astronomical Society, Vol. 40, p.207
Publication Date:
05/2008
Origin:
AAS
Bibliographic Code:
2008AAS...212.1401P

Abstract

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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