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

2008-08-15

arxiv.org/abs/0808.2214v1

Astronomy and Astrophysics

Astrophysics

7 pages, 2 figures, accepted for publication in ApJ

Scientific paper

10.1086/592429

We present an analysis of XMM-Newton and RXTE data from three 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-alpha emission from the inner accretion disk. The Fe K-alpha line in 4U 1636-536 is considerably broader than the asymmetric iron lines recently found in other neutron star LMXBs, which indicates a high disk inclination. We find evidence that the broad iron line feature is a combination of several K-alpha lines from iron in different ionization states.

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