4.7 Article

BROAD RELATIVISTIC IRON EMISSION LINE OBSERVED IN SAX J1808.4-3658

Journal

ASTROPHYSICAL JOURNAL LETTERS
Volume 694, Issue 1, Pages L21-L25

Publisher

IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/694/1/L21

Keywords

stars: neutron; X-rays: binaries; X-rays: individual (SAX J1808.4-3658)

Funding

  1. NASA [PF8-90052]

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During the 2008 September-October outburst of the accreting millisecond pulsar SAX J1808.4-3658, the source was observed by both Suzaku and XMM-Newton approximately 1 day apart. Spectral analysis reveals a broad relativistic Fe K alpha emission line which is present in both data sets, as has recently been reported for other neutron star low-mass X-ray binaries. The properties of the Fe K line observed during each observation are very similar. From modeling the Fe line, we determine the inner accretion disk radius to be 13.2 +/- 2.5 GM c(-2). The inner disk radius measured from the Fe K line suggests that the accretion disk is not very receded in the hard state. If the inner disk ( as measured by the Fe line) is truncated at the magnetospheric radius this implies a magnetic field strength of similar to 3 x 10(8) G at the magnetic poles, consistent with other independent estimates.

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