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

被引：108

作者：

Cackett, E. M. ^{[1
]}

Altamirano, D. ^{[2
]}

Patruno, A. ^{[2
]}

Miller, J. M. ^{[1
]}

Reynolds, M. ^{[1
]}

Linares, M. ^{[2
]}

Wijnands, R. ^{[2
]}

机构：

[1] Univ Michigan, Dept Astron, Ann Arbor, MI 48109 USA

[2] Univ Amsterdam, Astron Inst Anton Pannekoek, NL-1098 SJ Amsterdam, Netherlands

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2009年 / 694卷 / 01期

关键词：

stars: neutron; X-rays: binaries; X-rays: individual (SAX J1808.4-3658); MILLISECOND PULSAR SAX-J1808.4-3658; X-RAY TRANSIENTS; ACCRETION DISKS; BLACK-HOLES; BINARIES; STATE; ORBIT; HARD; LONG; SPIN;

D O I：

10.1088/0004-637X/694/1/L21

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

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.

引用

页码：L21 / L25

页数：5

共 33 条

[1]

Arnaud KA, 1996, ASTR SOC P, V101, P17

[2] Evidence of a broad relativistic iron line from the neutron star low-mass X-ray binary Serpens X-1 [J].