Evidence for a sudden magnetic field reconfiguration in soft gamma repeater 1900+14

被引：108

作者：

Woods, PM ^{[1
]}

Kouveliotou, C

Gögüs, E

Finger, MH

Swank, J

Smith, DA

Hurley, K

Thompson, C

机构：

[1] Univ Space Res Assoc, Columbia, MD 21044 USA

[2] NASA, George C Marshall Space Flight Ctr, Huntsville, AL 35812 USA

[3] Univ Alabama, Dept Phys, Huntsville, AL 35899 USA

[4] NASA, Goddard Space Flight Ctr, Greenbelt, MD 20771 USA

[5] MIT, Dept Phys, Cambridge, MA 02138 USA

[6] MIT, Ctr Space Res, Cambridge, MA 02138 USA

[7] Univ Calif Berkeley, Space Sci Lab, Berkeley, CA 94720 USA

[8] Canadian Inst Theoret Phys, Toronto, ON M5S 3H8, Canada

来源：

ASTROPHYSICAL JOURNAL | 2001年 / 552卷 / 02期

关键词：

pulsars : individual (SGR 1900+14); stars : magnetic fields; X-rays : bursts;

D O I：

10.1086/320571

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We report the detection of large flux changes in the persistent X-ray flux of soft gamma repeater (SGR) 1900+14 during its burst active episode in 1998. Most notably, we find a factor of similar to 700 increase in the nonburst X-ray flux following the August 27 flare, which decayed in time as a power law. Our measurements indicate that the pulse fraction remains constant throughout this decay. This suggests a global flux enhancement as a consequence of the August 27 flare rather than localized heating. While the persistent flux has since recovered to the preoutburst level, the pulse profile has not. The pulse shape changed to a near sinusoidal profile within the tail of the August 27 flare (in gamma -rays), and this effect has persisted for more than 1.5 years (in X-rays). The results presented here suggest that the magnetic field of the neutron star in SGR 1900+14 was significantly altered (perhaps globally) during the giant flare of August 27.

引用

页码：748 / 755

页数：8

共 28 条

[1] The giant flare of 1998 August 27 from SGR 1900+14.: I.: An interpretive study of BeppoSAX and Ulysses observations [J].