The 2001 April Burst Activation of SGR 1900+14: Pulse Properties and Torque

Details The 2001 April Burst Activation of SGR 1900+14: Pulse Properties and Torque The 2001 April Burst Activation of SGR 1900+14: Pulse Properties and Torque

2003-06-04

arxiv.org/abs/astro-ph/0306092v1

Astrophys.J. 596 (2003) 464-469

Astronomy and Astrophysics

Astrophysics

13 pages, 3 figures, accepted for publication in ApJ

Scientific paper

10.1086/376891

We report on observations of SGR 1900+14 made with the Rossi X-ray Timing Explorer (RXTE) and BeppoSAX during the April 2001 burst activation of the source. Using these data, we measure the spindown torque on the star and confirm earlier findings that the torque and burst activity are not directly correlated. We compare the X-ray pulse profile to the gamma-ray profile during the April 18 intermediate flare and show that (i) their shapes are similar and (ii) the gamma-ray profile aligns closely in phase with the X-ray pulsations. The good phase alignment of the gamma-ray and X-ray profiles suggests that there was no rapid spindown following this flare of the magnitude inferred for the August 27 giant flare. We discuss how these observations further constrain magnetic field reconfiguration models for the large flares of SGRs.

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