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The 2001 April Burst Activation of SGR 1900+14: Pulse Properties and TorqueWe 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, in contrast to the August 27 giant flare. The absence of rapid spindown in the hours following the April 18 flare suggests that there was no significant outflow of material as was believed to be present following the August 27 flare. Finally, we discuss how these observations further constrain magnetic field reconfiguration models for the large flares of SGRs.
Document ID
20030000544
Acquisition Source
Marshall Space Flight Center
Document Type
Preprint (Draft being sent to journal)
Authors
Woods, P. M.
(Universities Space Research Association United States)
Kouveliotou, C.
(NASA Marshall Space Flight Center Huntsville, AL United States)
Goegues, E.
(Universities Space Research Association United States)
Finger, M. H.
(Universities Space Research Association United States)
Feroci, M.
(Consiglio Nazionale delle Ricerche Rome, Italy)
Mereghetti, S.
(Consiglio Nazionale delle Ricerche Rome, Italy)
Swank, J. H.
(NASA Goddard Space Flight Center Greenbelt, MD United States)
Hurley, K.
(California Univ. Berkeley, CA United States)
Heise, J.
(Space Research Organization Netherlands Utrecht, Netherlands)
Smith, D.
(Michigan Univ. Ann Arbor, MI United States)
Six, N. Frank
Date Acquired
August 21, 2013
Publication Date
January 1, 2002
Subject Category
Astronomy
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

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