NASA Logo

NTRS

NTRS - NASA Technical Reports Server

Back to Results
On the Variable Spin-Down of SGR 1900+14We consider the physical implications of the rapid spindown of Soft Gamma Repeater 1900+14 reported in a companion paper by Woods et al. During an 80 day interval between June 1998 and the large outburst on August 27, 1998, the mean spin-down rate increased by a factor 2.3 resulting in a positive period offset of delta P/P = 1 X 10(exp -4)/ A radiation hydrodynamical outflow associated with the August 27 event could impart the required torque, but only if the dipole magnetic field is stronger than about 10(exp 14) G and the outflow lasts longer than the observed X-ray flare. A positive period increment is also a natural consequence of a gradual plastic deformation of the neutron star crust by an intense magnetic field. Finally, we discuss the relative stability of the long term spin-down rate of SGR 1900+14, and compare the relative spindown rates of the SGRs and the Anomalous X-ray Pulsars.
Document ID
20000014152
Acquisition Source
Marshall Space Flight Center
Document Type
Reprint (Version printed in journal)
Authors
Thompson, Christopher
(North Carolina Univ. Chapel Hill, NC United States)
Duncan, Robert C.
(Texas Univ. Austin, TX United States)
Woods, Peter M.
(Alabama Univ. Huntsville, AL United States)
Kouveliotou, Chryssa
(Universities Space Research Association Huntsville, AL United States)
vanParadijs, Jan
(Alabama Univ. Huntsville, AL United States)
Finger, Mark H.
(Universities Space Research Association Huntsville, AL United States)
Date Acquired
August 19, 2013
Publication Date
January 1, 1999
Subject Category
Astrophysics
Distribution Limits
Public
Copyright
Work of the US Gov. Public Use Permitted.

Available Downloads

There are no available downloads for this record.
No Preview Available