Large Changes in Source Flux and Spin-down Rate of SGR 1900+14

Details Large Changes in Source Flux and Spin-down Rate of SGR 1900+14 Large Changes in Source Flux and Spin-down Rate of SGR 1900+14

Oct 2000

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000head....5.3602w&link_type=abstract

American Astronomical Society, HEAD Meeting #5, #36.02; Bulletin of the American Astronomical Society, Vol. 32, p.1247

Astronomy and Astrophysics

Astronomy

Scientific paper

We report on the detection of large flux changes in the persistent X-ray counterpart of SGR 1900+14 during its burst active episode in 1998. We find a power-law decay of the flux enhancement following the August 27 th flare with the pulse fraction remaining constant. The constant pulse fraction suggests a global flux enhancement as a consequence of the August 27 th flare rather than localized heating. The persistent flux has since recovered to the pre-outburst level, however, the pulse profile has not. The pulse shape changes observed within the tail of the August 27 th flare (in γ -rays) have persisted for more than 1.5 years (in X-rays) and show no signs of recovery. We have also discovered a substantial increase in the average spin-down rate of SGR 1900+14, long after burst activity has ceased.

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