Long term spectral variability in the soft gamma ray repeater SGR 1900+14

Details Long term spectral variability in the soft gamma ray repeater SGR 1900+14 Long term spectral variability in the soft gamma ray repeater SGR 1900+14

2006-12-29

arxiv.org/abs/astro-ph/0612787v2

Astrophys.SpaceSci.308:33-37,2007

Astronomy and Astrophysics

Astrophysics

Proceedings of the 363. WE-Heraeus Seminar on: Neutron Stars and Pulsars (Posters and contributed talks) Physikzentrum Bad Hon

Scientific paper

10.1007/s10509-007-9300-7

We present a systematic analysis of all the BeppoSAX data of SGR 1900+14. The observations spanning five years show that the source was brighter than usual on two occasions: ~20 days after the August 1998 giant flare and during the 10^5 sec long X-ray afterglow following the April 2001 intermediate flare. In the latter case, we explore the possibility of describing the observed short term softening only with a change of the temperature of a blackbody-like component. In the only BeppoSAX observation performed before the giant flare, the spectrum of the SGR 1900+14 persistent emission was significantly harder and possibly detected also above 10 keV with the PDS instrument. In the last BeppoSAX observation (April 2002) the flux was ~25 % lower than the historical level, suggesting that the source was entering a quiescent period.

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