Five years of SGR 1900+14 observations with BeppoSAX

Details Five years of SGR 1900+14 observations with BeppoSAX Five years of SGR 1900+14 observations with BeppoSAX

2006-09-04

arxiv.org/abs/astro-ph/0609078v1

Astron.Astrophys.461:605-612,2007

Astronomy and Astrophysics

Astrophysics

Accepted for publication on Astronomy and Astrophysics on August 31, 2006

Scientific paper

10.1051/0004-6361:20065529

We present a systematic analysis of all the BeppoSAX data of the soft gamma-ray repeater SGR 1900+14: these observations allowed us to study the long term properties of the source quiescent emission. In the observation carried out before the 1998 giant flare the spectrum in the 0.8-10 keV energy range was harder and there was evidence for a 20-150 keV emission, possibly associated with SGR 1900+14. This possible hard tail, if compared with the recent INTEGRAL detection of SGR 1900+14, has a harder spectrum (power-law photon index ~1.6 versus ~3) and a 20-100 keV flux ~4 times larger. In the last BeppoSAX observation (April 2002), while the source was entering the long quiescent period that lasted until 2006, the 2-10 keV flux was ~25% below the historical level. We also studied in detail the spectral evolution during the 2001 flare afterglow. This was characterized by a softening that can be interpreted in terms of a cooling blackbody-like component.

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