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

Content Provider	Springer Nature Link
Author	Feroci, Marco Israel, Gian Luca Götz, Diego Stella, Luigi Woods, Peter Zane, Silvia Turolla, Roberto Tiengo, Andrea Mereghetti, Sandro Sidoli, Lara Esposito, Paolo
Copyright Year	2007
Abstract	We present a systematic analysis of all the BeppoSAX data of SGR1900+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 105 s long X-ray afterglow following the April 2001 intermediate flare. In the latter case, we explore the possibility of describing the observed short term spectral evolution only with a change of the temperature of the blackbody component. In the only BeppoSAX observation performed before the giant flare, the spectrum of the SGR1900+14 persistent emission was significantly harder and detected also above 10 keV with the PDS instrument. In the last BeppoSAX observation (April 2002) the flux was at least a factor 1.2 below the historical level, suggesting that the source was entering a quiescent period.
Ending Page	37
Page Count	5
Starting Page	33
File Format	PDF
ISSN	0004640X
e-ISSN	1572946X
Journal	Astrophysics and Space Science
Issue Number	1-4
Volume Number	308
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	2007-03-23
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	X-rays: stars Stars: neutron Stars: individual (SGR 1900+14) Astronomy
Content Type	Text
Resource Type	Article
Subject	Astronomy and Astrophysics Space and Planetary Science

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