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

  • Andrea Tiengo
  • Paolo Esposito
  • Sandro Mereghetti
  • Lara Sidoli
  • Diego Götz
  • Marco Feroci
  • Roberto Turolla
  • Silvia Zane
  • Gian Luca Israel
  • Luigi Stella
  • Peter Woods
Conference paper

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.

Keywords

Stars: individual (SGR 1900+14) Stars: neutron X-rays: stars 

PACS

97.60.Jd 98.70.Qy 

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Copyright information

© Springer 2007

Authors and Affiliations

  • Andrea Tiengo
    • 1
  • Paolo Esposito
    • 1
    • 2
  • Sandro Mereghetti
    • 1
  • Lara Sidoli
    • 1
  • Diego Götz
    • 3
  • Marco Feroci
    • 4
  • Roberto Turolla
    • 5
  • Silvia Zane
    • 6
  • Gian Luca Israel
    • 7
  • Luigi Stella
    • 7
  • Peter Woods
    • 8
  1. 1.INAF-IASF MilanoMilanItaly
  2. 2.Dipartimento di Fisica Nucleare e TeoricaUniversità di Pavia, and INFN-PaviaPaviaItaly
  3. 3.CEA Saclay, DSM/DAPNIA/Service d’AstrophysiqueGif-sur-YvetteFrance
  4. 4.INAF-IASF RomaRomaItaly
  5. 5.Dipartimento di FisicaUniversità di PadovaPadovaItaly
  6. 6.Mullard Space Science LaboratoryUniversity College LondonDorking SurreyUnited Kingdom
  7. 7.INAF, Osservatorio Astronomico di RomaMonteporzio CatoneItaly
  8. 8.Dynetics, Inc.HuntsvilleUSA

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