Five years of SGR 1900+14 observations with BeppoSAX

Abstract

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.

arXiv commentAccepted for publication on Astronomy and Astrophysics on August 31, 2006

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• A Swift gaze into the 2006 March 29th burst forest of SGR 1900+14
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• The Compact X-ray Source 1E 1547.0-5408 and the Radio Shell G327.24-0.13: A New Proposed Association between a Candidate Magnetar and a Candidate Supernova Remnant
• Magnetars: a short review and some sparse considerations
• Global Crustal Dynamics of Magnetars in Relation to their Bright X-ray Outbursts
• On the X-ray Spectra of Anomalous X-ray Pulsars and Soft Gamma Repeaters
• X-ray emission from isolated neutron stars
• XMM-Newton observations of Soft Gamma-ray Repeaters
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• Long Term Radiative Behavior of SGR 1900+14
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• Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14
• About the observational check of the mechanism of gamma radiation in Soft Gamma Repeaters (SGR)