Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14

Abstract : We exploited the high sensitivity of the INTEGRAL IBIS/ISGRI instrument to study the persistent hard X-ray emission of the soft gamma-ray repeater SGR 1900+14, based on ~11.6 Ms of archival data. The 22−150 keV INTEGRAL spectrum can be well fitted by a power law with photon index 1.9 ± 0.3 and flux Fx = (1.11 ± 0.17) × 10-11 erg cm-2 s-1 (20−100 keV). A comparison with the 20−100 keV flux measured in 1997 with BeppoSAX, and possibly associated with SGR 1900+14, shows a luminosity decrease by a factor of ~5. The slope of the power law above 20 keV is consistent within the uncertainties with that of SGR 1806−20, the other persistent soft gamma-ray repeater for which a hard X-ray emission extending up to 150 keV has been reported.
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L. Ducci, S. Mereghetti, D. Götz, A. Santangelo. Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14. Astronomy and Astrophysics - A&A, EDP Sciences, 2015, 583, pp.A113. ⟨10.1051/0004-6361/201527029⟩. ⟨cea-01383762⟩

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