arxiv: 1510.00940 · v1 · pith:6H6TMDX4new · submitted 2015-10-04 · 🌌 astro-ph.HE

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

L. Ducci (1 , 2) , S. Mereghetti (3) , D. G\"otz (4) , A. Santangelo (1) ((1) IAAT , University of T\"ubingen , (2) ISDC Gen\`eve , (3) INAF/IASF Milano

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(4) AIM Irfu/Service d'Astrophysique-Saclay)

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keywords emissionhardintegralx-rayfluxgamma-raypersistentpower

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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 fit by a power law with photon index 1.9 +/- 0.3 and flux F_x = (1.11 +/- 0.17)E-11 erg/cm^2/s (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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Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14

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