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

L. Ducci (1, 2) , S. Mereghetti (3) , D. Götz (4) , A. Santangelo (1)

1 IAAT - Institut für Astronomie und Astrophysik [Tübingen]
2 ISDC - INTEGRAL Science Data Center
3 IASF-MI - Istituto di Astrofisica Spaziale e Fisica Cosmica - Milano
4 AIM (UMR7158 / UMR_E_9005 / UM_112) - Astrophysique Interprétation Modélisation

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.

Mots clés: gamma rays: general; pulsars: individual: SGR 1900+14; pulsars: general

Domaines: Astrophysique [astro-ph]

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, 2015, 583, pp.A113. ⟨10.1051/0004-6361/201527029⟩. ⟨cea-01383762⟩