Volume 583, November 2015
|Number of page(s)||4|
|Published online||04 November 2015|
Ten years of INTEGRAL observations of the hard X-ray emission from SGR 1900+14
1 Institut für Astronomie und Astrophysik, Eberhard Karls Universität, Sand 1, 72076 Tübingen, Germany
2 ISDC Data Center for Astrophysics, Université de Genève, 16 chemin d’Écogia, 1290 Versoix, Switzerland
3 INAF–Istituto di Astrofisica Spaziale e Fisica Cosmica, via E. Bassini 15, 20133 Milano, Italy
4 AIM (UMR 7158 CEA/DSM-CNRS-Université Paris Diderot) Irfu/Service d’Astrophysique, Saclay, 91191 Gif-sur-Yvette Cedex, France
Received: 21 July 2015
Accepted: 4 October 2015
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.
Key words: gamma rays: general / pulsars: individual: SGR 1900+14 / pulsars: general
© ESO, 2015
Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.
Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.
Initial download of the metrics may take a while.