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

被引：3
|
作者：
Ducci, L. [1 ,2 ]
Mereghetti, S. [3 ]
Goetz, D. [4 ]
Santangelo, A. [1 ]
机构：
[1] Univ Tubingen, Inst Astron & Astrophys, D-72076 Tubingen, Germany
[2] Univ Geneva, ISDC Data Ctr Astrophys, CH-1290 Versoix, Switzerland
[3] INAF Ist Astrofis Spaziale & Fis Cosm, I-20133 Milan, Italy
[4] Univ Paris Diderot, Serv Astrophys Saclay, CNRS, AIM,CEA,DSM,Irfu,UMR 7158, F-91191 Gif Sur Yvette, France
来源：
ASTRONOMY & ASTROPHYSICS | 2015年 / 583卷
关键词：
gamma rays: general; pulsars: individual: SGR 1900+14; pulsars: general; REPEATER SGR-1900+14; ON-BOARD; DISCOVERY; SATELLITE; BEPPOSAX; IMAGER;
D O I：
10.1051/0004-6361/201527029
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
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 similar to 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 F-x = (1.11 +/- 0.17) x 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 similar to 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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页数：4
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