Magnetars as persistent hard X-ray sources: INTEGRAL discovery of a hard tail in SGR 1900+14
Magnetars as persistent hard X-ray sources: INTEGRAL discovery of a hard tail in SGR 1900+14
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DOI：
10.1051/0004-6361:20064870
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发表时间：
2006-02
影响因子：
6.5
通讯作者：
D. Götz;S. Mereghetti;A. Tiengo;P. Esposito;P. Esposito
中科院分区：
文献类型：
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作者：
D. Götz;S. Mereghetti;A. Tiengo;P. Esposito;P. Esposito
利用INTEGRAL卫星在2003-2004年获得的2.5Ms数据，我们发现软伽马射线中继器SGR 1900+14持续发射硬X射线。其20-100 keV 光谱可以通过光子指数r = 3.1 ± 0.5 和通量1.5 x 10 -11 erg cm -2 s -1 的陡峭幂律很好地描述。与 SGR 1806-20（据报道持续发射超过 20 keV 的唯一其他软伽马射线中继器）相反，SGR 1900+14 在处于静止状态时在硬 X 射线范围内被检测到（该源的最后一次爆发是在 2002 年观察到的）。通过比较 INTEGRAL 检测到的所有磁星（两个 SGR 和三个异常 X 射线脉冲星）的宽带光谱（1-100 keV），我们找到了这两类源的不同光谱行为的证据。
Using 2.5 Ms of data obtained by the INTEGRAL satellite in 2003-2004, we discovered persistent hard X-ray emission from the soft gamma-ray repeater SGR 1900+14. Its 20-100 keV spectrum is well described by a steep power law with photon index r = 3.1 ± 0.5 and flux 1.5 x 10 -11 erg cm -2 s -1 . Contrary to SGR 1806-20, the only other soft gamma-ray repeater for which persistent emission above 20 keV was reported, SGR 1900+14 has been detected in the hard X-ray range while it was in a quiescent state (the last bursts from this source were observed in 2002). By comparing the broad band spectra (1-100 keV) of all the magnetars detected by INTEGRAL (the two SGRs and three anomalous X-ray pulsars) we find evidence for a different spectral behaviour of these two classes of sources.