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arXiv 0812.0014astro-ph
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XMM-牛顿在软gamma-ray中继器SGR 1627-41中发现2.6 s脉动

XMM-Newton discovery of 2.6 s pulsations in the soft gamma-ray repeater SGR 1627-41

P. Esposito, A. Tiengo, S. Mereghetti, G. L. Israel, A. De Luca, D. Götz, N. Rea, R. Turolla, S. Zane

摘要:

经过近十年的沉寂,软伽马射线中继站SGR 1627-41于2008年5月28日重新激活,爆发事件之后,其持续发射的缓慢衰减增强。为了利用SGR的高通量状态寻找其未知的自旋周期,我们在2008年9月27日至28日使用XMM-牛顿卫星进行了120 ks长的X射线观测。在高于6-sigma的置信水平下检测到P = 2.594578(6)s的脉动,具有双峰脉冲轮廓。在2-12 keV范围内的脉冲分数分别为基波和二次谐波的19% +/- 3%和24% +/- 3%。观测到的2-10 keV能量的通量为3.4 E-13 erg/cm^2/s,仍然比静止的爆发前激活水平高出约5倍,并且光谱可以很好地用吸收幂律加黑体模型拟合(光子指数γ = 0.6,黑体温度kT = 0.5 keV,吸收nH = 1.2 E +23 cm^-2)。我们还探测到了一个弥漫的软X射线发射壳,这可能与年轻的超新星遗迹G337.0-0.1有关。

英文摘要:

After nearly a decade of quiescence, the soft gamma-ray repeater SGR 1627-41 reactivated on 2008 May 28 with a bursting episode followed by a slowly decaying enhancement of its persistent emission. To search for the still unknown spin period of this SGR taking advantage of its high flux state, we performed on 2008 September 27-28 a 120 ks long X-ray observation with the XMM-Newton satellite. Pulsations with P = 2.594578(6) s were detected at a higher than 6-sigma confidence level, with a double-peaked pulse profile. The pulsed fraction in the 2-12 keV range is 19% +/- 3% and 24% +/- 3% for the fundamental and the second harmonic, respectively. The observed 2-10 keV flux is 3.4E-13 erg/cm^2/s, still a factor of ~ 5 above the quiescent pre-burst-activation level, and the spectrum is well fitted by an absorbed power law plus blackbody model (photon index Gamma = 0.6, blackbody temperature kT = 0.5 keV, and absorption nH = 1.2E+23 cm^-2). We also detected a shell of diffuse soft X-ray emission which is likely associated with the young supernova remnant G337.0-0.1.

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