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arXiv 1208.0249astro-ph.HE
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候选磁星AX J1818 .8-1559

The magnetar candidate AX J1818.8-1559

S. Mereghetti, P. Esposito, A. Tiengo, D. Gotz, G. L. Israel, A. De Luca

摘要:

2007年10月,INTEGRAL卫星从与AX J1818.8-1559位置一致的方向探测到一个硬X射线爆发,AX J1818.8-1559是ASCA卫星在1996-1999年发现的低银河纬度X射线源。在20-100 keV范围内爆发的短持续时间(0.8 s)和软光谱(幂律光子指数为3.0+/-0.2)是软伽马射线中继器和异常X射线脉冲星的典型特征。我们报告了2011年10月朱雀卫星对AX J1818.8-1559的观测结果。源光谱符合幂律,光子指数为1.5,通量为2 × 10 ^{-12} erg cm^-2 s^-1(2-10 keV),与从1993年至2011年获得的各种卫星(ROSAT、XMM-Newton、Chandra、Swift)的档案数据得出的值相比,没有显示出显著的变化。我们讨论了可能的解释AX J1818.8-1559,并根据其与整数爆发的关联,我们提出它作为一个小类的候选磁星的新成员。

英文摘要:

In October 2007 a hard X-ray burst was detected by the INTEGRAL satellite from a direction consistent with the position of AX J1818.8-1559, an X-ray source at low Galactic latitude discovered with the ASCA satellite in 1996-1999. The short duration (0.8 s) and soft spectrum (power law photon index of 3.0+/-0.2) of the burst in the 20-100 keV range are typical of Soft Gamma-ray Repeaters and Anomalous X-ray Pulsars. We report on the results of an observation of AX J1818.8-1559 obtained with the Suzaku satellite in October 2011. The source spectrum, a power law with photon index 1.5, and flux 2x10^{-12} erg cm^-2 s^-1 (2-10 keV), do not show significant variations with respect to the values derived from archival data of various satellites (ROSAT, XMM-Newton, Chandra, Swift) obtained from 1993 to 2011. We discuss possible interpretations for AX J1818.8-1559 and, based on its association with the INTEGRAL burst, we propose it as a new member of the small class of magnetar candidates.

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