反常源XSS J12270-4859的朱雀X射线研究
Suzaku X-Ray Study of an Anomalous Source XSS J12270-4859
摘要：
本文报道了对INTEGRAL星表中硬X射线源XSS J12270-4859的朱雀X射线观测结果。根据光谱和推定的X射线周期~860 s，该天体已被归类为中间极性（IP）。在30 ks曝光的朱雀，我们得到了一个很好的曝光光谱在0.2-70 keV波段。我们得出结论，对以前的IP分类的基础上，缺乏铁Ka发射功能的频谱和未能确认以前报告的X射线的时期。相反，X射线光变曲线充满了奇异的现象，包括持续约100 s的重复耀斑，没有明显周期性的偶尔下降，一些耀斑后的光谱硬化，以及在安静和活跃阶段之间旋转的双峰变化。快速的通量变化，下降，和幂律谱指向的解释，这是一个低质量的X射线联星。一些时间特征与快速爆发者和GRO J1744-28相似，使XSS J12270-4859成为一个非常罕见的天体。
英文摘要：
We report the results of the Suzaku X-ray observation of XSS J12270-4859, one of the hard X-ray sources in the INTEGRAL catalogue. The object has been classified as an intermediate polar (IP) by optical spectra and a putative X-ray period of ~860 s. With a 30 ks exposure of Suzaku, we obtained a well-exposed spectrum in the 0.2-70 keV band. We conclude against the previous IP classification based on the lack of Fe Ka emission features in the spectrum and the failure to confirm the previously reported X-ray period. Instead, the X-ray light curve is filled with exotic phenomena, including repetitive flares lasting ~100 s, occasional dips with no apparent periodicities, spectral hardening after some flares, and bimodal changes pivoting between quiet and active phases. The rapid flux changes, the dips, and the power-law spectrum point toward the interpretation that this is a low-mass X-ray binary. Some temporal characteristics are similar to those in the Rapid Burster and GRO J1744-28, making XSS J12270-4859 a very rare object.
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