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A Peculiar Hard X-ray Flare in Massive X-ray Binary 4U 2206+54

机译:大型X射线二进制4U中的特殊硬X射线耀斑2206 + 54

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We reported the discovery of a peculiar hard X-ray flare in a massive X-ray binary 4U 2206+54 occurring on 15 December 2005 with a duration of about 2 days. The X-ray flare had a double-main-peak feature. The first peak showed a fast rise and long time decaying light curve about 15 hours with a peak luminosity of 4 x 1036 erg/ s and a hard spectrum (only seen above 5 keV). The second peak had the mean hard X-ray luminosity of 1.2 x 1036 erg/s from 20 -100 keV with a modulation period at 5550 s which is the pulse period of the neutron star in 4U 2206+54. The hard X-ray flare emit gamma-ray photons above 300 keV with a total released energy higher than 1041 erg. The hard X-ray spectrum just before the flare showed cyclotron absorption features at 30 keV and 60 keV, implying a neutron star with magnetic field of 3 x 1012 G. The flare may relate to astrophysical processes around the highly magnetized neutron star. We suggest that the hard X-ray flare could be induced by suddenly enhanced accreting dense materials from stellar winds hitting the polar cap region of the neutron star. This hard X-ray outburst may be a link to supergiant fast X-ray transients though 4U 2206+54 has a different type of companion. The possible formation mechanisms of these long pulsation period X-ray pulsars are also discussed.
机译:我们报道了在2005年12月15日持续2天的大规模X射线双星4U 2206 + 54中发现了一个特殊的硬X射线耀斑。 X射线耀斑具有双主峰特征。第一个峰显示出快速上升和长时间衰减的光曲线,大约15小时,其峰亮度为4 x 1036 erg / s,光谱较硬(仅在5 keV以上可见)。第二个峰值的20 -100 keV的平均硬X射线发光度为1.2 x 1036 erg / s,调制周期为5550 s,这是4U 2206 + 54中中子星的脉冲周期。硬X射线耀斑发射300 keV以上的伽马射线光子,总释放能量高于1041 erg。耀斑之前的硬X射线光谱在30 keV和60 keV处显示回旋加速器吸收特征,这意味着磁场为3 x 1012 G的中子星。耀斑可能与高度磁化的中子星周围的天体物理过程有关。我们认为,强烈的X射线耀斑可能是由恒星风撞击中子星极帽区域突然增加的吸积稠密物质引起的。尽管4U 2206 + 54具有不同类型的伴随,但这种硬X射线爆发可能是超快速X射线瞬变的链接。还讨论了这些长脉冲周期X射线脉冲星的可能形成机理。

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