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arXiv 1111.5310astro-ph.HE
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朱雀星观测到的超巨星X射线双星

Supergiant X-ray binaries observed by Suzaku

A. Bodaghee, J. A. Tomsick, J. Rodriguez, S. Chaty, K. Pottschmidt, R. Walter, P. Romano

摘要:

介绍了高质量X射线双星IGR J 16207 -5129和IGR J 17391 -3021(=XTE J 1739 -302)的朱雀观测结果。对于IGR J16207-5129,我们提供了第一个X射线宽带(0.5- 60 keV)谱,从中我们确认了大的本征柱密度(nH = 1.6e ~(23)/cm ~ 2),并且我们第一次限制了截止能量(Ec = 19 keV)。观测到X射线通量的长时间(> 30 ks)衰减,我们暂时将其归因于可能的中子星被它的大质量伴星所食,这是一个轨道周期在4到9天之间、倾角> 50度的双星系统。对于IGR J17391-3021,我们看到了一个从静止到低活动阶段的过渡,其间有微弱的耀斑,其峰值亮度在0.5- 10 keV波段,只有耀斑前的5倍。这些微耀斑伴随着nH的增加,这表明了模糊风团的吸积。我们现在认识到,这些低活动时期构成了这个系统最常见的发射阶段,也许在其他超巨星快速X射线瞬变(SFXTs)中也是如此。最后,我们概述了我们即将到来的计划,其中朱雀将在双星轨道期间首次观测SFXT(IGR J16479-4514),使我们能够探测每个阶段的吸积风。

英文摘要:

Suzaku observations are presented for the high-mass X-ray binaries IGR J16207-5129 and IGR J17391-3021 (=XTE J1739-302). For IGR J16207-5129, we provide the first X-ray broadband (0.5--60 keV) spectrum from which we confirm a large intrinsic column density (nH = 1.6e23 /cm2), and we constrain the cutoff energy for the first time (Ec = 19 keV). A prolonged (> 30 ks) attenuation of the X-ray flux was observed which we tentatively attribute to an eclipse of the probable neutron star by its massive companion, in a binary system with an orbital period between 4 and 9 days, and inclination angles > 50 degrees. For IGR J17391-3021, we witnessed a transition from quiescence to a low-activity phase punctuated by weak flares whose peak luminosities in the 0.5--10 keV band are only a factor of 5 times that of the pre-flare emission. These micro flares are accompanied by an increase in nH which suggests the accretion of obscuring clumps of wind. We now recognize that these low-activity epochs constitute the most common emission phase for this system, and perhaps in other supergiant fast X-ray transients (SFXTs) as well. We close with an overview of our upcoming program in which Suzaku will provide the first ever observation of an SFXT (IGR J16479-4514) during a binary orbit enabling us to probe the accretion wind at every phase.

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