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arXiv 0810.1180astro-ph
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Swift观测到的超巨星快X射线瞬变IGR J08408-4503中的多重耀斑活动

Multiple flaring activity in the supergiant fast X-ray transient IGR J08408-4503 observed with Swift

P. Romano, L. Sidoli, G. Cusumano, P. A. Evans, L. Ducci, H. A. Krimm, S. Vercellone, K. L. Page, A. P. Beardmore, D. N. Burrows, J. A. Kennea, N. Gehrels, V. La Parola, V. Mangano

摘要:

IGR J 08408 -4503是一颗在2006年被发现的超巨星快速X射线瞬变星,与一颗O8.5 Ib(f)超巨星HD 74194有关联。我们报告的分析两个爆发抓住斯威夫特/BAT在2006年10月4日和2008年7月5日,并跟进在较软的能量与斯威夫特/XRT。2008年的XRT光变曲线显示了一个多峰结构,最初的明亮耀斑达到了~ 1 E-9 erg/cm 2/s(2-10 keV)的通量,随后在75 ks内出现了两个同样明亮的耀斑。耀斑的光谱特性差异很大,大部分的差异,通过时间分辨光谱学,是由于吸收柱的变化。随着时间的推移,我们观察到NH逐渐减少,使用吸收幂律模型拟合得出。我们解释这些NH变化是由于第一次耀斑产生的电离效应,导致测得的柱密度显着减少。耀斑的持续时间以及爆发的时间表明,如果在Sidoli等人2007年的模型框架内解释耀斑活动,即爆发是由中子星在相对于轨道平面倾斜的赤道风内通过触发的,则轨道周期约为35天。

英文摘要:

IGR J08408-4503 is a supergiant fast X-ray transient discovered in 2006 with a confirmed association with a O8.5Ib(f) supergiant star, HD 74194. We report on the analysis of two outbursts caught by Swift/BAT on 2006 October 4 and 2008 July 5, and followed up at softer energies with Swift/XRT. The 2008 XRT light curve shows a multiple-peaked structure with an initial bright flare that reached a flux of ~1E-9 erg/cm2/s (2-10 keV), followed by two equally bright flares within 75 ks. The spectral characteristics of the flares differ dramatically, with most of the difference, as derived via time-resolved spectroscopy, being due to absorbing column variations. We observe a gradual decrease of the NH, derived with a fit using absorbed power law model, as time passes. We interpret these NH variations as due to an ionization effect produced by the first flare, resulting in a significant decrease in the measured column density towards the source. The durations of the flares, as well as the times of the outbursts suggest that the orbital period is ~35 days, if the flaring activity is interpreted within the framework of the Sidoli et al 2007 model with the outbursts triggered by the neutron star passage inside an equatorial wind inclined with respect to the orbital plane.

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