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arXiv 1012.0855astro-ph.HE
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朱雀观测到来自IGR J17391-3021的弱耀斑,代表了该SFXT中常见的低活动状态

Suzaku observes weak flares from IGR J17391-3021 representing a common low-activity state in this SFXT

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

摘要:

本文分析了用朱雀星收集的超巨星快X射线瞬变(SFXT)IGR J17391-3021(=XTE J1739-302)的37-ks观测结果。源从平静发展到低活动水平,最终在三个弱耀斑持续约3 ks,其中峰值亮度只有一个因素的5倍,耀斑前的亮度。在0.5- 10 keV范围内,观测到的最小光度为1.3 × 10^33 erg/s(d/2.7 kpc)^[2]。微弱的耀斑伴随着光谱参数的显著变化,包括柱密度(nH =(4.1+-0.5 x10 ^22/cm ^2),它是静止时测量的吸收的2- 9倍。恒星风物质的模糊团块的吸积可以解释小耀斑和nH的增加。将这一观察结果放在最近的雨燕监测活动的背景下,我们发现,弱耀斑事件,或至少是在静止水平之上但远低于中等亮度或高亮度爆发的增强活动时期,在0.5- 10 keV能量范围内,占所有观测结果的60+-5%以上,使其成为IGR J17391发射行为中最常见的状态。3021

英文摘要:

We present an analysis of a 37-ks observation of the supergiant fast X-ray transient (SFXT) IGR J17391-3021 (=XTE J1739-302) gathered with Suzaku. The source evolved from quiescence to a low-activity level culminating in three weak flares lasting ~3 ks each in which the peak luminosity is only a factor of 5 times that of the pre-flare luminosity. The minimum observed luminosity was 1.3x10^33 erg/s (d/2.7 kpc)^2 in the 0.5--10 keV range. The weak flares are accompanied by significant changes in the spectral parameters including a column density (nH = (4.1+-0.5)x10^22 /cm^2) that is ~2--9 times the absorption measured during quiescence. Accretion of obscuring clumps of stellar wind material can explain both the small flares and the increase in nH. Placing this observation in the context of the recent Swift monitoring campaign, we find that weak-flaring episodes, or at least epochs of enhanced activity just above the quiescent level but well below the moderately bright or high-luminosity outbursts, represent more than 60+-5% of all observations in the 0.5--10keV energy range making this the most common state in the emission behavior of IGR J17391-3021

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