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arXiv 1002.1044astro-ph.HE
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IGR J17473-2721爆发中的I型爆发

Type-I bursts within outbursts of IGR J17473-2721

Yu-Peng Chen, Shu Zhang, Diego F. Torres, Jian-Min Wang, Ti-Pei Li

摘要:

在环礁源IGR J17473-2721的历史中,RXTE观测到了两次爆发。在2008年的最近一次爆发中,源显示了一系列完整的光谱状态/跃迁。中子星系统是多产的I型X射线爆发,我们调查他们在完整的爆发演化的背景下。在IGR J17473-2721的两次爆发期间,RXTE收集了约309 ks的总暴露量。我们在这个数据集中进行了I型爆发的系统搜索。对于每一个爆发发现,我们研究了爆发的轮廓,峰值流量,以及它们对吸积率的依赖性沿爆发的演变。在IGR J17473-2721中发现了18个I型X射线爆发:两个来自2005年的爆发,另外16个来自2008年的爆发。其中,3个爆发显示光球半径膨胀(PRE)。距离源估计为6.4千秒差距与15%的不确定性的基础上,显示PRE的三个爆发。在最近的突发中,在状态转换到高/软状态之前的低/硬状态中出现6个突发,在高/软状态的结束阶段出现3个突发,在随后的低/硬状态中出现7个突发。这些爆发的黑体半径呈现出各种有趣的特征。我们发现,在最近的爆发结束时,黑体半径的轮廓与黑体温度和爆发通量是反相关的。I型爆发的持续时间被发现与爱丁顿比相关,并有两个平行的演化群。随着爱丁顿比的减小,爆发持续时间减少,并在发生PRE爆发的每个组中结束。这为环礁XRB爆发背景下的I型爆发提供了新的线索。

英文摘要:

Two outbursts were observed by RXTE in the history of the atoll source IGR J17473-2721. During the most recent outburst in 2008, the source showed a complete series of spectral states/transitions. The neutron star system was prolific in type-I X-ray bursts, and we investigate them in the context of complete outbursts evolution. A total exposure of ~ 309 ks was collected by RXTE during the two outbursts of IGR J17473-2721. We carried out a systematic search for type-I bursts in this data set. For each burst found, we investigated the burst profile, the peak flux, and their dependence on the accretion rate along the evolution of the outbursts. Eighteen type-I X-ray bursts were found from IGR J17473-2721: two from the outburst in 2005 and the other 16 from the recent outburst in 2008. Among them, 3 bursts show photospheric radius expansion (PRE). The distance to the source is estimated as 6.4 kpc with a 15% uncertainty based on the three bursts that show PRE. In the recent outburst, there are 6 bursts showing up in the low/hard state prior to the state transition to a high/soft state, 3 bursts at the end phase of the high/soft state, and 7 in the following low/hard state. The blackbody radius of these bursts presents a variety of interesting features. We find that at the end of the recent outburst, the profile of the blackbody radius is anti-correlated with the blackbody temperature and the burst flux. The durations of the type-I burst are found to correlate with the Eddington ratio and to have two parallel evolution groups. Along the decreasing Eddington ratio, the burst duration decreases and ends in each group the PRE bursts occurred. This provides new clues to the type-I bursts in the context of outbursts for atoll XRBs.

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