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Type-I bursts within outbursts of IGR J17473-2721
Chen YP(陈玉鹏); Zhang S(张澍); Wang JM(王建民); Li TB(李惕碚); Chen, YP; Zhang, S; Torres, DF; Wang, JM; Li, TP
2010
发表期刊ASTRONOMY & ASTROPHYSICS
卷号510页码:A81
通讯作者[Chen, Y. -P. ; Zhang, S. ; Wang, J. -M. ; Li, T. -P.] Inst High Energy Phys, Lab Particle Astrophys, Beijing 100049, Peoples R China ; [Torres, D. F.] Campus UAB, ICREA, Fac Ciencies, Barcelona 08193, Spain ; [Torres, D. F.] Campus UAB, Inst Ciencies Espai, IEEC, CSIC,Fac Ciencies, Barcelona 08193, Spain ; [Li, T. -P.] Tsinghua Univ, Ctr Astrophys, Beijing 100084, Peoples R China
摘要Aims. 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. Methods. A total exposure of similar to 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. Results. 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.
文章类型Article
关键词star: neutron individual: IGR J17473-2721 X-rays: bursts
学科领域Astronomy & Astrophysics
DOI10.1051/0004-6361/200912647
研究领域[WOS]Astronomy & Astrophysics
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语种英语
WOS类目Astronomy & Astrophysics
WOS记录号WOS:000276009100047
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文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/241075
专题院士
粒子天体物理中心
作者单位中国科学院高能物理研究所
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Chen YP,Zhang S,Wang JM,et al. Type-I bursts within outbursts of IGR J17473-2721[J]. ASTRONOMY & ASTROPHYSICS,2010,510:A81.
APA 陈玉鹏.,张澍.,王建民.,李惕碚.,Chen, YP.,...&Li, TP.(2010).Type-I bursts within outbursts of IGR J17473-2721.ASTRONOMY & ASTROPHYSICS,510,A81.
MLA 陈玉鹏,et al."Type-I bursts within outbursts of IGR J17473-2721".ASTRONOMY & ASTROPHYSICS 510(2010):A81.
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