Mixed H/He bursts in SAX J1748.9-2021 during the spectral change of its 2015 outburst
文献类型：期刊论文
| 作者 | De Falco, V.; Li, Z.; Falanga, M.; Bozzo, E.; Kuiper, L.; Poutanen, J.; Cumming, A.; Galloway, D.K.; Zhang, S. ; Li, Z
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| 刊名 | ASTRONOMY & ASTROPHYSICS
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| 出版日期 | 2018 |
| 卷号 | 620页码:A114 |
| 关键词 | X-rays: binaries X-rays: bursts stars: neutron |
| ISSN号 | 1432-0746 |
| DOI | 10.1051/0004-6361/201833857 |
| 文献子类 | Article |
| 英文摘要 | SAX J1748.9-2021 is a transiently accreting X-ray millisecond pulsar. It is also known as an X-ray burster source discovered by Beppo-SAX. We analyzed the persistent emission and type-I X-ray burst properties during its 2015 outburst. The source changed from hard to soft state within half day. We modeled the broadband spectra of the persistent emission in the (1-250) keV energy band for both spectral states using the quasi-simultaneous INTEGRAL and Swift data. The broadband spectra are well fitted by an absorbed thermal Componization model, COMPPS, in a slab geometry. The best-fits for the two states indicate significantly different plasma temperature of 18 and 5 keV and the Thomson optical depths of three and four, respectively. In total, 56 type-I X-ray bursts were observed during the 2015 outburst, of which 26 detected by INTEGRAL in the hard state, 25 by XMM-Newton in the soft state, and five by Swift in both states. As the object transited from the hard to the soft state, the recurrence time for X-ray bursts decreased from approximate to 2 to approximate to 1 h. The relation between the recurrence time, Delta t(rec )and the local mass accretion rate per unit area onto the compact object, in, is fitted by a power-law model, and yielded as best fit at Delta t(rec )similar to <(m) over dot >(-1)(.0)(2 +/-)(0.)(03) using all X-ray bursts. In both cases, the observed recurrence times are consistent with the mixed hydrogen and helium bursts. We also discuss the effects of type-I X-ray bursts prior to the hard to soft transition. |
| WOS关键词 | X-RAY BINARIES ; RXTE OBSERVATIONS ; XMM-NEWTON ; JEM-X ; ACCRETION ; SPECTROSCOPY ; PULSATIONS ; RADIATION ; TRANSIENT ; BEHAVIOR |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:000452472000003 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/286883]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 作者单位 | 中国科学院高能物理研究所 |
| 推荐引用方式 GB/T 7714 | De Falco, V.,Li, Z.,Falanga, M.,et al. Mixed H/He bursts in SAX J1748.9-2021 during the spectral change of its 2015 outburst[J]. ASTRONOMY & ASTROPHYSICS,2018,620:A114. |
| APA | De Falco, V..,Li, Z..,Falanga, M..,Bozzo, E..,Kuiper, L..,...&张澍.(2018).Mixed H/He bursts in SAX J1748.9-2021 during the spectral change of its 2015 outburst.ASTRONOMY & ASTROPHYSICS,620,A114. |
| MLA | De Falco, V.,et al."Mixed H/He bursts in SAX J1748.9-2021 during the spectral change of its 2015 outburst".ASTRONOMY & ASTROPHYSICS 620(2018):A114. |
入库方式： OAI收割
来源：高能物理研究所
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