STATISTICS OF X-RAY FLARES OF SAGITTARIUS A(star): EVIDENCE FOR SOLAR-LIKE SELF-ORGANIZED CRITICALITY PHENOMENA
文献类型：期刊论文
| 作者 | Li, Ya-Ping1,2; Yuan, Feng1,2,3 ; Yuan, Qiang4; Wang, Q. Daniel4; Chen, P. F.5; Neilsen, Joseph6,7; Fang, Taotao1,2; Zhang, Shuo8; Dexter, Jason9
|
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2015-09-01 |
| 卷号 | 810期号:1页码:1 |
| 关键词 | accretion black hole physics Galaxy: center methods: statistical accretion disks |
| 英文摘要 | X-ray flares have routinely been observed from the supermassive black hole. at our Galactic center, Sagittarius A(star) (Sgr A(star)). The nature of these flares remains largely unclear, despite many theoretical models. In this paper, we study the statistical properties of the Sgr A(star) X-ray flares by fitting the count rate (CR) distribution and the structure function of the light curve with a Markov Chain Monte Carlo method. With the 3-million-second Chandra observations accumulated in the Sgr A(star) X-ray Visionary Project, we construct the theoretical light curves through Monte Carlo simulations. We find that the 2-8 keV X-ray light curve can be decomposed into a quiescent component with a constant CR of 6 x 10(-3) count s(-1) and a flare component with a power-law fluence distribution dN dE proportional to E-aE with alpha(E)= 1.65. 0.17. The duration-fluence correlation can also be modeled as a power law T proportional to E-alpha ET with alpha(ET) < 0.55 (95% confidence). These statistical properties are consistent with the theoretical prediction of the self-organized criticality system with the spatial dimension S = 3. We suggest that the X-ray flares represent plasmoid ejections driven by magnetic reconnection (similar to solar flares) in the accretion flow onto the black hole. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SGR-A-ASTERISK ; SUPERMASSIVE BLACK-HOLE ; VARIABLE INFRARED-EMISSION ; GALACTIC-CENTER ; FLARING ACTIVITY ; ACCRETION FLOW ; BRIGHTEST FLARE ; XMM-NEWTON ; FLUCTUATIONS ; CHANDRA |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000361800900019 |
| 源URL | [http://119.78.226.72/handle/331011/28371]  |
| 专题 | 上海天文台_星系宇宙学重点实验室 |
| 作者单位 | 1.Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China 2.Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China 3.Chinese Acad Sci, Shanghai Astron Observ, Shanghai 200030, Peoples R China 4.Univ Massachusetts, Dept Astron, Amherst, MA 01003 USA 5.Nanjing Univ, Sch Astron & Space Sci, Nanjing 210023, Jiangsu, Peoples R China 6.Boston Univ, Dept Astron, Boston, MA 02215 USA 7.MIT, Kavli Inst Astrophys & Space Res, Cambridge, MA 02139 USA 8.Columbia Univ, Columbia Astrophys Lab, New York, NY 10027 USA 9.Max Planck Inst Extraterr Phys, D-85741 Garching, Germany |
| 推荐引用方式 GB/T 7714 | Li, Ya-Ping,Yuan, Feng,Yuan, Qiang,et al. STATISTICS OF X-RAY FLARES OF SAGITTARIUS A(star): EVIDENCE FOR SOLAR-LIKE SELF-ORGANIZED CRITICALITY PHENOMENA[J]. ASTROPHYSICAL JOURNAL,2015,810(1):1. |
| APA | Li, Ya-Ping.,Yuan, Feng.,Yuan, Qiang.,Wang, Q. Daniel.,Chen, P. F..,...&Dexter, Jason.(2015).STATISTICS OF X-RAY FLARES OF SAGITTARIUS A(star): EVIDENCE FOR SOLAR-LIKE SELF-ORGANIZED CRITICALITY PHENOMENA.ASTROPHYSICAL JOURNAL,810(1),1. |
| MLA | Li, Ya-Ping,et al."STATISTICS OF X-RAY FLARES OF SAGITTARIUS A(star): EVIDENCE FOR SOLAR-LIKE SELF-ORGANIZED CRITICALITY PHENOMENA".ASTROPHYSICAL JOURNAL 810.1(2015):1. |
入库方式： OAI收割
来源：上海天文台
浏览0
下载0
收藏0
其他版本
除非特别说明，本系统中所有内容都受版权保护，并保留所有权利。