STATISTICS OF X-RAY FLARES OF SAGITTARIUS A(star): EVIDENCE FOR SOLAR-LIKE SELF-ORGANIZED CRITICALITY PHENOMENA

	STATISTICS OF X-RAY FLARES OF SAGITTARIUS A(star): EVIDENCE FOR SOLAR-LIKE SELF-ORGANIZED CRITICALITY PHENOMENA
	Li, Ya-Ping 1,2; Yuan, Feng1,2,3 ; Yuan, Qiang 4; Wang, Q. Daniel 4; Chen, P. F.5; Neilsen, Joseph 6,7; Fang, Taotao 1,2; Zhang, Shuo 8; Dexter, Jason 9
刊名	ASTROPHYSICAL JOURNAL
	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
内容类型	期刊论文
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.