Global neutrino heating in hyperaccretion flows

	Global neutrino heating in hyperaccretion flows
	Luo, Shu 1,2; Yuan, Feng1,2,3
刊名	MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
	2013-05-01
卷号	431 期号:3 页码:2362-2370
关键词	accretion neutrinos accretion discs
英文摘要	The neutrino-dominated accretion flow (NDAF) with accretion rates. M = 0.01-10M(circle dot) s(-1) is a plausible candidate for the central engine of gamma-ray bursts (GRBs). This hyperaccretion disc is optically thin to neutrinos in the radial direction; therefore, the neutrinos produced at one radius can travel for a long distance in the disc. Those neutrinos can thus be absorbed with certain probability by the disc matter at the other radius and heat the disc there. The effect of this 'global neutrino heating' has been ignored in previous works and is the focus of this paper. We find that around the 'ignition' radius r(ign), the global neutrino heating rate could be comparable to or even larger than the local viscous heating rate and thus it must be an important process. Two possible consequences are in order if the 'global neutrino heating' is taken into account: (i) the temperature of the disc is slightly raised and the 'ignition' radius r(ign) slightly shifts to a larger radius, both lead to the increase of the total neutrino flux; (ii) what is more interesting is that the temperature of the ADAF just beyond r(ign) may be raised above the virial temperature; thus, the accretion will be suppressed. In this case, the activity of the black hole is expected to oscillate between active and inactive phases. The time-scale of the active phases is estimated to be similar to 1 s. If the time-scale of the inactive phase is comparable to or less than this value, this intermittent activity may explain the slow variability component of the GRBs. Self-consistent global calculations of NDAFs with the 'global neutrino heating' included are required in the future to more precisely evaluate this effect.
WOS标题词	Science & Technology ; Physical Sciences
类目[WOS]	Astronomy & Astrophysics
研究领域[WOS]	Astronomy & Astrophysics
关键词[WOS]	GAMMA-RAY BURSTS ; COOLED ACCRETION DISKS ; SELF-SIMILAR SOLUTION ; BLACK-HOLES ; DOMINATED ACCRETION ; MODELS ; OUTFLOWS ; ORIGIN ; ENERGY
收录类别	SCI
语种	英语
WOS记录号	WOS:000318347500028
公开日期	2014-12-26
内容类型	期刊论文
源URL	[http://119.78.226.72//handle/331011/15419]
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, Key Lab Res Galaxies & Cosmol, Shanghai 200030, Peoples R China
推荐引用方式 GB/T 7714	Luo, Shu,Yuan, Feng. Global neutrino heating in hyperaccretion flows[J]. MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,2013,431(3):2362-2370.
APA	Luo, Shu,&Yuan, Feng.(2013).Global neutrino heating in hyperaccretion flows.MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY,431(3),2362-2370.
MLA	Luo, Shu,et al."Global neutrino heating in hyperaccretion flows".MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY 431.3(2013):2362-2370.