RADIAL ANGULAR MOMENTUM TRANSFER AND MAGNETIC BARRIER FOR SHORT-TYPE GAMMA-RAY-BURST CENTRAL ENGINE ACTIVITY

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	RADIAL ANGULAR MOMENTUM TRANSFER AND MAGNETIC BARRIER FOR SHORT-TYPE GAMMA-RAY-BURST CENTRAL ENGINE ACTIVITY
	Liu, T; Liang, EW; Gu, WM; Hou, SJ; Lei, WH; Lin, L; Dai, ZG; Zhang, SN; Zhang SN(张双南)
刊名	ASTROPHYSICAL JOURNAL
	2012
卷号	760 期号:1 页码:63
关键词	accretion black hole physics gamma-ray burst: general accretion disks
英文摘要	Soft extended emission (EE) following initial hard spikes up to 100 s was observed with Swift/BAT for about half of known short-type gamma-ray bursts (SGRBs). This challenges the conversional central engine models of SGRBs, i.e., compact star merger models. In the framework of black-hole-neutron-star merger models, we study the roles of radial angular momentum transfer in the disk and the magnetic barrier around the black hole in the activity of SGRB central engines. We show that radial angular momentum transfer may significantly prolong the lifetime of the accretion process, which may be divided into multiple episodes by the magnetic barrier. Our numerical calculations based on models of neutrino-dominated accretion flows suggest that disk mass is critical for producing the observed EE. In the case of the mass being similar to 0.8 M-circle dot, our model can reproduce the observed timescale and luminosity of both the main and the EE episodes in a reasonable parameter set. The predicted luminosity of the EE component is lower than the observed EE within about one order of magnitude and the timescale is shorter than 20 s if the disk mass is similar to 0.2 M-circle dot. Swift/BAT-like instruments may be not sensitive enough to detect the EE component in this case. We argue that the EE component could be a probe for the merger process and disk formation for compact star mergers.
学科主题	Astronomy & Astrophysics
收录类别	SCI
WOS记录号	WOS:000310922200063
公开日期	2016-05-03
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/224408]
专题	高能物理研究所_粒子天体物理中心
推荐引用方式 GB/T 7714	Liu, T,Liang, EW,Gu, WM,et al. RADIAL ANGULAR MOMENTUM TRANSFER AND MAGNETIC BARRIER FOR SHORT-TYPE GAMMA-RAY-BURST CENTRAL ENGINE ACTIVITY[J]. ASTROPHYSICAL JOURNAL,2012,760(1):63.
APA	Liu, T.,Liang, EW.,Gu, WM.,Hou, SJ.,Lei, WH.,...&张双南.(2012).RADIAL ANGULAR MOMENTUM TRANSFER AND MAGNETIC BARRIER FOR SHORT-TYPE GAMMA-RAY-BURST CENTRAL ENGINE ACTIVITY.ASTROPHYSICAL JOURNAL,760(1),63.
MLA	Liu, T,et al."RADIAL ANGULAR MOMENTUM TRANSFER AND MAGNETIC BARRIER FOR SHORT-TYPE GAMMA-RAY-BURST CENTRAL ENGINE ACTIVITY".ASTROPHYSICAL JOURNAL 760.1(2012):63.