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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)
2012
发表期刊ASTROPHYSICAL JOURNAL
卷号760期号:1页码:63
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.
关键词accretion, accretion disks black hole physics gamma-ray burst: general
学科领域Astronomy & Astrophysics
DOI10.1088/0004-637X/760/1/63
收录类别SCI
WOS记录号WOS:000310922200063
引用统计
被引频次:22[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/224408
专题粒子天体物理中心
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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.
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