NEUTRINO-COOLED ACCRETION MODEL WITH MAGNETIC COUPLING FOR X-RAY FLARES IN GAMMA-RAY BURSTS

被引：27
作者：
Luo, Yang [1 ,2 ]
Gu, Wei-Min [1 ,2 ]
Liu, Tong [1 ,2 ]
Lu, Ju-Fu [1 ,2 ]
机构：
[1] Xiamen Univ, Dept Astron, Xiamen 361005, Fujian, Peoples R China
[2] Xiamen Univ, Inst Theoret Phys & Astrophys, Xiamen 361005, Fujian, Peoples R China
来源：
ASTROPHYSICAL JOURNAL | 2013年 / 773卷 / 02期
基金：
中国国家自然科学基金;
关键词：
accretion; accretion disks; black hole physics; gamma-ray burst: general; magnetic fields; ROTATING BLACK-HOLE; GENERAL-RELATIVITY; FLARING ACTIVITY; 1ST SURVEY; DISKS; ENERGY; JETS; ENGINE; FLOWS; SWIFT;
D O I：
10.1088/0004-637X/773/2/142
中图分类号：
P1 [天文学];
学科分类号：
0704 ;
摘要：
The neutrino-cooled accretion disk, which was proposed to work as the central engine of gamma-ray bursts, encounters difficulty in interpreting the X-ray flares after the prompt gamma-ray emission. In this paper, the magnetic coupling (MC) between the inner disk and the central black hole (BH) is taken into consideration. For mass accretion rates around 0.001 similar to 0.1 M-circle dot s(-1), our results show that the luminosity of neutrino annihilation can be significantly enhanced due to the coupling effects. As a consequence, after the gamma-ray emission, a remnant disk with mass M-disk less than or similar to 0.5 M-circle dot may power most of the observed X-ray flares with the rest frame duration less than 100 s. In addition, a comparison between the MC process and the Blandford-Znajek mechanism is shown on the extraction of BH rotational energy.
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页数：6
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