BLACK HOLE SPIN IN Sw J1644+57 and Sw J2058+05

被引：52

作者：

Lei, Wei-Hua ^{[1
,2
]}

Zhang, Bing ^{[1
]}

机构：

[1] Univ Nevada, Dept Phys & Astron, Las Vegas, NV 89154 USA

[2] Huazhong Univ Sci & Technol, Sch Phys, Wuhan 430074, Peoples R China

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2011年 / 740卷 / 01期

基金：

美国国家科学基金会; 中国国家自然科学基金;

关键词：

accretion; accretion disks; black hole physics; magnetic fields; GAMMA-RAY BURST; TIDAL DISRUPTION; STELLAR DISRUPTION; GALACTIC NUCLEI; ACCRETION; EXTRACTION; OUTBURST; FLARES; ENERGY; MODEL;

D O I：

10.1088/2041-8205/740/1/L27

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

Recently, a hard X-ray transient event, Sw J1644+57, was discovered by the Swift satellite. It likely marks the onset of a relativistic jet from a supermassive black hole (BH), possibly triggered by a tidal disruption event (TDE). Another candidate in the same category, Sw J2058+05, was also reported. The low event rate suggests that only a small fraction of TDEs launch relativistic jets. A common speculation is that these rare events are related to rapidly spinning BHs. We attribute jet launching to the Blandford-Znajek mechanism and use the available data to constrain the BH spin parameter for the two events. It is found that the two BHs indeed carry a moderate to high spin, suggesting that BH spin is likely the crucial factor behind the Sw J1644+57-like events.

引用

页数：4

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