Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 740, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/740/1/L27
Keywords
accretion, accretion disks; black hole physics; magnetic fields
Categories
Funding
- NSF [AST-0908362]
- NASA [NNX10AD48G]
- National Natural Science Foundation of China [11003004, 10873005]
- National Basic Research Program (973 Program) of China [2009CB824800]
- China Scholarship Program
- Direct For Mathematical & Physical Scien
- Division Of Astronomical Sciences [0908362] Funding Source: National Science Foundation
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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.
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