Black hole Spin in Sw J1644+57 and Sw J2058+05

Details Black hole Spin in Sw J1644+57 and Sw J2058+05 Black hole Spin in Sw J1644+57 and Sw J2058+05

2011-08-15

arxiv.org/abs/1108.3115v2

ApJ(2011), 740, L27

Astronomy and Astrophysics

Astrophysics

High Energy Astrophysical Phenomena

5 pages, 1 figures; Minor modifications; Accepted for publication in ApJ Letters

Scientific paper

10.1088/2041-8205/740/1/L27

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, possibly triggered by a tidal disruption event. 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 black holes. We attribute jet launching to the Blandford-Znajek mechanism, and use the available data to constrain the black hole spin parameter for the two events. It is found that the two black holes indeed carry a moderate to high spin, suggesting that black hole spin is likely the crucial factor behind the Sw J1644+57 - like events.

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