Most powerful gamma-ray bursts linked to black holes
- 18:23 04 November 2010 by David Shiga
The most powerful explosions in the universe are caused by the births of black holes rather than dense neutron stars called magnetars, new evidence confirms.
Gamma-ray bursts are blasts of high-energy radiation that arrive at Earth from all directions.
Bursts lasting longer than 2 seconds are thought to be related to the collapse of massive stars that fire out jets of matter at near light speed, emitting copious radiation in the process. When the jets happen to be pointed at Earth, they send a volley of gamma rays our way.
But exactly how these jets are generated is still unclear. If the star collapses to form a rapidly spinning neutron star with a powerful magnetic field, called a magnetar, it could violently stir up matter around it to produce jets.
Alternatively, if the star collapses to form a black hole, the jets might arise from the interaction of the black hole with matter spiralling into it. Either way, the tremendous rotational energy of the black hole or neutron star is thought to power the jets.
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