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Physics Department Colloquia

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Events on Friday, November 15th, 2019

Black Hole Ergomagnetospheres, Electromagnetic Jets and Ejection Disks
Time: 3:30 pm
Place: 2241 Chamberlin Hall
Speaker: Roger Blandford, KIPAC, Stanford
Abstract: Recent, remarkable images made by the EHT collaboration exhibit a ring of emission, presumably orbiting a six billion solar mass black hole. It is proposed that what is observed is not a gas torus but an extensive “ ergomagnetosphere" that connects mechanically to a much larger ``ejection disk’’ and that, in sources like M87, the electromagnetic jets and the disk are mostly powered by black hole spin, not accretion. Implications for general active galactic nuclei and other sources of relativistic jets will be briefly discussed.
Host: Cary Forest
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