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SUMMARY:Feedback from Accreting Black Holes: The Importance of Momentum Dr
 iving - Jeremiah Ostriker\, Princeton
DTSTART:20120517T153000Z
DTEND:20120517T163000Z
UID:TALK34677@talks.cam.ac.uk
CONTACT:George Becker
DESCRIPTION:lack holes\, in the centers of galaxies\, are fed by accretion
  of ambient gas\, whenever gas reaches those central regions due either to
  mergers\, or as the result of normal stellar evolution. That gas will coo
 l and fall to the centers of the systems\, where it will induce starbursts
  and accretion events onto the black holes. This causes outbursts of UV fr
 om the BH discs\, X-rays from coronal gas and polar\, radiation driven win
 ds\, with the efficiencies in these three categories roughly 10-1\, 10-2 &
  10-3.  The mass\, momentum and energy in these outbursts can have dramati
 c consequences for the growth of the BH and for the ambient galaxy. Most A
 GN feedback treatments do not include the mass and momentum components. We
  follow these events with 1D\, 2D and 3D hydrodynamic codes. BH growth is 
 similar to what has been found by others\, but the momentum driving produc
 es much more energetic winds than does thermal feedback. Observable conseq
 uences include the AGN absorption lines\, shock accelerated\, synchrotron 
 emitting particles and wind driven bubbles in the IGM. In addition\, we fi
 nd that the feedback strongly inhibits inflow\, causing episodic accretion
 . The simulations help us to understand many phenomena\, including the bla
 ck hole stellar mass relation\, the paucity of gas in ellipticals\, and th
 e observed fact that most of the black holes found in galactic centers are
  found in the “off” state.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 4:00 pm)
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