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SUMMARY:CANCELLED - Using our Galactic center supermassive black hole Sgr 
 A* as a testbed for theories of accretion - Sera Markoff\, University of A
 msterdam
DTSTART:20150129T163000Z
DTEND:20150129T173000Z
UID:TALK57139@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:Sgr A&#42\; is the weakest accreting black hole we have ever o
 bserved\, yet it is\nnot a particularly unique object.   We know that the 
 majority of galaxies\nharbor nuclear black holes more like Sgr A&#42\; tha
 n bright active galactic\nnuclei (AGN)\, thus our Galactic center represen
 ts a dominant stage in the\n"typical"  life cycle of a spiral galaxy.   I 
 will discuss our current\nunderstanding of accretion around Sgr A&#42\;\, 
 the only source so far where we\ncan directly image near-event horizon sca
 les\, and where semi-analytical\nmodels are starting to agree with sophist
 icated general relativistic\nmagnetohydrodynamical simulations.   These re
 sults provide a baseline for\naddressing several major questions relevant 
 to the wider impact of black\nholes in the universe\, such as feedback in 
 galaxies and clusters\, or high\nenergy particle acceleration.   I will pr
 esent some recent examples of how\nSgr A&#42\; is elucidating key physics 
 relevant for black holes at all mass\nscales.
LOCATION:Sackler Lecture Theatre\, IoA (tea at 4:00 pm)
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