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SUMMARY:Towards imaging the event horizon in the galactic centre - Heino F
 alcke (IMAPP\, Radboud University\, Nijmegen\, Netherlands)
DTSTART:20150609T130000Z
DTEND:20150609T140000Z
UID:TALK59212@talks.cam.ac.uk
CONTACT:David Titterington
DESCRIPTION:Black holes are theoretical predictions of Einstein’s Genera
 l Theory of Relativity\, where large amounts of matter are concentrated so
  much that even light cannot escape its gravitational attraction.  Thus\, 
 black holes mark singularities in space and time\, which are surrounded by
  an event horizon that allows matter and light to go inwards but never go 
 out again.  However\, do these supermassive black holes and their event ho
 rizons really exist?  The best place to test this is the centre of our own
  Milky Way.  Here a compact radio source with a mass of 4 million times th
 e mass of the sun seems to mark the central black hole of our galaxy\, pro
 viding by far the best evidence for existence of black holes in general.  
 Moreover\, its high-frequency radio\, near-infrared\, and X-ray emission s
 eem to come directly from event horizon scales.  With the help of advanced
  numerical general relativistic magneto-hydrodynamic simulations emission 
 and appearance of the source can be successfully modelled almost from firs
 t principles.  Using global mm-wave Very Long Baseline Interferometry (VLB
 I) experiments – an “Event Horizon Telescope” – it should be possi
 ble to even image the elusive event horizon of a black hole for the very f
 irst time.  All this we address within the framework of a new ERC-funded p
 roject\, BlackHoleCam\, which seeks to turn Sgr A* into a fundamental labo
 ratory for precision black hole astrophysics.\n
LOCATION:Martin Ryle Seminar Room\, Kavli Institute
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