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SUMMARY:Who Turned on the Lights?  Statistics and Kinematics of Lyman-alph
 a Blobs - Ann Zabludoff\, University of Arizona
DTSTART:20110629T121500Z
DTEND:20110629T124500Z
UID:TALK31924@talks.cam.ac.uk
CONTACT:Ben Davies
DESCRIPTION:Lyman-alpha blobs are mysterious objects in the distant Univer
 se extending over 50-100 kpc.  Because these gigantic gas clouds have been
  detected only in optically thick and highly resonant Lyman-alpha emission
 \, their power source remains a puzzle.  Due to the rarity of blobs\, the 
 form of their evolution to the present day is also unknown.  We are conduc
 ting multi-wavelength\, deep\, and large area surveys to identify tens of 
 blobs at redshifts ~2-5.  These surveys have now produced the first constr
 aints on blob clustering\, showing that blobs occupy massive halos likely 
 to evolve into rich clusters today.  Blobs are not only tracers of the mos
 t overdense environments at early times\, but also may mark the sites of b
 rightest cluster galaxy formation.  By targeting the optically thin Halpha
  line\, we have obtained the first measurements of gas kinematics in blobs
 \, excluding strong outflows as the source of Lyman alpha emission.\n\n\n
LOCATION:Martin Ryle Large Meeting Room\, KICC
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