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SUMMARY:Hydrogen Epoch of Reionization Array - Chris Carilli (Astrophysics
 \, Cambridge)
DTSTART:20161020T150000Z
DTEND:20161020T160000Z
UID:TALK67527@talks.cam.ac.uk
CONTACT:Simon Hodgkin
DESCRIPTION:The Hydrogen Epoch of Reionization Array (HERA) is a low frequ
 ency experiment designed to study cosmic reionization using the 21cm hyper
 fine line of neutral hydrogen. Reionization corresponds to the last 'cosmi
 c phase transition'\, when the neutral gas that pervaded the Universe post
 -recombination is reionized by the light from the first stars and black ho
 les\, a few hundred million years after the Big Bang. Cosmic reionization 
 is one of the last frontiers in cosmology\nand studies of large scale stru
 cture formation. The HI 21cm line has the potential to be the most incisiv
 e probe of the physical processes\ndriving reionization. I will briefly su
 mmarize the latest measurements of the evolution of the neutral fraction o
 f the intergalactic medium (IGM) during reionization. I will then review t
 he physics\, techniques\, and challenges of HI 21cm cosmology\, and presen
 t the latest limits on the HI 21cm signal from the early Universe. Limits 
 from experiments such as PAPER in South Africa\, are reaching astrophysica
 lly relevant sensitivities\, and setting interesting constraints on early 
 heating of the IGM. I will present an update of the HERA project\, includi
 ng\ndesign\, capabilities\, and construction status\, as well as first lig
 ht data from the array.\n\n
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
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