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CATEGORIES:Institute of Astronomy Colloquia
SUMMARY:Hydrogen Epoch of Reionization Array - Chris Caril
 li (Astrophysics\, Cambridge)
DTSTART;TZID=Europe/London:20161020T160000
DTEND;TZID=Europe/London:20161020T170000
UID:TALK67527AThttp://talks.cam.ac.uk
URL:http://talks.cam.ac.uk/talk/index/67527
DESCRIPTION:The Hydrogen Epoch of Reionization Array (HERA) is
  a low frequency experiment designed to study cosm
 ic reionization using the 21cm hyperfine line of n
 eutral hydrogen. Reionization corresponds to the l
 ast 'cosmic phase transition'\, when the neutral g
 as that pervaded the Universe post-recombination i
 s reionized by the light from the first stars and 
 black holes\, a few hundred million years after th
 e Big Bang. Cosmic reionization is one of the last
  frontiers in cosmology\nand studies of large scal
 e structure formation. The HI 21cm line has the po
 tential to be the most incisive probe of the physi
 cal processes\ndriving reionization. I will briefl
 y summarize the latest measurements of the evoluti
 on of the neutral fraction of the intergalactic me
 dium (IGM) during reionization. I will then review
  the physics\, techniques\, and challenges of HI 2
 1cm cosmology\, and present the latest limits on t
 he HI 21cm signal from the early Universe. Limits 
 from experiments such as PAPER in South Africa\, a
 re reaching astrophysically relevant sensitivities
 \, and setting interesting constraints on early he
 ating of the IGM. I will present an update of the 
 HERA project\, including\ndesign\, capabilities\, 
 and construction status\, as well as first light d
 ata from the array.\n\n
LOCATION:Sackler Lecture Theatre\, IoA (tea at 3:30 pm)
CONTACT:Simon Hodgkin
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