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SUMMARY:Observing and simulating the reionization period of the Universe. 
 - Dr Jonathan Chardin (IOA)
DTSTART:20170207T194500Z
DTEND:20170207T204500Z
UID:TALK70554@talks.cam.ac.uk
CONTACT:Andrew Sellek
DESCRIPTION:In this talk I will review the recent advance in our understan
 ding of the reionization period of the Universe.\nThe reionization period 
 of hydrogen is a key phase transition in the history of the Universe that 
 took place between about 200 millions years and one Giga-year after the Bi
 g-Bang.\nThis transition originates fron the formation of the first lumino
 us sources that emit UV photons capable of ionizing the hydrogen atoms res
 iding in the intergalactic medium.\nThe transition is spread in time and c
 omplete when the different ionized regions (HII regions) in expansion even
 tually overlap\, leading to a Universe that is completely ionized.\nThis t
 ransition is very important for our understanding of the galaxy formation 
 mechanism in the early Universe and to explain the morphology of the galax
 ies we see today.\nThe observation of this transition are still poorly con
 strained but a range of new campaigns are going to be undertaken to charac
 terize this epoch in details in the next decade.\nIn the meantime a lot of
  effort are deployed to perform numerical simulations of this transition i
 n order to prepare our understanding of the future observations.\nIn this 
 talk\, I will discuss the different observational probes and simulation te
 chniques that would help us to have a better understanding of the period o
 f reionization in the near future.\n\nAll talks and obsnights are free to 
 members (or cost £2 for non-members) – membership can be bought (£12 l
 ife\, £7 annual) at any of our events.
LOCATION:Wolfson Lecture Theatre\, Department of Chemistry
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