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SUMMARY:Probing Cosmic Dawn with the most distant galaxies - Nicolas Lapor
 te (Cavendish)
DTSTART:20200529T103000Z
DTEND:20200529T113000Z
UID:TALK142237@talks.cam.ac.uk
CONTACT:Martin Haehnelt
DESCRIPTION:One of the key question of modern extragalactic astronomy is t
 o determine when the first generation of stars and galaxies started to bat
 he the Universe in light. According to the most recent simulations\, this 
 "Cosmic Dawn" occurred ~200 Myr after the Big-Bang (corresponding to a red
 shift of z~20). The recent claim of the detection of a redshifted 21cm abs
 orption in the CMB suggests that the formation of the first generation of 
 stars and galaxies happened at z~17.  However\, observing these galaxies a
 t very high-redshift (z>11) is well beyond the capabilities of current gro
 und-based and space instruments. However recently high-redshift galaxies d
 iscovered at fascinating distances  z>8\,  were interpreted  in terms of a
 ges and intense star formation histories. These galaxies are revealed matu
 re with ages of 500 million years\, starting just after the Big-Bang. Such
  early systems with significant stellar masses and star formation rates wh
 ich decline with time are not easily reproduced by contemporary numerical 
 simulations. The physics of these galaxies (mass growth\, dissipation by i
 onizing energy\, gas and electronic densities) are the main objectives\, t
 o be related to dark matter haloes and to the growth of supermassive black
  holes. In this talk I will review the latest results on the search for an
 d study of the most distant sources\, in terms of physical properties (age
 \, SFR\, stellar mass\, dust mass) and on their contribution to the reioni
 sation budget. 
LOCATION:via zoom 
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