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SUMMARY:Evolution of baryons in the high-redshift Universe - Hamsa Padmana
 bhan (Pune)
DTSTART:20151009T103000Z
DTEND:20151009T113000Z
UID:TALK60042@talks.cam.ac.uk
CONTACT:Martin Haehnelt
DESCRIPTION:The baryons in the post-reionization (z < 6) universe reside c
 hiefly in the partially (re)ionized\, low density intergalactic medium (IG
 M)\, with a small fraction in the neutral\, high column density systems su
 ch as galaxies and Damped Lyman Alpha absorbers (DLAs). The thermal evolut
 ion of the IGM offers valuable insights into the epochs of hydrogen and he
 lium reionization in the universe. I will describe our work towards constr
 aining the temperature-density relation of the IGM by using the Lyman-alph
 a forest of hydrogen absorption lines in the spectra of distant quasars\, 
 and the implications for reionization. In the post-reionization universe\,
  the high column density neutral hydrogen (HI) is preferentially probed ei
 ther through 21-cm emission surveys/intensity mapping experiments\, or Dam
 ped Lyman Alpha (DLA) absorption observations. There exist different analy
 tical prescriptions in the literature for modelling the 21-cm and DLA obse
 rvations of the post-reionization HI. I will describe the reconciliation o
 f these two differing approaches towards a consistent model of the distrib
 ution and evolution of HI across z ~ 0 - 4. The model has implications for
  the characteristic host halo masses of the DLAs and the power spectrum of
  21-cm intensity fluctuations.\n
LOCATION:Kavli LMR\, IoA
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