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SUMMARY:The nature of the first galaxies and reionisation: challenges in t
 he era of SKA\, Roman and JWST - Anne Hutter (Groningen)
DTSTART:20211029T103000Z
DTEND:20211029T113000Z
UID:TALK163192@talks.cam.ac.uk
CONTACT:Martin Haehnelt
DESCRIPTION:The nature of the first galaxies driving the reionisation of t
 he intergalactic medium (IGM) and their imprint in the ionisation state of
  the intergalactic hydrogen gas remain outstanding questions in current as
 trophysics. With the upcoming launch of the James Webb Space Telescope (JW
 ST)\, the Nancy Grace Roman Space Telescope (Roman)\, and the Square Kilom
 etre Array (SKA)\, a vast amount of data will be collected that will revol
 utionise our understanding of the first galaxies. The number of detected e
 arly galaxies will increase greatly\, and the 21cm signal from the neutral
  hydrogen in the IGM will probe the ionised regions continuously growing a
 round the first galaxies in time and space.\nSemi-analytic models as well 
 as semi-numerical and numerical simulations provide a great avenue to unde
 rstand the characteristic signatures of galactic processes in these forthc
 oming galaxy and 21cm signal (IGM) observations during the Epoch of Reioni
 sation. In this context we have developed the Astraeus framework. Astraeus
  contains a large (230 Mpc box) and highly resolved simulation that couple
 s a semi-analytic model of early galaxy evolution with a semi-numerical re
 ionisation scheme self-consistently. I will introduce this model and use i
 t to discuss how radiative feedback from reionisation and the escape fract
 ion of HI ionising photons from galaxies leave traces in the light emitted
  by the galaxies and the 21cm signal. I will end by explaining how synergi
 sing galaxy and 21cm observables can constrain the reionisation process.
LOCATION:via zoom 
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