[AAA] Seminario Virtual Room DAS - UChile

[Rene A. Mendez]

Estimado/as

Les recuerdo que el Jueves 22 de Julio a las 12:15 hrs, tendremos 
seminario en el Departamento de Astronomía de la Universidad de Chile.

*Speaker*: Pratika Dayal
Kapteyn Astronomical Institute, The University of Groningen

*Title*: Early galaxy formation & its large-scale effects

*Abstract*: Galaxy formation in the first billion years mark a time of 
great upheaval in the history of the Universe: as the first sources of 
light, these galaxies ended the 'cosmic dark ages' and produced the 
first photons that could break apart the hydrogen atoms suffusing all of 
space starting the process of cosmic reionization. As the earliest 
building blocks, the galaxies that formed in the first billion years 
also determine the physical properties of all subsequent galaxy 
populations. However fully coupling galaxy formation with large-scale 
reionization remains a massive computational challenge as a result of 
the range in (mass and volume) scales required. I will start by 
introducing the Astraeus framework that is the largest (230 Mpc box) and 
most highly resolved (DM resolution mass of 10^6.9 solar masses) 
simulation to fully couple a semi-analytic model of galaxy formation 
with a semi-numerical scheme for reionization (feedback) to shed light 
on galaxy formation at cosmic dawn. I will then show how 
cross-correlations of 21cm data with the underlying galaxy population, 
in the forthcoming era of 21cm cosmology, will yield tantalizing 
constraints on the average intergalactic medium ionization state as well 
as the reionization topology (outside-in versus inside-out). Finally, I 
will try to give a flavour of how the assembly of early galaxies, 
accessible with the forthcoming James Webb Space Telescope, can provide 
a powerful testbed for Dark Matter models beyond "Cold Dark Matter".

Virtual room: 
https://uchile.zoom.us/j/89046359858?pwd=dURFTjIzbXU0NkNpdGFZb0sxRVZJdz09 
<https://uchile.zoom.us/j/89046359858?pwd=dURFTjIzbXU0NkNpdGFZb0sxRVZJdz09>

Rene A. Mendez
Seminar Coordinator
DAS/UChile - rmendez en uchile.cl <mailto:rmendez en uchile.cl>




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