A fierce new challenge: unveiling the connection between the first galaxies and reionization
DIPC Seminars
- Speaker
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Enrico Garaldi, Max Planck Institut, Germany
- When
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2022/11/09
16:00 - Place
- Hybrid Seminar: Donostia International Physics Center
- Add to calendar
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iCal
The formation of the first galaxies in the Universe is the new frontier of
both galaxy formation and reionization studies. In fact, we are starting to
directly observe primeval galaxies thanks to the James Webb Space Telescope,
and soon we will witness the reionization process through 21cm intensity
mapping experiments. This unique moment creates a fierce new challenge, namely
to simultaneously understand in a unique and coherent picture the processes of
galaxy formation and reionization, and – crucially – their connection. The
latter, in particular, has escaped past numerical efforts. In this talk I will
introduce an years-long effort geared toward achieving such comprehensive
picture, recently culminated in the Thesan suite of cosmological radiation-
magneto-hydrodynamical simulations. I will briefly introduce the features of
Thesan, highlighting the successes and failures of its physical model, and
then focus on probes of the mesoscales between galaxies and IGM. Thesan can,
for the first time, reproduce the modulation of the Lyman-alpha flux around
galaxies, and explain its physical origin. This opens up a new avenue to
constrain sources and timing of reionization. Finally, I will outline the
future path towards a more comprehensive understanding of the first billion
years of the Universe.
Host: Marcos Pellejero
ZOOM: ** **