[Astronomy seminar] Reminder: Astronomy departmental seminar Wednesday May 8 at 10:30am - Ivelin Georgiev (SU)

[Astronomy seminar announcements]

Dear all,

This is a reminder of the weekly SU astronomy departmental seminar that 
will take place in about 78 minutes, at 10:30am in room FC61 (AlbaNova 
building, 6th floor) and on zoom 
(https://stockholmuniversity.zoom.us/j/69370388905).
___________________

Speaker: Ivelin Georgiev (Stockholm University)
Title: Studies of the intergalactic medium during the Epoch of 
Reionization - Understanding observational probes with simulations
Event: https://indico.fysik.su.se/e/ivelin_georgiev 
<https://indico.fysik.su.se/e/ivelin_georgiev>

Abstract:
The first billion years of the Universe is a unique era, marked by the 
formation of the first stars, galaxies, and accreting black holes, which 
release ionising radiation into the intergalactic medium (IGM). As a 
result, these luminous sources initiate a period during which the cold 
and dense IGM, primarily consisting of neutral hydrogen (HI), is heated 
and ionised. We refer to this era as the Epoch of Reionization (EoR). It 
is a multi-scale event that evolves with time and depends on the nature 
of the astrophysical processes that govern the formation of stars and 
galaxies, as well as the fundamental cosmology that defines the 
properties of the large-scale IGM.

In this talk, I examine the various probes of the EoR with a focus on 
those explored in my PhD thesis. One key probe is the 21 cm signal 
emitted due to the hyperfine transition of HI atoms in the IGM. I 
discuss how we can decompose the terms comprising the 21 cm power 
spectrum and what this can tell us about the Universe on large scales. 
Moreover, I describe how we can relate this observable patchy kinetic 
Sunyaev-Zel'dovich effect, observed as a foreground to the primary 
Cosmic Microwave Background temperature anisotropies on small scales, in 
order to learn more about the properties of reionization. Lastly, I will 
show how the observables inferred from quasar data can tell us how the 
EoR concluded and the impact of Lyman Limit Systems on the process.

___________________

We look forward to seeing many of you there. Thanks!

Adur and Adélaïde

Upcoming Events:

2024-05-14 Gayathri Viswanath (**Seminar on TUESDAY**)
2024-05-17 Elena Khomenko
2024-05-24 Matteo Messa
2024-05-31 Oleg Kochukhov (**Last seminar before summer break**)

You can subscribe to the seminars calendar in:
https://ttt.astro.su.se/ical/astro-seminars.ics
(Please note that calendar can be subject to updates)
___________________

Join Zoom Meeting:
https://stockholmuniversity.zoom.us/j/69370388905
Meeting ID: 693 7038 8905
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