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Stergios Amarantidis (IRAM-Wisc-CAS Seminar)
November 14 @ 9:00 am - 10:00 am
This seminar series is a collaboration between institutes in France, Spain and Germany, and our department. This is a very special way to connect and share scientific results. These joint seminars take place on the second Monday of each month at 16h French/German local time, unless stated otherwise. So feel free to mark this in your agendas for the future.
These seminars are open to the entire department.
One of the fundamental topics in extragalactic astronomy concerns the formation and evolution of galaxies through cosmic time. A common approach for shedding more light on this subject is the exploration of the young stages of the Universe, when the first stars and Super Massive Black Holes (SMBHs) were formed and therefore started ionising the intergalactic medium. This Epoch of Re-ionisation (EoR) is considered one of the key areas of extragalactic research that only recently we were able to explore, mostly due to the growing number of identified high-redshift Active Galactic Nuclei (AGNs). In this talk, I will focus on the exploration of the EoR and the SMBH/AGN population, both from the theoretical and observational point of view. Regarding the former, I will introduce the results from eight state-of-the-art cosmological galaxy formation and evolution models and in particular their predictions on the number of AGNs that the current and future surveys would observe at the EoR. Furthermore, employing one of these models, I will present a simulated future possible survey of 1 deg2 that the next-generation telescope Athena could observe. Having these theoretical predictions in hand, one can aim to identify high-redshift radio galaxies in deep and well-studied surveys. In this regard, I will present results from the application of two selection criteria that are widely used and were successful in the past in detecting high-redshift galaxies, aiming to provide further evidence regarding their efficiency of studying the EoR.