[astroseminar at Sapienza] Gentle Reminder: Fifth online QUID ULTRA colloquium by Roberto Maiolino, today at 16:30

[raffaella.schneider at roma1.infn.it]

Dear Colleagues,

this is to gently remind you that the fifth online colloquium of the series: 

Quid Ultra? Frontiers and Controversies in Astrophysics 

will be today at 16:30. You can find all the details below and the updated program 
for future colloquia at the link:  https://www.quidultra.it <https://www.quidultra.it/>

Looking forward to seeing you soon, 

Raffaella Schneider (on behalf of the SOC)
  
Prof. Raffaella Schneider
Dipartimento di Fisica "G. Marconi”
Senior Fellow, Scuola Superiore di Studi Avanzati Sapienza
Sapienza, Università di Roma
P.le A. Moro 2, 00185 Roma, Italy
raffaella.schneider at roma1.infn.it <mailto:raffaella.schneider at roma1.infn.it>

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May 18 2021 at 16:30

Roberto Maiolino (Cavendish Laboratory, University of Cambridge)

Title: Quenching star formation in galaxies

Abstract: 
In the local universe stars only make up about 7% of all baryons, indicating that star formation has been extremely inefficient 
across the cosmic epochs. Within this context, even more impressive is the fact that in a significant fraction of galaxies star 
formation has been totally “quenched”, resulting into the population of passive and quiescent local galaxies. Understanding 
what are the mechanisms responsible for suppressing or even quenching star formation in galaxies has been one of the main 
challenges of astrophysics in recent years and it is one of the research areas in which most of the efforts have been directed, 
both in terms of cosmological simulations and in terms of observing campaigns.
I will give an overview of the potential causes and physical processes that might be responsible for regulating or even 
leading to the complete suppression of star formation in galaxies. I will illustrate that there are a variety of possible culprits. 
Among these I will show that supernova explosions can play a role, but the energy injected in the interstellar and intergalactic 
medium by accreting supermassive black holes can have a truly dramatic effect on their host galaxies. The environment in 
which galaxies live (e.g. galaxy groups or clusters) can also play an important role, by suppressing star formation especially 
in satellite galaxies. I will discuss observational evidence for these various effects by using results from extensive 
multi-wavelength datasets. I will conclude by emphasizing open, outstanding problems and the possibility of tackling them 
with the next generation of observing facilities.

Join Zoom Meeting
https://uniroma1.zoom.us/j/89931306878?pwd=WG5RYlYyZzRSMzJsOFpSRHczWEFCZz09 <https://uniroma1.zoom.us/j/89931306878?pwd=WG5RYlYyZzRSMzJsOFpSRHczWEFCZz09>

Meeting ID: 899 3130 6878
Passcode: 419276
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