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INAF - Astronomical Observatory of Padova

INAF - Astronomical Observatory of Padova is one of the main structures of the National Institute of Astrophysics (INAF). The main activity of the Observatory is to perform scientific research in various  fields of Astrophysics. The Observatory also contributes to  advanced education, assists in the dissemination of knowledge and implements project of education and outreach of Astronomy.

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INAF - Osservatorio Astronomico di Padova


Seminario Dr. Gabriele Pezzulli
26.04.2019 - 26.04.2019
Sala jappelli - Osservatorio Astronomico di Padova - Padova



Venerdi 26 Aprile 2019, h. 11:30 
 Aula Jappelli Osservatorio Astronomico

Gabriele Pezzulli 

    ETH, Zurigo

Constraining feedback models with Giant Ly-alpha nebulae at z~3



Galaxy formation models rely on mechanisms to keep the majority of baryons outside of the main body of galaxies. Different scenarios, however, make different predictions about where these "galactic missing baryons" should be found: relatively close-by in the so-called circumgalactic medium (CGM), or very far away in the diffuse intergalactic medium (IGM). A powerful way to constrain different models is therefore to seek observational determinations of the CGM mass and baryon fraction, especially at high z, where most of feedback processes are expected to take place. A wealth of information has now become available from direct mapping of the CGM of high-z galaxies in Lya emission. I will show how MUSE observations of Giant Ly-alpha nebulae around bright QSOs allow to determine, within some uncertainties, the total baryon content of the CGM of massive haloes at z~3. Our current results indicate a substantial fraction of baryons to be retained within the virial radius of these haloes, possibly favouring maintenance modes of feedback over models that require a very high efficiency of ejective processes. I will conclude by discussing how remaining uncertainties can be alleviated by future observations and theoretical modelling.


Sala jappelli - Osservatorio Astronomico di Padova
vicolo Osservatorio 5


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