[astroseminar at Sapienza] 31/05/2017 at 16:00 Stefano Ettori

[Marco De Petris]

Title: X-ray, Sunyeav-Zel'dovich signal and dark matter in galaxy 
clusters
Speaker: Stefano Ettori
Institute: INAF Osservatorio Astronomico, Bologna ITALY
Date: Wednesday, 31 May 2017
Time: 4:00 pm
Location: Aula Conversi, Marconi Building, Dept. of Physics, Sapienza 
University

Abstract:
The distribution of the gravitating and baryonic mass in galaxy 
clusters is
key information to use them as astrophysical laboratories and 
cosmological
probes. I'll discuss the current status in reconstructing the radial 
profiles
of the gas mass, the total mass and other thermodynamical properties 
from
observations via X-rays and the Sunyeav-Zeldovich effect, highlighting 
the
present limitations and biases, in particular in the clusters' 
outskirts and
at high-redshift, where we have obtained the first constraint on the
concentration-mass relation at z>0.7 from X-ray analysis only.
I'll show how the best constraints available on the distribution of the
baryonic and hydrostatic mass in nearby clusters we have recently 
obtained
are in conflict with scenarios alternative to the cold dark matter. 
I'll
elucidate how Athena, the next-generation X-ray observatory and ESA-L2
mission, will address these issues.

web: https://agenda.infn.it/conferenceDisplay.py?confId=13350

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-----------------------------------------------------------------
dr. Marco De Petris
Dip. Fisica - Univ. di Roma "La Sapienza"
Piazzale Aldo Moro 2 - 00185 Roma - ITALY
tel: (+39) 06 49914690 - fax: (+39) 06 4957697
e-mail: marco.depetris at roma1.infn.it
http://oberon.roma1.infn.it/marco/MDP_webpage/
skype: marcodepe

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