Clusters of galaxies are the largest and most massive, gravitational bound structures in the Universe.

Lying at the nodes of the cosmic web filaments in the present highly structured Universe, clusters of galaxies are at crossroads of cosmology and astrophysics: on one side they trace cosmic evolution providing information on structure formation, and are powerful tools to test the underlying cosmological models; on the other side they are unique astrophysical laboratories, ideal for the study of plasma physics, thermal and non-thermal processes, turbulence, magnetic fields, dark matter, etc.

Clusters are complex structures. They typically contain from tens to thousands galaxies. Nonetheless only few percent of their total mass is in the form of optical galaxies. Dark matter is the dominant (about 80%) component of clusters. About 15-20% of the total mass consists of diffuse, hot, metal-enriched, X-ray emitting plasma permeating the space between the galaxies: the intracluster medium (ICM).

Our group is active in exploiting data from various X-ray satellites (ROSAT, Beppo-SAX and XMM-Newton, Chandra, NuStar) to inspect in details clusters’ physics and evolution, aided also by observations at other wavelengths: radio (e.g. LOFAR), millimeter (through the SZ effect, e.g. Planck) and optical. We are involved in several projects like XCOP, XMM Cluster Heritage Project, XXL.

Our main research projects include:

Thermodynamical properties of the ICM

Ghirardini et al. 2019
Ettori et al. 2019
Ghizzardi, Rossetti, & Molendi 2010






Non-thermal phenomena in the ICM and particle acceleration at shock fronts/relics

Botteon et al. 2018
Venturi et al. 2017
Botteon et al. 2016a
Botteon et al. 2016b
Gastaldello et al. 2015





Outskirts of nearby galaxy clusters

Eckert et al. 2019
Tchernin et al. 2016
Eckert et al. 2015
Eckert et al. 2012




Metal enrichment of the ICM

Molendi et al. 2016
Ghizzardi et al. 2014
Leccardi et al. 2010
Gastaldello et al. 2010
De Grandi & Molendi 2009
De Grandi et al. 2004
Gastaldello et al. 2002




Galaxy clusters formation and accretion mechanisms (group infalls, ram pressure stripping…)

Eckert et al. 2017
De Grandi et al. 2016





Construction and properties of representative samples of galaxy clusters

Rossetti et al. 2017
Rossetti et al. 2016






Evolution of the cluster population

Rossetti et al. 2011
Leccardi et al. 2010
Rossetti et al. 2010






Cold fronts and sloshing (at all scales)

Ghizzardi et al. 2014
Gastaldello et al. 2013
Rossetti et al. 2013
Roediger et al. 2012
Ghizzardi, Rossetti, & Molendi 2010



Mass estimations for galaxy clusters

Ettori et al. 2019
Ettori et al. 2010
Gastaldello et al. 2007
Buote et al. 2007







AGN feedback

Gastaldello et al. 2009
Gastaldello et al. 2008












Galaxy groups

Gastaldello et al. 2014
David et al. 2014
Gastaldello et al 2013
Gastaldello et al. 2009









Contacts



Silvano Molendi
Fabio Gastaldello
Simona Ghizzardi
Mariachiara Rossetti

Sabrina De Grandi











Page maintained by Simona Ghizzardi Last modified: 29-4-2019