Dr
Stefano Ettori
(INAF-Osservatorio di Astrofisica e Scienza dello Spazio in Bologna)
04/06/2019 13:30
Galaxy clusters are dark-matter dominated systems enclosed in a volume that is a high-density microcosm of the rest of the universe.
What is their true mass scale? What are the statistical properties of the representative population? How does their detectability depend on baryon physics?
We have learned a lot on these fundamental questions with our current projects, like XMM-Newton Cluster...
Dr
Dominique Eckert
(University of Geneva)
04/06/2019 14:00
X-ray and Sunyaev-Zeldovich observations provide independent and complementary ways of determining the properties of the intracluster medium (ICM). Joint reconstructions of galaxy cluster properties combining X-ray and SZ data are clearly superior to similar analyzes based on one observable only, since the two methods have a different radial dependency and probe different thermodynamic...
Anna Silvia Baldi
(Sapienza University of Rome)
04/06/2019 14:30
The imaging of galaxy clusters through the Sunyaev-Zel'dovich effect is a valuable tool to probe
the thermal pressure of the intra-cluster gas especially in the outermost regions, where X-ray observations
suffer from photon statistics.
For the first time, we produce maps of the Comptonization parameter by applying a locally parametric algorithm for
sparse component separation to the...
Dr
Iacopo Bartalucci
(CEA Saclay)
04/06/2019 16:00
We present the dynamical properties and the individual spatially resolved radial mass profiles of a sample of 77 massive clusters in the [0.05-1] redshift range detected via the Sunyaev-Zel'dovich effect.
For the 5 clusters at z>0.9, we present a method to study such objects that optimally exploits information from XMM-Newton and Chandra observations. The combination of Chandra’s excellent...
Dr
Mariachiara Rossetti
(IASF-Milano/INAF)
04/06/2019 16:30
The Sunyaev-Zeldovich effect provides an observational window to the intracluster medium complementary to X-ray observations, and over the last few years has proved to be a mature technique to efficiently detect and characterize galaxy clusters. For instance, the Planck survey has mapped the whole microwave sky, detecting almost 2000 candidate massive clusters up to z~1, performing the first...
M.
Antonio Ferragamo
(Intistuto de Astrofísica de Canarias)
04/06/2019 17:00
The abundance of galaxy clusters, per unit of mass and redshift, is a very powerful tool in order to constrain cosmological parameters as the matter density Ωm, and the amplitude of the primordial fluctuation σ8. However, the cluster mass is not an observable. The multicomponent nature of galaxy clusters helps to bypass this problem. In fact, from the observation of each different cluster...
Prof.
Daisuke Nagai
(Yale University)
04/06/2019 17:30
High-resolution spectral imaging observations of the SZ effects promise to provide a vastly broaden view of structure and evolution of galaxy clusters, by enabling unique measurements of thermodynamic and kinematic properties of the cluster gas via thermal and kinematic SZ effects. One of the new frontiers includes the exploration of the extremely low-density regions in the outskirts of galaxy...
