Home Activities Seminars

Mar 11 (Mon), 2024
13:00 ~ 18:00
Pizzardo, Michele
Yoo, Jaewon
University of Turin
KDESci Group Meeting
1. Spectroscopic Surveys of Galaxy Clusters (Ken Rines, West Washington University ) Abstract : Clusters of galaxies are the largest gravitationally bound structures in the universe. We have conducted dense redshift surveys of clusters selected by a variety of methods. We compare dynamical masses to those found by gravitational lensing, X-ray, and SZ observations. Spectroscopic observations allow us to separate cluster members from background galaxies and to study the connections between cluster properties and the dynamical properties of individual galaxies. Redshift surveys have a unique ability to probe the infall regions of clusters where galaxies are bound but not yet virialized. I will describe our measurements of mass profiles extending into the infall regions and how we can use these to measure the mass accretion rates of clusters. Finally, I will preview how large surveys like eROSITA and DESI will dramatically improve our understanding of clusters. 2. Mapping the transformations of quiescent galaxies over the last 7 billion years of cosmic history (Ivana Dajanov, Saint Mary's University (Canada) ) Abstract : Comparisons of quiescent galaxies in the distant universe with their counterparts in the local volume show that the structure of galaxies continues to change well after they stop forming stars. The average size of quiescent population increases by a factor of a few between redshifts z~2 and z~0. In contrast to the existing surveys of high-redshift universe, at intermediate redshift (0.210^14 Msun and 0.01<=z<=1.04 to explore cluster growth. We locate distinct dynamical regions and estimate mass accretion rate (MAR). The MAR is correlated with cluster mass and redshift. The typical MAR ~ 10^4-10^5 Msun/yr. Dense spectroscopy of real clusters infall region will soon be a platform for applying and testing these model results.