Gravity Group Seminar, Charles Romero | UPenn "High resolution SZ observations of galaxy clusters"

Tue, Jun 4, 2019, 2:00 pm
102 Jadwin Hall (Joseph Henry Room)

The Sunyaev-Zel'dovich (SZ) effect was first proposed in 1970, but it took until the 1990s before SZ observations became possible without enormous effort. However, the resolution of these observations were always above an arcminute, and thus SZ measurements were primarily sought for determining global properties of the intracluster medium (ICM) of galaxy clusters. Primary drivers of SZ observations were (1) constrain growth of structure through cluster surveys, (2) determine the Hubble parameter from SZ and X-ray observations, (3) constrain the gas-mass fraction, and (4) look for peculiar velocities of galaxy clusters. These are still drivers today, and high-resolution SZ observations may yield improvements in these fields. However, in the past decade high-resolution SZ observations have opened up the door to ICM physics once relegated to X-ray observations. I'll highlight a bit of the past, present, and future of high-resolution SZ measurements in the context of ICM astrophysics.