Abstract

Title: The Cosmic Thermal History Probed by Sunyaev-Zeldovich Effect Tomography

Speaker: Dr. Ryu Makiya (ASIAA)

Date: October 23 at 14:30

Location: R521, General Building II

We probe the evolution of mean thermal energy density of the universe by using the redshift-dependent amplitudes of the thermal Sunyaev-Zeldovich (SZ) effect background. We cross-correlate the sky intensity maps obtained by the Planck with the spectroscopic galaxy samples and measure the redshift evolution of SZ background. Our SZ measurements constrain the halo bias-weighted mean electron pressure, up to z∼1. Using our measurements of the SZ background, we find that thermal energy density \Omega_th accounts for about 80% of the kinetic energy of the baryons available for pressure in halos at z < 0.5.