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2020-10-23 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
 
Abstract: 
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.
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