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Speaker: Aleksandra Kusiak (Columbia) – Title: Probing the Ionized Gas Thermodynamics in Distant Galaxies with the Sunyaev-Zel’dovich Effect
November 14, 2023 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: November 14, 2023
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Aleksandra Kusiak (Columbia)
Title: Probing the Ionized Gas Thermodynamics in Distant Galaxies with the Sunyaev-Zel’dovich Effect
Abstract: The Sunyaev-Zel’dovich Effect—the Doppler boost of low-energy Cosmic Microwave Background photons scattering off free electrons in galaxies and clusters in the late Universe—is an excellent probe of ionized gas residing in distant galaxies. Its two main constituents are the kinematic SZ effect (kSZ), where electrons have a non-zero line-of-sight (LOS) velocity and which probes the electron momentum, and the thermal SZ effect (tSZ), where electrons have high energies due to their temperature, and which probes the electron integrated pressure. These two effects provide complementary information necessary to constrain the thermodynamic profile of gas residing in distant galaxies, which can be further used to understand feedback processes, a necessary ingredient to describe the evolution of the large-scale structure in our Universe and galaxy formation. Both tSZ and kSZ can be measured in cross-correlation with large-scale structure, e.g., galaxies.
In this talk, I will discuss my past and ongoing measurements of the SZ-galaxy cross-correlations with unWISE galaxies, including the projected-fields kSZ. unWISE is a galaxy catalog containing over 500 million galaxies on the full sky and consists of three subsamples of mean redshifts z=0.5, 1.1, 1.5, whose halo occupation distribution I have already constrained. If time permits, I will also present my ongoing work on mitigating foregrounds in the SZ cross-correlations, particularly the Cosmic Infrared Background (CIB).
Join Zoom Meeting
https://lbnl.zoom.us/j/95679892182?pwd=RU5xU2dDRFNabnR1U3pQMklkYWFIdz09
Meeting ID: 956 7989 2182
Passcode: 169037