PIRSA:24010083

Probing the Ionized Gas Thermodynamics in Distant Galaxies with the Sunyaev-Zel’dovich Effect

Kusiak, A. (2024). Probing the Ionized Gas Thermodynamics in Distant Galaxies with the Sunyaev-Zel’dovich Effect. Perimeter Institute. https://pirsa.org/24010083

Kusiak, Aleksandra. Probing the Ionized Gas Thermodynamics in Distant Galaxies with the Sunyaev-Zel’dovich Effect. Perimeter Institute, Jan. 18, 2024, https://pirsa.org/24010083 

          @misc{ pirsa_PIRSA:24010083,
            doi = {10.48660/24010083},
            url = {https://pirsa.org/24010083},
            author = {Kusiak, Aleksandra},
            keywords = {Cosmology},
            language = {en},
            title = {Probing the Ionized Gas Thermodynamics in Distant Galaxies with the Sunyaev-Zel{\textquoteright}dovich Effect},
            publisher = {Perimeter Institute},
            year = {2024},
            month = {jan},
            note = {PIRSA:24010083 see, \url{https://pirsa.org}}
          }

Aleksandra Kusiak

Columbia University

Talk number
PIRSA:24010083
Collection
Talk Type
Subject
Abstract

The Sunyaev-Zel’dovich Effect—the Doppler boost of low-energy Cosmic Microwave Background photons scattering off free electrons—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 line-of-sight 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 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. Both tSZ and kSZ can be measured in cross-correlation with large-scale structure. In this talk, I will discuss my past and ongoing measurements of the SZ-galaxy cross-correlation with unWISE galaxies, where to measure the kSZ effect I use the projected-fields estimator. 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 work on mitigating foregrounds in the SZ cross-correlations, particularly the Cosmic Infrared Background (CIB).

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