Measurements of the Thermal Sunyaev-Zel'dovich Effect with ACT and DESI Luminous Red Galaxies
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arXiv
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| Natura: | Preprint |
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2025
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| author | Liu, R. Henry Ferraro, Simone Schaan, Emmanuel Zhou, Rongpu Aguilar, Jessica Nicole Ahlen, Steven Battaglia, Nicholas Bianchi, Davide Brooks, David Claybaugh, Todd Cole, Shaun Coulton, William R. de la Macorra, Axel Dey, Arjun Fanning, Kevin Forero-Romero, Jaime E. Gaztañaga, Enrique Gong, Yulin Gontcho, Satya Gontcho A Gruen, Daniel Gutierrez, Gaston Hadzhiyska, Boryana Honscheid, Klaus Howlett, Cullan Kehoe, Robert Kisner, Theodore Kremin, Anthony Kusiak, Aleksandra Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Lokken, Martine Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Moodley, Kavilan Newman, Jeffrey A. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Pérez-Ràfols, Ignasi Guachalla, Bernardita Ried Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sifón, Cristóbal Sprayberry, David Tarlé, Gregory Vavagiakis, Eve M. Weaver, Benjamin Alan Wollack, Edward J. Zou, Hu |
| author_facet | Liu, R. Henry Ferraro, Simone Schaan, Emmanuel Zhou, Rongpu Aguilar, Jessica Nicole Ahlen, Steven Battaglia, Nicholas Bianchi, Davide Brooks, David Claybaugh, Todd Cole, Shaun Coulton, William R. de la Macorra, Axel Dey, Arjun Fanning, Kevin Forero-Romero, Jaime E. Gaztañaga, Enrique Gong, Yulin Gontcho, Satya Gontcho A Gruen, Daniel Gutierrez, Gaston Hadzhiyska, Boryana Honscheid, Klaus Howlett, Cullan Kehoe, Robert Kisner, Theodore Kremin, Anthony Kusiak, Aleksandra Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Lokken, Martine Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Moodley, Kavilan Newman, Jeffrey A. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Pérez-Ràfols, Ignasi Guachalla, Bernardita Ried Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sifón, Cristóbal Sprayberry, David Tarlé, Gregory Vavagiakis, Eve M. Weaver, Benjamin Alan Wollack, Edward J. Zou, Hu |
| contents | Cosmic Microwave Background (CMB) photons scatter off the free-electron gas in galaxies and clusters, allowing us to use the CMB as a backlight to probe the gas in and around low-redshift galaxies. The thermal Sunyaev-Zel'dovich effect, sourced by hot electrons in high-density environments, measures the thermal pressure of the target objects, shedding light on halo thermodynamics and galaxy formation and providing a path toward understanding the baryon distribution around cosmic structures. We use a combination of high-resolution CMB maps from the Atacama Cosmology Telescope (ACT) and photometric luminous red galaxy (LRG) catalogues from the Dark Energy Spectroscopic Instrument (DESI) to measure the thermal Sunyaev-Zel'dovich signal in four redshift bins from $z=0.4$ to $z=1.2$, with a combined detection significance of 19$σ$ when stacking on the fiducial CMB Compton-$y$ map. We discuss possible sources of contamination, finding that residual dust emission associated with the target galaxies is important and limits current analyses. We discuss several mitigation strategies and quantify the residual modelling uncertainty. This work complements closely related measurements of the kinematic Sunyaev-Zel'dovich and weak lensing of the same galaxies. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2502_08850 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Measurements of the Thermal Sunyaev-Zel'dovich Effect with ACT and DESI Luminous Red Galaxies Liu, R. Henry Ferraro, Simone Schaan, Emmanuel Zhou, Rongpu Aguilar, Jessica Nicole Ahlen, Steven Battaglia, Nicholas Bianchi, Davide Brooks, David Claybaugh, Todd Cole, Shaun Coulton, William R. de la Macorra, Axel Dey, Arjun Fanning, Kevin Forero-Romero, Jaime E. Gaztañaga, Enrique Gong, Yulin Gontcho, Satya Gontcho A Gruen, Daniel Gutierrez, Gaston Hadzhiyska, Boryana Honscheid, Klaus Howlett, Cullan Kehoe, Robert Kisner, Theodore Kremin, Anthony Kusiak, Aleksandra Lambert, Andrew Landriau, Martin Guillou, Laurent Le Levi, Michael Lokken, Martine Manera, Marc Martini, Paul Meisner, Aaron Miquel, Ramon Moodley, Kavilan Newman, Jeffrey A. Niz, Gustavo Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Pérez-Ràfols, Ignasi Guachalla, Bernardita Ried Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Seo, Hee-Jong Sifón, Cristóbal Sprayberry, David Tarlé, Gregory Vavagiakis, Eve M. Weaver, Benjamin Alan Wollack, Edward J. Zou, Hu Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies Cosmic Microwave Background (CMB) photons scatter off the free-electron gas in galaxies and clusters, allowing us to use the CMB as a backlight to probe the gas in and around low-redshift galaxies. The thermal Sunyaev-Zel'dovich effect, sourced by hot electrons in high-density environments, measures the thermal pressure of the target objects, shedding light on halo thermodynamics and galaxy formation and providing a path toward understanding the baryon distribution around cosmic structures. We use a combination of high-resolution CMB maps from the Atacama Cosmology Telescope (ACT) and photometric luminous red galaxy (LRG) catalogues from the Dark Energy Spectroscopic Instrument (DESI) to measure the thermal Sunyaev-Zel'dovich signal in four redshift bins from $z=0.4$ to $z=1.2$, with a combined detection significance of 19$σ$ when stacking on the fiducial CMB Compton-$y$ map. We discuss possible sources of contamination, finding that residual dust emission associated with the target galaxies is important and limits current analyses. We discuss several mitigation strategies and quantify the residual modelling uncertainty. This work complements closely related measurements of the kinematic Sunyaev-Zel'dovich and weak lensing of the same galaxies. |
| title | Measurements of the Thermal Sunyaev-Zel'dovich Effect with ACT and DESI Luminous Red Galaxies |
| topic | Cosmology and Nongalactic Astrophysics Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2502.08850 |