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| Natura: | Preprint |
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2025
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| Accesso online: | https://arxiv.org/abs/2511.23417 |
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| _version_ | 1866912974819557376 |
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| author | Gong, Yulin Gallardo, Patricio A. Bean, Rachel Moore, Jenna Vavagiakis, Eve M. Battaglia, Nicholas Hadzhiyska, Boryana Hsu, Yun-Hsin Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd Canning, Rebecca Devlin, Mark Doel, Peter de la Macorra, Axel Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gutierrez, Gaston Gontcho, Satya Gontcho A Guy, Julien Honscheid, Klaus Howlett, Cullan Liu, R. Henry Ishak, Mustapha Joyce, Dick Kremin, Anthony Lamman, Claire Levi, Michael Landriau, Martin Manera, Marc Meisner, Aaron Miquel, Ramon Niemack, Michael D. Nadathur, Seshadri Percival, Will Prada, Francisco Rossi, Graziano Guachalla, Bernardita Ried Sanchez, Eusebio Seo, Hee-Jong Sprayberry, David Schlegel, David Sifón, Cristóbal Schubnell, Michael Silber, Joseph Harry Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| author_facet | Gong, Yulin Gallardo, Patricio A. Bean, Rachel Moore, Jenna Vavagiakis, Eve M. Battaglia, Nicholas Hadzhiyska, Boryana Hsu, Yun-Hsin Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd Canning, Rebecca Devlin, Mark Doel, Peter de la Macorra, Axel Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gutierrez, Gaston Gontcho, Satya Gontcho A Guy, Julien Honscheid, Klaus Howlett, Cullan Liu, R. Henry Ishak, Mustapha Joyce, Dick Kremin, Anthony Lamman, Claire Levi, Michael Landriau, Martin Manera, Marc Meisner, Aaron Miquel, Ramon Niemack, Michael D. Nadathur, Seshadri Percival, Will Prada, Francisco Rossi, Graziano Guachalla, Bernardita Ried Sanchez, Eusebio Seo, Hee-Jong Sprayberry, David Schlegel, David Sifón, Cristóbal Schubnell, Michael Silber, Joseph Harry Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu |
| contents | We present a 9.3-sigma detection of the pairwise kinematic Sunyaev-Zeldovich (kSZ) effect by combining a sample of 913,286 Luminous Red Galaxies (LRGs) from the Dark Energy Spectroscopic Instrument Data Release 1 (DESI DR1) catalog and co-added Atacama Cosmology Telescope (ACT DR6) and Planck cosmic microwave background (CMB) temperature maps. This represents the highest-significance pairwise kSZ measurement to date. The analysis uses three ACT CMB temperature maps: co-added 150 GHz, total frequency maps, and a component-separated Internal Linear Combination (ILC) map, all of which cover 19,000 square degrees of the sky from Advanced ACTPol observations conducted between 2017 and 2022. Comparison of the results of these three maps serves as a consistency check for potential foreground contamination that may depend on the observation frequency. An estimate of the best-fit mass-averaged optical depth is obtained by comparing the pairwise kSZ curve with the linear-theory prediction of the pairwise velocity under the best-fit Planck cosmology, and is compared with predictions from simulations. This estimate serves as a reference point for future comparisons with thermal SZ-derived optical depth measurements for the same DESI cluster samples, which will be presented in a companion paper. Finally, we employ a machine-learning approach trained on simulations to estimate the optical depth for 456,803 DESI LRG-identified clusters within the simulated mass range (greater than about 1e13 solar masses). These are combined with the measured kSZ signal to infer the individual cluster peculiar velocities, providing the opportunity to constrain the behavior of gravity and the dark sector over a range of cosmic scales and epochs. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2511_23417 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Detection of the Pairwise Kinematic Sunyaev-Zel'dovich Effect and Pairwise Velocity with DESI DR1 Galaxies and ACT DR6 and Planck CMB Data Gong, Yulin Gallardo, Patricio A. Bean, Rachel Moore, Jenna Vavagiakis, Eve M. Battaglia, Nicholas Hadzhiyska, Boryana Hsu, Yun-Hsin Aguilar, Jessica Nicole Ahlen, Steven Bianchi, Davide Brooks, David Claybaugh, Todd Canning, Rebecca Devlin, Mark Doel, Peter de la Macorra, Axel Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gutierrez, Gaston Gontcho, Satya Gontcho A Guy, Julien Honscheid, Klaus Howlett, Cullan Liu, R. Henry Ishak, Mustapha Joyce, Dick Kremin, Anthony Lamman, Claire Levi, Michael Landriau, Martin Manera, Marc Meisner, Aaron Miquel, Ramon Niemack, Michael D. Nadathur, Seshadri Percival, Will Prada, Francisco Rossi, Graziano Guachalla, Bernardita Ried Sanchez, Eusebio Seo, Hee-Jong Sprayberry, David Schlegel, David Sifón, Cristóbal Schubnell, Michael Silber, Joseph Harry Tarlé, Gregory Weaver, Benjamin Alan Zhou, Rongpu Zou, Hu Cosmology and Nongalactic Astrophysics We present a 9.3-sigma detection of the pairwise kinematic Sunyaev-Zeldovich (kSZ) effect by combining a sample of 913,286 Luminous Red Galaxies (LRGs) from the Dark Energy Spectroscopic Instrument Data Release 1 (DESI DR1) catalog and co-added Atacama Cosmology Telescope (ACT DR6) and Planck cosmic microwave background (CMB) temperature maps. This represents the highest-significance pairwise kSZ measurement to date. The analysis uses three ACT CMB temperature maps: co-added 150 GHz, total frequency maps, and a component-separated Internal Linear Combination (ILC) map, all of which cover 19,000 square degrees of the sky from Advanced ACTPol observations conducted between 2017 and 2022. Comparison of the results of these three maps serves as a consistency check for potential foreground contamination that may depend on the observation frequency. An estimate of the best-fit mass-averaged optical depth is obtained by comparing the pairwise kSZ curve with the linear-theory prediction of the pairwise velocity under the best-fit Planck cosmology, and is compared with predictions from simulations. This estimate serves as a reference point for future comparisons with thermal SZ-derived optical depth measurements for the same DESI cluster samples, which will be presented in a companion paper. Finally, we employ a machine-learning approach trained on simulations to estimate the optical depth for 456,803 DESI LRG-identified clusters within the simulated mass range (greater than about 1e13 solar masses). These are combined with the measured kSZ signal to infer the individual cluster peculiar velocities, providing the opportunity to constrain the behavior of gravity and the dark sector over a range of cosmic scales and epochs. |
| title | Detection of the Pairwise Kinematic Sunyaev-Zel'dovich Effect and Pairwise Velocity with DESI DR1 Galaxies and ACT DR6 and Planck CMB Data |
| topic | Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2511.23417 |