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Probing cosmic velocities with the pairwise kinematic Sunyaev-Zel'dovich signal in DESI Bright Galaxy Sample DR1 and ACT DR6

Fuente: arXiv

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Autori principali:	Hadzhiyska, B., Gong, Y., Hsu, Y., Gallardo, P. A., Aguilar, J., Ahlen, S., Alonso, D., Bean, R., Bianchi, D., Brooks, D., Castander, F. J., Claybaugh, T., Cole, S., Cuceu, A., de la Macorra, A., Dey, Arjun, Ferraro, S., Font-Ribera, A., Forero-Romero, J. E., Gontcho, S. Gontcho A, Gutierrez, G., Guy, J., Herrera-Alcantar, H. K., Howlett, C., Huterer, D., Ishak, M., Joyce, R., Kisner, T., Kremin, A., Landriau, M., Guillou, L. Le, Levi, M. E., Manera, M., Meisner, A., Miquel, R., Moodley, K., Mroczkowski, T., Nadathur, S., Palanque-Delabrouille, N., Percival, W. J., Prada, F., Qu, F. J., Perez-Rafols, I., Guachalla, B. Ried, Rossi, G., Sanchez, E., Schaan, E., Schlegel, D., Schubnell, M., Seo, H., Sifon, C., Silber, J., Sprayberry, D., Tarle, G., Vavagiakis, E. M., Weaver, B. A., Zhou, R., Zou, H.
Natura:	Preprint
Pubblicazione:	2025
Soggetti:	Cosmology and Nongalactic Astrophysics
Accesso online:	Acceder al recurso
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author	Hadzhiyska, B. Gong, Y. Hsu, Y. Gallardo, P. A. Aguilar, J. Ahlen, S. Alonso, D. Bean, R. Bianchi, D. Brooks, D. Castander, F. J. Claybaugh, T. Cole, S. Cuceu, A. de la Macorra, A. Dey, Arjun Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Herrera-Alcantar, H. K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Kisner, T. Kremin, A. Landriau, M. Guillou, L. Le Levi, M. E. Manera, M. Meisner, A. Miquel, R. Moodley, K. Mroczkowski, T. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Qu, F. J. Perez-Rafols, I. Guachalla, B. Ried Rossi, G. Sanchez, E. Schaan, E. Schlegel, D. Schubnell, M. Seo, H. Sifon, C. Silber, J. Sprayberry, D. Tarle, G. Vavagiakis, E. M. Weaver, B. A. Zhou, R. Zou, H.
author_facet	Hadzhiyska, B. Gong, Y. Hsu, Y. Gallardo, P. A. Aguilar, J. Ahlen, S. Alonso, D. Bean, R. Bianchi, D. Brooks, D. Castander, F. J. Claybaugh, T. Cole, S. Cuceu, A. de la Macorra, A. Dey, Arjun Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Herrera-Alcantar, H. K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Kisner, T. Kremin, A. Landriau, M. Guillou, L. Le Levi, M. E. Manera, M. Meisner, A. Miquel, R. Moodley, K. Mroczkowski, T. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Qu, F. J. Perez-Rafols, I. Guachalla, B. Ried Rossi, G. Sanchez, E. Schaan, E. Schlegel, D. Schubnell, M. Seo, H. Sifon, C. Silber, J. Sprayberry, D. Tarle, G. Vavagiakis, E. M. Weaver, B. A. Zhou, R. Zou, H.
contents	We present a measurement of the pairwise kinematic Sunyaev-Zel'dovich (kSZ) signal using the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Sample (BGS) Data Release 1 (DR1) galaxy sample overlapping with the Atacama Cosmology Telescope (ACT) CMB temperature map. Our analysis makes use of $1.6$ million galaxies with stellar masses $\log M_\star/M_\odot > 10$, and we explore measurements across a range of aperture sizes ($2.1' < θ_{\rm ap} < 3.5'$) and stellar mass selections. This statistic directly probes the velocity field of the large-scale structure, a unique observable of cosmic dynamics and modified gravity. In particular, at low redshifts, this quantity is especially interesting, as deviations from General Relativity are expected to be largest. Notably, our result represents the highest-significance low-redshift ($z \sim 0.3$) detection of the kSZ pairwise effect yet. In our most optimal configuration ($θ_{\rm ap} = 3.3'$, $\log M_\star > 11$), we achieve a $5σ$ detection. Assuming that an estimate of the optical depth and galaxy bias of the sample exists via e.g., external observables, this measurement constrains the fundamental cosmological combination $H_0 f σ_8^2$. A key challenge is the degeneracy with the galaxy optical depth. We address this by combining CMB lensing, which allows us to infer the halo mass and galaxy population properties, with hydrodynamical simulation estimates of the mean optical depth, $\bar τ$. We stress that this is a proof-of-concept analysis; with BGS DR2 data we expect to improve the statistical precision by roughly a factor of two, paving the way toward robust tests of modified gravity with kSZ-informed velocity-field measurements at low redshift.
format	Preprint
id	arxiv_https___arxiv_org_abs_2510_14135
institution	arXiv
publishDate	2025
record_format	arxiv
spellingShingle	Probing cosmic velocities with the pairwise kinematic Sunyaev-Zel'dovich signal in DESI Bright Galaxy Sample DR1 and ACT DR6 Hadzhiyska, B. Gong, Y. Hsu, Y. Gallardo, P. A. Aguilar, J. Ahlen, S. Alonso, D. Bean, R. Bianchi, D. Brooks, D. Castander, F. J. Claybaugh, T. Cole, S. Cuceu, A. de la Macorra, A. Dey, Arjun Ferraro, S. Font-Ribera, A. Forero-Romero, J. E. Gontcho, S. Gontcho A Gutierrez, G. Guy, J. Herrera-Alcantar, H. K. Howlett, C. Huterer, D. Ishak, M. Joyce, R. Kisner, T. Kremin, A. Landriau, M. Guillou, L. Le Levi, M. E. Manera, M. Meisner, A. Miquel, R. Moodley, K. Mroczkowski, T. Nadathur, S. Palanque-Delabrouille, N. Percival, W. J. Prada, F. Qu, F. J. Perez-Rafols, I. Guachalla, B. Ried Rossi, G. Sanchez, E. Schaan, E. Schlegel, D. Schubnell, M. Seo, H. Sifon, C. Silber, J. Sprayberry, D. Tarle, G. Vavagiakis, E. M. Weaver, B. A. Zhou, R. Zou, H. Cosmology and Nongalactic Astrophysics We present a measurement of the pairwise kinematic Sunyaev-Zel'dovich (kSZ) signal using the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Sample (BGS) Data Release 1 (DR1) galaxy sample overlapping with the Atacama Cosmology Telescope (ACT) CMB temperature map. Our analysis makes use of $1.6$ million galaxies with stellar masses $\log M_\star/M_\odot > 10$, and we explore measurements across a range of aperture sizes ($2.1' < θ_{\rm ap} < 3.5'$) and stellar mass selections. This statistic directly probes the velocity field of the large-scale structure, a unique observable of cosmic dynamics and modified gravity. In particular, at low redshifts, this quantity is especially interesting, as deviations from General Relativity are expected to be largest. Notably, our result represents the highest-significance low-redshift ($z \sim 0.3$) detection of the kSZ pairwise effect yet. In our most optimal configuration ($θ_{\rm ap} = 3.3'$, $\log M_\star > 11$), we achieve a $5σ$ detection. Assuming that an estimate of the optical depth and galaxy bias of the sample exists via e.g., external observables, this measurement constrains the fundamental cosmological combination $H_0 f σ_8^2$. A key challenge is the degeneracy with the galaxy optical depth. We address this by combining CMB lensing, which allows us to infer the halo mass and galaxy population properties, with hydrodynamical simulation estimates of the mean optical depth, $\bar τ$. We stress that this is a proof-of-concept analysis; with BGS DR2 data we expect to improve the statistical precision by roughly a factor of two, paving the way toward robust tests of modified gravity with kSZ-informed velocity-field measurements at low redshift.
title	Probing cosmic velocities with the pairwise kinematic Sunyaev-Zel'dovich signal in DESI Bright Galaxy Sample DR1 and ACT DR6
topic	Cosmology and Nongalactic Astrophysics
url	https://arxiv.org/abs/2510.14135