Clustering of DESI galaxies split by thermal Sunyaev-Zeldovich effect

The thermal Sunyaev-Zeldovich (tSZ) effect is associated with galaxy clusters - extremely large and dense structures tracing the dark matter with a higher bias than isolated galaxies. We propose to use the tSZ data to separate galaxies from redshift surveys into distinct subpopulations corresponding...

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Detalles Bibliográficos
Autores: Rashkovetskyi, Michael, Eisenstein, Daniel, Aguilar, Jessica Nicole, Ahlen, Steven, Anand, Abhijeet|||0000-0003-2923-1585, Bianchi, Davide, Brooks, David, Castander Serentil, Francisco Javier|||0000-0001-7316-4573, Claybaugh, Todd, Cuceu, Andrei|||0000-0002-2169-0595, Dawson, Kyle S.|||0000-0002-0553-3805, de la Macorra, Axel, Dey, Arjun|||0000-0002-4928-4003, Doel, Peter, Ferraro, Simone, Font Ribera, Andreu, Forero Romero, Jaime E., Gaztañaga, Enrique|||0000-0001-9632-0815, Gutierrez, Gaston, Herrera Alcantar, Hiram K.|||0000-0002-9136-9609, Honscheid, Klaus|||0000-0002-6550-2023, Howlett, Cullan, Ishak, Mustapha|||0000-0002-6024-466X, Joyce, Richard|||0000-0003-0201-5241, Kehoe, Robert, Kisner, Theodore|||0000-0003-3510-7134, Kremin, Anthony|||0000-0001-6356-7424, Lahav, Ofer, Pérez Ràfols, Ignasi|||0000-0001-6979-0125
Tipo de recurso: artículo
Fecha de publicación:2025
País:España
Institución:Universitat Politècnica de Catalunya (UPC)
Repositorio:UPCommons. Portal del coneixement obert de la UPC
Idioma:inglés
OAI Identifier:oai:upcommons.upc.edu:2117/449682
Acceso en línea:https://hdl.handle.net/2117/449682
https://dx.doi.org/10.33232/001c.146033
Access Level:acceso abierto
Palabra clave:astro-ph.CO (Physics - Cosmology and Extragalactic Astrophysics)
Cosmology
Large-scale structure of the Universe
Redshift surveys
Cosmic microwave background radiation
Sunyaev-Zeldovich effect
Galaxy clusters
Galaxy dark matter halos
Astronomy data analysis
Atacama Cosmology Telescope
Àrees temàtiques de la UPC::Física::Astronomia i astrofísica
Descripción
Sumario:The thermal Sunyaev-Zeldovich (tSZ) effect is associated with galaxy clusters - extremely large and dense structures tracing the dark matter with a higher bias than isolated galaxies. We propose to use the tSZ data to separate galaxies from redshift surveys into distinct subpopulations corresponding to different densities and biases independently of the redshift survey systematics. Leveraging the information from different environments, as in density-split and density-marked clustering, is known to tighten the constraints on cosmological parameters, like Om, s8 and neutrino mass. We use data from the Dark Energy Spectroscopic Instrument (DESI) and the Atacama Cosmology Telescope (ACT) in their region of overlap to demonstrate informative tSZ splitting of Luminous Red Galaxies (LRGs). We discover a significant increase in the large-scale clustering of DESI LRGs corresponding to detections starting from 1-2 sigma in the ACT DR6 + Planck tSZ Compton-y map, below the cluster candidate threshold (4 sigma). We also find that such galaxies have higher line-of-sight coordinate (and velocity) dispersions and a higher number of close neighbors than both the full sample and near-zero tSZ regions. We produce simple simulations of tSZ maps that are intrinsically consistent with galaxy catalogs and do not include systematic effects, and find a similar pattern of large-scale clustering enhancement with tSZ effect significance. Moreover, we observe that this relative bias pattern remains largely unchanged with variations in the galaxy-halo connection model in our simulations. This is promising for future cosmological inference from tSZ-split clustering with semi-analytical models. Thus, we demonstrate that valuable cosmological information is present in the lower signal-to-noise regions of the thermal Sunyaev-Zeldovich map, extending far beyond the individual cluster candidates.

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