DESI peculiar velocity survey – Fundamental Plane
Year: 2025
Type: article
Abstract: ABSTRACT The Dark Energy Spectroscopic Instrument (DESI) peculiar velocity survey aims to measure the peculiar velocities of early- and late-type galaxies within the DESI footprint using both the Fundamental Plane and optical Tully–Fisher relations. Direct measurements of peculiar velocities can significantly improve constraints on the growth rate of structure, reducing uncertainty by a factor of approximately 2.5 at redshift 0.1 compared to the DESI Bright Galaxy Survey’s redshift space distortion measurements alone. We assess the quality of stellar velocity dispersion measurements from DESI spectroscopic data. These measurements, along with photometric data from the Legacy Survey, establish the Fundamental Plane relation and determine distances and peculiar velocities of early-type galaxies. During survey validation, we obtain spectra for 6698 unique early-type galaxies, up to a photometric redshift of 0.15. 64 per cent of observed galaxies (4267) have relative velocity dispersion errors below 10 per cent. This percentage increases to 75 per cent if we restrict our sample to galaxies with spectroscopic redshifts below 0.1. We use the measured central velocity dispersion, along with photometry from the DESI Legacy Imaging Surveys, to fit the Fundamental Plane parameters using a 3D Gaussian maximum likelihood algorithm that accounts for measurement uncertainties and selection cuts. In addition, we conduct zero-point calibration using the absolute distance measurements to the Coma cluster, leading to a value of the Hubble constant, $H_0 = 76.05 \pm 0.35$ (statistical) $\pm 0.49$ (systematic Fundamental Plane) $\pm 4.86$ (statistical due to calibration) $\mathrm{km \ s^{-1} Mpc^{-1}}$. This $H_0$ value is within $2\sigma$ of Planck cosmic microwave background results and within $1\sigma$ of other low-redshift distance indicator-based measurements.
Authors: Khaled Said, Cullan Howlett, Tamara Davis, John Lucey, Christoph Saulder, Kelly Douglass, Alex G Kim, Anthony Kremin, Caitlin Ross, Greg Aldering, Jessica Nicole Aguilar, Steven Ahlen, Segev BenZvi, Davide Bianchi, David Brooks, Todd Claybaugh, Kyle Dawson, Axel de la Macorra, Biprateep Dey, Peter Doel, Kevin Fanning, Simone Ferraro, Andreu Font-Ribera, Jaime E Forero-Romero, Enrique Gaztañaga, Satya Gontcho A Gontcho, Julien Guy, Klaus Honscheid, Robert Kehoe, Theodore Kisner, Andrew Lambert, Martin Landriau, Laurent Le Guillou, Marc Manera, Aaron Meisner, Ramon Miquel, John Moustakas, Andrea Muñoz-Gutiérrez, Adam Myers, Jundan Nie, Nathalie Palanque-Delabrouille, Will Percival, Francisco Prada, Graziano Rossi, Eusebio Sanchez, David Schlegel, Michael Schubnell, Joseph Harry Silber, David Sprayberry, Gregory Tarlé, Mariana Vargas Magana, Benjamin Alan Weaver, Risa Wechsler, Zhimin Zhou, Hu Zou
Institutions: The University of Queensland, Durham University, Max Planck Institute for Extraterrestrial Physics, University of Rochester, Lawrence Berkeley National Laboratory, Boston University, University of Milan, University College London, University of Utah, Universidad Nacional Autónoma de México, University of Pittsburgh, SLAC National Accelerator Laboratory, Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, University of California, Berkeley, Institute for High Energy Physics, Barcelona Institute of Science and Technology, Universidad de Los Andes, Institute of Space Sciences, Institut d'Estudis Espacials de Catalunya, University of Portsmouth, The Ohio State University, Southern Methodist University, Centre National de la Recherche Scientifique, Sorbonne Université, Laboratoire de Physique Nucléaire et de Hautes Énergies, Institut National de Physique Nucléaire et de Physique des Particules, Universitat Autònoma de Barcelona, NSF NOIRLab, Institució Catalana de Recerca i Estudis Avançats, Siena College, University of Wyoming, Chinese Academy of Sciences, National Astronomical Observatories, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Université Paris-Saclay, CEA Paris-Saclay - Etablissement de Saclay, CEA Paris-Saclay, Institut de Recherche sur les Lois Fondamentales de l'Univers, University of Waterloo, Perimeter Institute, Instituto de Astrofísica de Andalucía, Sejong University, Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas, University of Michigan
Language: English
Subfield: Astronomy and Astrophysics
Field: Physics and Astronomy
Domain: Physical Sciences
Open Access status: gold
Estimated APC paid: $3,046
Funders: National Science Foundation, U.S. Department of Energy, National Aeronautics and Space Administration, Gordon and Betty Moore Foundation, California Institute of Technology, California Earthquake Authority, Australian Government, National Energy Research Scientific Computing Center, Chinese Academy of Sciences, Consejo Nacional de Ciencia y Tecnología, Ministerio de Ciencia e Innovación, Commissariat à l'Énergie Atomique et aux Énergies Alternatives, Office of Science, Jet Propulsion Laboratory, Science and Technology Facilities Council, Australian Research Council, Division of Astronomical Sciences, High Energy Physics, Lawrence Berkeley National Laboratory
Awards: G1044631029, G1079818582, G1143651532, G1286236842, G1632040200, G1813527838, G1863003419, PROPOSAL TO EXPLORE THE FUNDAMENTAL CONSTITUENTS OF THE UNIVERSE FUNDING YEARS FY 2018-2020, G229706147, G3083819904, MODELING SPECTRA OF 160,000 BOSS QUASARS FOR LYMAN ALPHA STUDIES, G419881185, G42916606, G4501827968, G498139845, G520148302, THEORETICAL AND EXPERIMENTAL STUDIES OF ELEMENTARY PARTICLES AND FIELDS, ARC Centre of Excellence for Gravitational Wave Discovery, G6652958823, G6876926712, Management and Operations of the National Optical Astronomy Observatory, G7354628648, G759921648, G969889393
OpenAlex ID: W4414577784