DESI peculiar velocity survey – Fundamental Plane

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.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2025-05-02
DOI
https://doi.org/10.1093/mnras/staf700
Citations
12
Primary Topic
Inertial Sensor and Navigation
Type
article
Field-Weighted Citation Impact
59.92
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article

DESI peculiar velocity survey – Fundamental Plane

Kelly A. Douglass, A. Muñoz-Gutiérrez, Michael S. Schubnell, N. Palanque‐Delabrouille et al.
12 citations
Monthly Notices of the Royal Astronomical Society
Inertial Sensor and Navigation
59.92
article

DESI peculiar velocity survey – Fundamental Plane

Kelly A. Douglass, A. Muñoz-Gutiérrez, Michael S. Schubnell, N. Palanque‐Delabrouille, Gregory Tarlé, Kyle Dawson, Andreu Font-Ribera, Laurent Le Guillou, David Sprayberry, D. Bianchi, David J. Schlegel, Axel de la Macorra, Martin Landriau, Simone Ferraro, Jundan Nie, David J. Brooks, J. Aguilar, J. Guy, Eusebio Sanchez, Satya Gontcho A Gontcho, S. BenZvi, Christoph Saulder, ENRIQUE GAZTAÑAGA, J. Silber, Cullan Howlett, K. Fanning, J. E. Forero-Romero, T. M. Davis, Steven P. Ahlen, Aaron Meisner, R. Miquel, Theodore S. Kisner, Biprateep Dey, Andrew Lambert, J. R. Lucey, R. Kehoe, Risa H. Wechsler, John Moustakas, Zhimin Zhou, M. Vargas-Magaña, Alex Kim, Greg Aldering, Hu Zou, Will Percival, Marc Manera, Benjamin A. Weaver, Caitlin Ross, Graziano Rossi, Klaus Honscheid, Peter Doel, Khaled Saïd, T. Claybaugh, Adam D. Myers, Francisco Prada
article en
12 citations

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.

Monthly Notices of the Royal Astronomical SocietyVol. 539(4)
Boston University (US), Institució Catalana de Recerca i Estudis Avançats (ES), Universidad Complutense de Madrid (ES), Universitat Autònoma de Barcelona (ES), University of Wyoming (US), Centre National de la Recherche Scientifique (FR), Institute of Space Sciences (ES), Lawrence Berkeley National Laboratory (US), University of Waterloo (CA), Universidad de Los Andes (CO), The University of Queensland (AU), Universidad Autónoma de la Ciudad de México (MX), University of Pittsburgh (US), Southern Methodist University (US), Perimeter Institute (CA), Institute for High Energy Physics (ES), University of Milan (IT), Durham University (GB), Chinese Academy of Sciences (CN), University of Utah (US), Commissariat à l'Énergie Atomique et aux Énergies Alternatives (FR), Université Paris-Saclay (FR), University of Michigan (US), SLAC National Accelerator Laboratory (US), Sejong University (KR), Sorbonne Université (FR), Max Planck Institute for Extraterrestrial Physics (DE), Institut d'Estudis Espacials de Catalunya (ES), Kavli Institute for Particle Astrophysics and Cosmology (US), Laboratoire de Physique Nucléaire et de Hautes Énergies (FR), CEA Paris-Saclay (FR), Community Science and Data Center (US), NSF NOIRLab (US), Universidad de Los Andes (BO), Instituto de Astrofísica de Andalucía (ES), National Astronomical Observatories (CN), Institut de Recherche sur les Lois Fondamentales de l'Univers (FR), Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES), Institute of Science and Technology, University College London (GB), The Ohio State University (US), University of Rochester (US), University of Portsmouth (GB), Universidad Nacional Autónoma de México (MX), Siena College (US), University of California, Berkeley (US), Stanford University (US)
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Inertial Sensor and Navigation
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