Document detail
ID
oai:arXiv.org:2408.13842
Topic
Astrophysics - Cosmology and Nonga... Astrophysics - Astrophysics of Gal...Author
Said, Khaled Howlett, Cullan Davis, Tamara Lucey, John Saulder, Christoph Douglass, Kelly Kim, Alex G. Kremin, Anthony Ross, Caitlin Aldering, Greg Aguilar, Jessica Nicole Ahlen, Steven BenZvi, Segev Bianchi, Davide Brooks, David Claybaugh, Todd Dawson, Kyle de la Macorra, Axel Dey, Biprateep Doel, Peter Fanning, Kevin Ferraro, Simone Font-Ribera, Andreu Forero-Romero, Jaime E. Gaztañaga, Enrique Gontcho, Satya Gontcho A Guy, Julien Honscheid, Klaus Kehoe, Robert Kisner, Theodore Lambert, Andrew Landriau, Martin Guillou, Laurent Le Manera, Marc Meisner, Aaron Miquel, Ramon Moustakas, John Muñoz-Gutiérrez, Andrea Myers, Adam Nie, Jundan Palanque-Delabrouille, Nathalie Percival, Will Prada, Francisco Rossi, Graziano Sanchez, Eusebio Schlegel, David Schubnell, Michael Silber, Joseph Harry Sprayberry, David Tarlé, Gregory Magana, Mariana Vargas Weaver, Benjamin Alan Wechsler, Risa Zhou, Zhimin Zou, HuCategory
sciences: astrophysics
Year
2024
listing date
8/28/2024
Keywords
velocities spectroscopic dispersion survey galaxies peculiar velocity desi astrophysicsAbstract
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 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\% of observed galaxies (4267) have relative velocity dispersion errors below 10\%.
This percentage increases to 75\% 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 FP) $\pm 4.86$(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.
;Comment: 18 pages, 9 figures, 2 tables.
Submitted for publication in MNRAS
Said, Khaled,Howlett, Cullan,Davis, Tamara,Lucey, John,Saulder, Christoph,Douglass, Kelly,Kim, Alex G.,Kremin, Anthony,Ross, Caitlin,Aldering, Greg,Aguilar, Jessica Nicole,Ahlen, Steven,BenZvi, Segev,Bianchi, Davide,Brooks, David,Claybaugh, Todd,Dawson, Kyle,de la Macorra, Axel,Dey, Biprateep,Doel, Peter,Fanning, Kevin,Ferraro, Simone,Font-Ribera, Andreu,Forero-Romero, Jaime E.,Gaztañaga, Enrique,Gontcho, Satya Gontcho A,Guy, Julien,Honscheid, Klaus,Kehoe, Robert,Kisner, Theodore,Lambert, Andrew,Landriau, Martin,Guillou, Laurent Le,Manera, Marc,Meisner, Aaron,Miquel, Ramon,Moustakas, John,Muñoz-Gutiérrez, Andrea,Myers, Adam,Nie, Jundan,Palanque-Delabrouille, Nathalie,Percival, Will,Prada, Francisco,Rossi, Graziano,Sanchez, Eusebio,Schlegel, David,Schubnell, Michael,Silber, Joseph Harry,Sprayberry, David,Tarlé, Gregory,Magana, Mariana Vargas,Weaver, Benjamin Alan,Wechsler, Risa,Zhou, Zhimin,Zou, Hu, 2024, DESI Peculiar Velocity Survey -- Fundamental Plane
