The DESI Peculiar Velocity Survey

ORAL

Abstract

The Dark Energy Spectroscopic Instrument (DESI) Peculiar Velocity Survey is a secondary targeting program of the DESI main survey designed to systematically measure peculiar motion at z < 0.2. The Peculiar Velocity (PV) Survey combines the spectroscopic galaxy redshifts recorded by DESI with standardizable distance measurements from elliptical and spiral galaxies in the DESI Bright Galaxy Survey (BGS). Over the next few years, the DESI PV Survey will produce the largest catalog of peculiar velocities ever assembled, comprising more than 400,000 Fundamental Plane distances of elliptical galaxies in the BGS and more than 125,000 Tully-Fisher distances of disc galaxies in the Siena Galaxy Atlas. These measurements will offer a unique perspective on the mass and motions in the low redshift Universe and allow precision tests of gravity and dark energy. We describe the target selection of the PV survey and present preliminary results recorded during the first year of DESI observations.

*This research is supported by the Director, Office of Science, Office of High Energy Physics of the U.S. Department of Energy under Contract No. DE–AC02–05CH11231, and by the National Energy Research Scientific Computing Center, a DOE Office of Science User Facility under the same contract; additional support for DESI is provided by the U.S. National Science Foundation, Division of Astronomical Sciences under Contract No. AST-0950945 to the NSF’s National Optical-Infrared Astronomy Research Laboratory; the Science and Technologies Facilities Council of the United Kingdom; the Gordon and Betty Moore Foundation; the Heising-Simons Foundation; the French Alternative Energies and Atomic Energy Commission (CEA); the National Council of Science and Technology of Mexico (CONACYT); the Ministry of Science and Innovation of Spain (MICINN), and by the DESI Member Institutions: https://www.desi.lbl.gov/collaborating-institutionsThe authors are honored to be permitted to conduct scientific research on Iolkam Du’ag (Kitt Peak), a mountain with particular significance to the Tohono O’odham Nation.For more information, visit desi.lbl.gov.

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Presenters

  • Kelly Douglass

    • University of Rochester

Authors

  • Kelly Douglass

    • University of Rochester