ChangHoon Hahn
The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation
Hahn, ChangHoon; Wilson, Michael J.; Ruiz-Macias, Omar; Cole, Shaun; Weinberg, David H.; Moustakas, John; Kremin, Anthony; Tinker, Jeremy L.; Smith, Alex; Wechsler, Risa H.; Ahlen, Steven; Alam, Shadab; Bailey, Stephen; Brooks, David; Cooper, Andrew P.; Davis, Tamara M.; Dawson, Kyle; Dey, Arjun; Dey, Biprateep; Eftekharzadeh, Sarah; Eisenstein, Daniel J.; Fanning, Kevin; Forero-Romero, Jaime E.; Frenk, Carlos S.; Gaztañaga, Enrique; A Gontcho, Satya Gontcho; Guy, Julien; Honscheid, Klaus; Ishak, Mustapha; Juneau, Stéphanie; Kehoe, Robert; Kisner, Theodore; Lan, Ting-Wen; Landriau, Martin; Le Guillou, Laurent; Levi, Michael E.; Magneville, Christophe; Martini, Paul; Meisner, Aaron; Myers, Adam D.; Nie, Jundan; Norberg, Peder; Palanque-Delabrouille, Nathalie; Percival, Will J.; Poppett, Claire; Prada, Francisco; Raichoor, Anand; Ross, Ashley J.; Safonova, Sasha; Saulder, Christoph; Schlafly, Eddie; Schlegel, David; Sierra-Porta, David; Tarle, Gregory; Weaver, Benjamin A.; Yèche, Christo...
Authors
Dr Michael Wilson michael.j.wilson@durham.ac.uk
Academic Visitor
Omar Ruiz-Macias
Professor Shaun Cole shaun.cole@durham.ac.uk
Director of the Institute for Computational Cosmology
David H. Weinberg
John Moustakas
Anthony Kremin
Jeremy L. Tinker
Alex Smith
Risa H. Wechsler
Steven Ahlen
Shadab Alam
Stephen Bailey
David Brooks
Andrew P. Cooper
Tamara M. Davis
Kyle Dawson
Arjun Dey
Biprateep Dey
Sarah Eftekharzadeh
Daniel J. Eisenstein
Kevin Fanning
Jaime E. Forero-Romero
Professor Carlos Frenk c.s.frenk@durham.ac.uk
Professor
Enrique Gaztañaga
Satya Gontcho A Gontcho
Julien Guy
Klaus Honscheid
Mustapha Ishak
Stéphanie Juneau
Robert Kehoe
Theodore Kisner
Ting-Wen Lan
Martin Landriau
Laurent Le Guillou
Michael E. Levi
Christophe Magneville
Paul Martini
Aaron Meisner
Adam D. Myers
Jundan Nie
Professor Peder Norberg peder.norberg@durham.ac.uk
Professor
Nathalie Palanque-Delabrouille
Will J. Percival
Claire Poppett
Francisco Prada
Anand Raichoor
Ashley J. Ross
Sasha Safonova
Christoph Saulder
Eddie Schlafly
David Schlegel
David Sierra-Porta
Gregory Tarle
Benjamin A. Weaver
Christophe Yèche
Dr Pauline Zarrouk pauline.s.zarrouk@durham.ac.uk
Academic Visitor
Rongpu Zhou
Zhimin Zhou
Hu Zou
Abstract
Over the next 5 yr, the Dark Energy Spectroscopic Instrument (DESI) will use 10 spectrographs with 5000 fibers on the 4 m Mayall Telescope at Kitt Peak National Observatory to conduct the first Stage IV dark energy galaxy survey. At z < 0.6, the DESI Bright Galaxy Survey (BGS) will produce the most detailed map of the universe during the dark-energy-dominated epoch with redshifts of >10 million galaxies spanning 14,000 deg2. In this work, we present and validate the final BGS target selection and survey design. From the Legacy Surveys, BGS will target an r < 19.5 mag limited sample (BGS Bright), a fainter 19.5 < r < 20.175 color-selected sample (BGS Faint), and a smaller low-z quasar sample. BGS will observe these targets using exposure times scaled to achieve homogeneous completeness and cover the footprint three times. We use observations from the Survey Validation programs conducted prior to the main survey along with simulations to show that BGS can complete its strategy and make optimal use of "bright" time. BGS targets have stellar contamination <1%, and their densities do not depend strongly on imaging properties. BGS Bright will achieve >80% fiber assignment efficiency. Finally, BGS Bright and BGS Faint will achieve >95% redshift success over any observing condition. BGS meets the requirements for an extensive range of scientific applications. BGS will yield the most precise baryon acoustic oscillation and redshift-space distortion measurements at z < 0.4. It presents opportunities for new methods that require highly complete and dense samples (e.g., N-point statistics, multitracers). BGS further provides a powerful tool to study galaxy populations and the relations between galaxies and dark matter.
Citation
Hahn, C., Wilson, M. J., Ruiz-Macias, O., Cole, S., Weinberg, D. H., Moustakas, J., …Zou, H. (2023). The DESI Bright Galaxy Survey: Final Target Selection, Design, and Validation. Astronomical Journal, 165(6), Article 253. https://doi.org/10.3847/1538-3881/accff8
Journal Article Type | Article |
---|---|
Acceptance Date | Mar 3, 2023 |
Online Publication Date | May 26, 2023 |
Publication Date | Jun 1, 2023 |
Deposit Date | Nov 1, 2023 |
Publicly Available Date | Nov 1, 2023 |
Journal | The Astronomical Journal |
Print ISSN | 0004-6256 |
Electronic ISSN | 1538-3881 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 165 |
Issue | 6 |
Article Number | 253 |
DOI | https://doi.org/10.3847/1538-3881/accff8 |
Keywords | Space and Planetary Science; Astronomy and Astrophysics |
Public URL | https://durham-repository.worktribe.com/output/1873398 |
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Copyright Statement
© 2023. The Author(s). Published by the American Astronomical Society.
Original content from this work may be used under the terms of the Creative Commons Attribution 4.0 licence. Any further distribution of this work must maintain attribution to the author(s) and the title of the work, journal citation and DOI.
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