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Characterizing the target selection pipeline for the Dark Energy Spectroscopic Instrument Bright Galaxy Survey

Ruiz-Macias, Omar; Zarrouk, Pauline; Cole, Shaun; Baugh, Carlton M; Norberg, Peder; Lucey, John; Dey, Arjun; Eisenstein, Daniel J; Doel, Peter; Gaztañaga, Enrique; Hahn, ChangHoon; Kehoe, Robert; Kitanidis, Ellie; Landriau, Martin; Lang, Dustin; Moustakas, John; Myers, Adam D; Prada, Francisco; Schubnell, Michael; Weinberg, David H; Wilson, MJ

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Authors

Omar Ruiz-Macias

Arjun Dey

Daniel J Eisenstein

Peter Doel

Enrique Gaztañaga

ChangHoon Hahn

Robert Kehoe

Ellie Kitanidis

Martin Landriau

Dustin Lang

John Moustakas

Adam D Myers

Francisco Prada

Michael Schubnell

David H Weinberg

MJ Wilson



Abstract

We present the steps taken to produce a reliable and complete input galaxy catalogue for the Dark Energy Spectroscopic Instrument (DESI) Bright Galaxy Survey (BGS) using the photometric Legacy Survey DR8 DECam. We analyse some of the main issues faced in the selection of targets for the DESI BGS, such as star–galaxy separation, contamination by fragmented stars and bright galaxies. Our pipeline utilizes a new way to select BGS galaxies using Gaia photometry and we implement geometrical and photometric masks that reduce the number of spurious objects. The resulting catalogue is cross-matched with the Galaxy And Mass Assembly (GAMA) survey to assess the completeness of the galaxy catalogue and the performance of the target selection. We also validate the clustering of the sources in our BGS catalogue by comparing with mock catalogues and the Sloan Digital Sky Survey (SDSS) data. Finally, the robustness of the BGS selection criteria is assessed by quantifying the dependence of the target galaxy density on imaging and other properties. The largest systematic correlation we find is a 7 per cent suppression of the target density in regions of high stellar density.

Citation

Ruiz-Macias, O., Zarrouk, P., Cole, S., Baugh, C. M., Norberg, P., Lucey, J., …Wilson, M. (2021). Characterizing the target selection pipeline for the Dark Energy Spectroscopic Instrument Bright Galaxy Survey. Monthly Notices of the Royal Astronomical Society, 502(3), 4328-4349. https://doi.org/10.1093/mnras/stab292

Journal Article Type Article
Acceptance Date Jan 26, 2021
Online Publication Date Feb 3, 2021
Publication Date 2021-04
Deposit Date Apr 8, 2021
Publicly Available Date Apr 8, 2021
Journal Monthly Notices of the Royal Astronomical Society
Print ISSN 0035-8711
Electronic ISSN 1365-2966
Publisher Royal Astronomical Society
Peer Reviewed Peer Reviewed
Volume 502
Issue 3
Pages 4328-4349
DOI https://doi.org/10.1093/mnras/stab292
Public URL https://durham-repository.worktribe.com/output/1250055

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Copyright Statement
2021 The Author(s).
Published by Oxford University Press on behalf of Royal Astronomical Society. This is an Open Access article distributed under the terms of the Creative
Commons Attribution License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted reuse, distribution, and reproduction in any medium,
provided the original work is properly cited.






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