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Baryon acoustic oscillations in the projected cross-correlation function between the eBOSS DR16 quasars and photometric galaxies from the DESI Legacy Imaging Surveys

Zarrouk, Pauline; Rezaie, Mehdi; Raichoor, Anand; Ross, Ashley J; Alam, Shadab; Blum, Robert; Brookes, David; Chuang, Chia-Hsun; Cole, Shaun; Dawson, Kyle S; Eisenstein, Daniel J; Kehoe, Robert; Landriau, Martin; Moustakas, John; Myers, Adam D; Norberg, Peder; Percival, Will J; Prada, Francisco; Schubnell, Michael; Seo, Hee-Jong; Tarlé, Gregory; Zhao, Cheng

Baryon acoustic oscillations in the projected cross-correlation function between the eBOSS DR16 quasars and photometric galaxies from the DESI Legacy Imaging Surveys Thumbnail


Authors

Mehdi Rezaie

Anand Raichoor

Ashley J Ross

Shadab Alam

Robert Blum

David Brookes

Chia-Hsun Chuang

Kyle S Dawson

Daniel J Eisenstein

Robert Kehoe

Martin Landriau

John Moustakas

Adam D Myers

Will J Percival

Francisco Prada

Michael Schubnell

Hee-Jong Seo

Gregory Tarlé

Cheng Zhao



Abstract

We search for the baryon acoustic oscillations in the projected cross-correlation function binned into transverse comoving radius between the SDSS-IV DR16 eBOSS quasars and a dense photometric sample of galaxies selected from the DESI Legacy Imaging Surveys. We estimate the density of the photometric sample of galaxies in this redshift range to be about 2900 deg−2, which is deeper than the official DESI emission line galaxy selection, and the density of the spectroscopic sample is about 20 deg−2. In order to mitigate the systematics related to the use of different imaging surveys close to the detection limit, we use a neural network approach that accounts for complex dependences between the imaging attributes and the observed galaxy density. We find that we are limited by the depth of the imaging surveys that affects the density and purity of the photometric sample and its overlap in redshift with the quasar sample, which thus affects the performance of the method. When cross-correlating the photometric galaxies with quasars in the range 0.6 ≤ z ≤ 1.2, the cross-correlation function can provide better constraints on the comoving angular distance DM (6 per cent precision) compared to the constraint on the spherically averaged distance DV (9 per cent precision) obtained from the autocorrelation. Although not yet competitive, this technique will benefit from the arrival of deeper photometric data from upcoming surveys that will enable it to go beyond the current limitations we have identified in this work.

Citation

Zarrouk, P., Rezaie, M., Raichoor, A., Ross, A. J., Alam, S., Blum, R., …Zhao, C. (2021). Baryon acoustic oscillations in the projected cross-correlation function between the eBOSS DR16 quasars and photometric galaxies from the DESI Legacy Imaging Surveys. Monthly Notices of the Royal Astronomical Society, 503(2), 2562-2582. https://doi.org/10.1093/mnras/stab298

Journal Article Type Article
Acceptance Date Jan 21, 2021
Online Publication Date Feb 9, 2021
Publication Date 2021-05
Deposit Date Apr 21, 2021
Publicly Available Date Apr 21, 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 503
Issue 2
Pages 2562-2582
DOI https://doi.org/10.1093/mnras/stab298

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Copyright Statement
This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©: 2021 the authors. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.







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