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Lookup NU author(s): Dr Vicky FawcettORCiD
This work is licensed under a Creative Commons Attribution 4.0 International License (CC BY 4.0).
© 2023. The Author(s). Published by the American Astronomical Society.Millions of quasar spectra will be collected by the Dark Energy Spectroscopic Instrument (DESI), leading to a fourfold increase in the number of known quasars. High-accuracy quasar classification is essential to tighten constraints on cosmological parameters measured at the highest redshifts DESI observes (z > 2.0). We present spectral templates for identification and redshift estimation of quasars in the DESI Year 1 data release. The quasar templates are comprised of two quasar eigenspectra sets, trained on spectra from the Sloan Digital Sky Survey. The sets are specialized to reconstruct quasar spectral variation observed over separate yet overlapping redshift ranges and, together, are capable of identifying DESI quasars from 0.05 < z < 7.0. The new quasar templates show significant improvement over the previous DESI quasar templates regarding catastrophic failure rates, redshift precision and accuracy, quasar completeness, and the contamination fraction in the final quasar sample.
Author(s): Brodzeller A, Dawson K, Bailey S, Yu J, Ross AJ, Bault A, Filbert S, Aguilar J, Ahlen S, Alexander DM, Armengaud E, Berti A, Brooks D, Chaussidon E, de la Macorra A, Doel P, Fanning K, Fawcett VA, Font-Ribera A, Gontcho A Gontcho S, Guy J, Honscheid K, Juneau S, Kehoe R, Kisner T, Kremin A, Lan T-W, Landriau M, Levi ME, Magneville C, Martini P, Meisner AM, Miquel R, Moustakas J, Palanque-Delabrouille N, Percival WJ, Prada F, Ravoux C, Rossi G, Saulder C, Siudek M, Tarle G, Weaver BA, Youles S, Zheng Z, Zhou R, Zhou Z
Publication type: Article
Publication status: Published
Journal: Astronomical Journal
Year: 2023
Volume: 166
Issue: 2
Print publication date: 01/08/2023
Online publication date: 18/07/2023
Acceptance date: 01/07/2023
Date deposited: 10/08/2023
ISSN (print): 0004-6256
ISSN (electronic): 1538-3881
Publisher: American Astronomical Society
URL: https://doi.org/10.3847/1538-3881/ace35d
DOI: 10.3847/1538-3881/ace35d
Data Access Statement: All data shown in figures are available at doi:10.5281/zenodo.7872747
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