Professor David Alexander d.m.alexander@durham.ac.uk
Professor
The DESI Survey Validation: Results from Visual Inspection of the Quasar Survey Spectra
Alexander, David M.; Davis, Tamara M.; Chaussidon, E.; Fawcett, V.A.; X. Gonzalez-Morales, Alma; Lan, Ting-Wen; Yèche, Christophe; Ahlen, S.; Aguilar, J.N.; Armengaud, E.; Bailey, S.; Brooks, D.; Cai, Z.; Canning, R.; Carr, A.; Chabanier, S.; Cousinou, Marie-Claude; Dawson, K.; de la Macorra, A.; Dey, A.; Dey, Biprateep; Dhungana, G.; Edge, A.C.; Eftekharzadeh, S.; Fanning, K.; Farr, James; Font-Ribera, A.; Garcia-Bellido, J.; Garrison, Lehman; Gaztañaga, E.; A Gontcho, Satya Gontcho; Gordon, C.; Medellin Gonzalez, Stefany Guadalupe; Guy, J.; Herrera-Alcantar, Hiram K.; Jiang, L.; Juneau, S.; Karaçaylı, N.G.; Kehoe, R.; Kisner, T.; Kovács, A.; Landriau, M.; Levi, Michael E.; Magneville, C.; Martini, P.; Meisner, Aaron M.; Mezcua, M.; Miquel, R.; Camacho, P. Montero; Moustakas, J.; Muñoz-Gutiérrez, Andrea; Myers, Adam D.; Nadathur, S.; Napolitano, L.; Nie, J.D.; Palanque-Delabrouille, N.; Pan, Z.; Percival, W.J.; Pérez-Ràfols, I.; Poppett, C.; Prada, F.; Ramírez-Pérez, César; Ravoux, C....
Authors
Tamara M. Davis
E. Chaussidon
V.A. Fawcett
Alma X. Gonzalez-Morales
Ting-Wen Lan
Christophe Yèche
S. Ahlen
J.N. Aguilar
E. Armengaud
S. Bailey
D. Brooks
Z. Cai
R. Canning
A. Carr
S. Chabanier
Marie-Claude Cousinou
K. Dawson
A. de la Macorra
A. Dey
Biprateep Dey
G. Dhungana
Professor Alastair Edge alastair.edge@durham.ac.uk
Professor
S. Eftekharzadeh
K. Fanning
James Farr
A. Font-Ribera
J. Garcia-Bellido
Lehman Garrison
E. Gaztañaga
Satya Gontcho A Gontcho
C. Gordon
Stefany Guadalupe Medellin Gonzalez
J. Guy
Hiram K. Herrera-Alcantar
L. Jiang
S. Juneau
N.G. Karaçaylı
R. Kehoe
T. Kisner
A. Kovács
M. Landriau
Michael E. Levi
C. Magneville
P. Martini
Aaron M. Meisner
M. Mezcua
R. Miquel
P. Montero Camacho
J. Moustakas
Andrea Muñoz-Gutiérrez
Adam D. Myers
S. Nadathur
L. Napolitano
J.D. Nie
N. Palanque-Delabrouille
Z. Pan
W.J. Percival
I. Pérez-Ràfols
C. Poppett
F. Prada
César Ramírez-Pérez
C. Ravoux
D.J. Rosario
M. Schubnell
Gregory Tarlé
M. Walther
B. Weiner
S. Youles
Zhimin Zhou
H. Zou
Siwei Zou
Abstract
A key component of the Dark Energy Spectroscopic Instrument (DESI) survey validation (SV) is a detailed visual inspection (VI) of the optical spectroscopic data to quantify key survey metrics. In this paper we present results from VI of the quasar survey using deep coadded SV spectra. We show that the majority (≈70%) of the main-survey targets are spectroscopically confirmed as quasars, with ≈16% galaxies, ≈6% stars, and ≈8% low-quality spectra lacking reliable features. A nonnegligible fraction of the quasars are misidentified by the standard spectroscopic pipeline, but we show that the majority can be recovered using post-pipeline "afterburner" quasar-identification approaches. We combine these "afterburners" with our standard pipeline to create a modified pipeline to increase the overall quasar yield. At the depth of the main DESI survey, both pipelines achieve a good-redshift purity (reliable redshifts measured within 3000 km s−1) of ≈99%; however, the modified pipeline recovers ≈94% of the visually inspected quasars, as compared to ≈86% from the standard pipeline. We demonstrate that both pipelines achieve a median redshift precision and accuracy of ≈100 km s−1 and ≈70 km s−1, respectively. We constructed composite spectra to investigate why some quasars are missed by the standard pipeline and find that they are more host-galaxy dominated (i.e., distant analogs of "Seyfert galaxies") and/or more dust reddened than the standard-pipeline quasars. We also show example spectra to demonstrate the overall diversity of the DESI quasar sample and provide strong-lensing candidates where two targets contribute to a single spectrum.
Citation
Alexander, D. M., Davis, T. M., Chaussidon, E., Fawcett, V., X. Gonzalez-Morales, A., Lan, T., …Zou, S. (2023). The DESI Survey Validation: Results from Visual Inspection of the Quasar Survey Spectra. Astronomical Journal, 165(3), Article 124. https://doi.org/10.3847/1538-3881/acacfc
Journal Article Type | Article |
---|---|
Acceptance Date | Nov 22, 2022 |
Online Publication Date | Feb 22, 2023 |
Publication Date | Mar 1, 2023 |
Deposit Date | Jun 8, 2023 |
Publicly Available Date | Jun 8, 2023 |
Journal | The Astronomical Journal |
Print ISSN | 0004-6256 |
Electronic ISSN | 1538-3881 |
Publisher | IOP Publishing |
Peer Reviewed | Peer Reviewed |
Volume | 165 |
Issue | 3 |
Article Number | 124 |
DOI | https://doi.org/10.3847/1538-3881/acacfc |
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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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