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DESI Spectroscopy of HETDEX Emission-line Candidates. I. Line Discrimination Validation

Martin LandriauLBL, BerkeleyErin Mentuch CooperTexas UDustin DavisDepartment of Astronomy, The University of Texas at Austin, Austin, TX 78712, USAKarl GebhardtDepartment of Astronomy, The University of Texas at Austin, Austin, TX 78712, USARobin CiardulloDepartment of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USAE. ArmengaudSaclay—Commissariat à l'énergie atomique et aux énergies alternatives, IRFU, CEA, Université Paris-Saclay, F-91191 Gif-sur-Yvette, FranceArjun DeyNatl. Solar Observ., TucsonAnand RaichoorLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USADavid J. SchlegelLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAMichael WilsonDepartment of Astrophysical Sciences, Princeton University, Peyton Hall, Princeton, NJ 08544, USAJ. AguilarLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAS. AhlenPhysics Dept., Boston University, 590 Commonwealth Avenue, Boston, MA 02215, USADavide BianchiINAF-Osservatorio Astronomico di Brera, Via Brera 28, 20122 Milano, ItalyDavid BrooksDepartment of Physics & Astronomy, University College London, Gower Street, London, WC1E 6BT, UKT. ClaybaughLBL, BerkeleyAxel de la MacorraInstituto de Física, Universidad Nacional Autónoma de México, Circuito de la Investigación Científica, Ciudad Universitaria, Cd. de México C. P. 04510, MexicoS. FerraroUC, Berkeley, Math. DeptJ. E. Forero-RomeroAndes U., BogotaE. GaztañagaInstitute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX, UKSatya Gontcho A GontchoUniversity of Virginia, Department of Astronomy, Charlottesville, VA 22904, USAG. GutiérrezFermi National Accelerator Laboratory, PO Box 500, Batavia, IL 60510, USAChang Hoon HahnArizona U., Astron. Dept. - Steward ObservK. HonscheidDepartment of Physics, The Ohio State University, 191 West Woodruff Avenue, Columbus, OH 43210,USACullan HowlettSchool of Mathematics and Physics, University of Queensland, Brisbane, QLD 4072, AustraliaM IshakU. Texas, DallasS. JuneauNSF NOIRLab, 950 N. Cherry Avenue, Tucson, AZ 85719, USAR. KehoeDepartment of Physics, Southern Methodist University, 3215 Daniel Avenue, Dallas, TX 75275, USATheodore KisnerLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAAnthony KreminLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAL. Le GuillouSorbonne Université, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies (LPNHE), FR-75005 Paris, FranceM. E. LeviLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAMarc ManeraInstitut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Edifici Cn, Campus UAB, 08193, Bellaterra (Barcelona), SpainAaron MeisnerNatl. Solar Observ., TucsonR. MiquelInstitut de Física d'Altes Energies (IFAE), The Barcelona Institute of Science and Technology, Edifici Cn, Campus UAB, 08193, Bellaterra (Barcelona), SpainJohn MoustakasDepartment of Physics and Astronomy, Siena College, 515 Loudon Road, Loudonville, NY 12211, USAS. NadathurInstitute of Cosmology and Gravitation, University of Portsmouth, Dennis Sciama Building, Portsmouth, PO1 3FX, UKIgnasi Pérez-RàfolsBarcelona, Polytechnic UClaire PoppettUC, Berkeley (main)Francisco PradaInstituto de Astrofísica de Andalucía (CSIC), Glorieta de la Astronomía, s/n, E-18008 Granada, SpainGraziano RossiDepartment of Physics and Astronomy, Sejong University, 209 Neungdong-ro, Gwangjin-gu, Seoul 05006, Republic of KoreaE. SánchezCIEMAT, Avenida Complutense 40, E-28040 Madrid, SpainM. SchubnellSyracuse UDavid SprayberryNatl. Solar Observ., TucsonG. TarléMichigan UB. A. WeaverNatl. Solar Observ., TucsonRongpu ZhouLawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USAH. ZouBeijing ObservDaniel J. FarrowHull UGary J. HillDepartment of Astronomy, The University of Texas at Austin, Austin, TX 78712, USADonghui JeongDepartment of Astronomy and Astrophysics, The Pennsylvania State University, University Park, PA 16802, USAChenxu LiuSouth-Western Institute for Astronomy Research, Yunnan University, Kunming, Yunnan 650500, People's Republic of ChinaShun SaitoInstitute for Multi-messenger Astrophysics and Cosmology, Department of Physics, Missouri University of Science and Technology, 1315 N. Pine Street, Rolla, MO 65409, USADonald P. SchneiderPenn State U., Astron. Astrophys

The Astrophysical Journaljournal2025en

ABI

Annotatsiya

Abstract The Hobby–Eberly Dark Energy Experiment (HETDEX) is an untargeted spectroscopic galaxy survey that uses Ly α- emitting galaxies (LAEs) as tracers of 1.9 < z < 3.5 large-scale structure. Most detections consist of a single emission line, whose identity is inferred via a Bayesian analysis of ancillary data. To determine the accuracy of these line identifications, HETDEX detections were observed with the Dark Energy Spectroscopic Instrument (DESI). In two DESI pointings, high-confidence spectroscopic redshifts are obtained for 1157 sources, including 982 LAEs. The DESI spectra are used to evaluate the accuracy of the HETDEX object classifications and tune the methodology to achieve the HETDEX science requirement of ≲2% contamination of the LAE sample by low-redshift emission-line galaxies, while still assigning 96% of the true Ly α emission sample with the correct spectroscopic redshift. We compare emission-line measurements between the two experiments assuming a simple Gaussian line fitting model. Fitted values for the central wavelength of the emission line, the measured line flux, and line widths are consistent between the surveys within uncertainties. Derived spectroscopic redshifts, from the two classification pipelines, when both agree as an LAE classification, are consistent to within 〈Δ z /(1 + z )〉 = 6.9 × 10 −5 with an rms scatter of 3.3 × 10 −4 . Data are available at https://data.desi.lbl.gov/desi/public/dr1/vac/dr1/hetdex .

Mavzular

X-ray Spectroscopy and Fluorescence Analysis Laser-induced spectroscopy and plasma Electron and X-Ray Spectroscopy Techniques

Identifikatorlar

DOI: 10.3847/1538-4357/ae1ae6

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