HETDEX Public Source Catalog 1: 220 K Sources Including Over 50 K Lyα Emitters from an Untargeted Wide-area Spectroscopic Survey*

Author:

Mentuch Cooper ErinORCID,Gebhardt KarlORCID,Davis DustinORCID,Farrow Daniel J.ORCID,Liu ChenxuORCID,Zeimann GregoryORCID,Ciardullo RobinORCID,Feldmeier John J.ORCID,Drory NivORCID,Jeong DonghuiORCID,Benda Barbara,Bowman William P.ORCID,Boylan-Kolchin MichaelORCID,Chávez Ortiz Óscar A.ORCID,Debski Maya H.ORCID,Dentler MonaORCID,Fabricius Maximilian,Farooq Rameen,Finkelstein Steven L.ORCID,Gawiser EricORCID,Gronwall CarylORCID,Hill Gary J.ORCID,Hopp UlrichORCID,House Lindsay R.ORCID,Janowiecki StevenORCID,Khoraminezhad HastiORCID,Kollatschny WolframORCID,Komatsu EiichiroORCID,Landriau MartinORCID,Niemeyer Maja LujanORCID,Lee HanshinORCID,MacQueen Phillip,Mawatari KenORCID,McKay Brianna,Ouchi MasamiORCID,Poppe Jennifer,Saito ShunORCID,Schneider Donald P.ORCID,Snigula JanORCID,Thomas Benjamin P.ORCID,Tuttle SarahORCID,Urrutia TanyaORCID,Weiss LaurelORCID,Wisotzki Lutz,Zhang YechiORCID,

Abstract

Abstract We present the first publicly released catalog of sources obtained from the Hobby-Eberly Telescope Dark Energy Experiment (HETDEX). HETDEX is an integral field spectroscopic survey designed to measure the Hubble expansion parameter and angular diameter distance at 1.88 < z < 3.52 by using the spatial distribution of more than a million Lyα-emitting galaxies over a total target area of 540 deg2. The catalog comes from contiguous fiber spectra coverage of 25 deg2 of sky from 2017 January through 2020 June, where object detection is performed through two complementary detection methods: one designed to search for line emission and the other a search for continuum emission. The HETDEX public release catalog is dominated by emission-line galaxies and includes 51,863 Lyα-emitting galaxy (LAE) identifications and 123,891 [O ii]-emitting galaxies at z < 0.5. Also included in the catalog are 37,916 stars, 5274 low-redshift (z < 0.5) galaxies without emission lines, and 4976 active galactic nuclei. The catalog provides sky coordinates, redshifts, line identifications, classification information, line fluxes, [O ii] and Lyα line luminosities where applicable, and spectra for all identified sources processed by the HETDEX detection pipeline. Extensive testing demonstrates that HETDEX redshifts agree to within Δz < 0.02, 96.1% of the time to those in external spectroscopic catalogs. We measure the photometric counterpart fraction in deep ancillary Hyper Suprime-Cam imaging and find that only 55.5% of the LAE sample has an r-band continuum counterpart down to a limiting magnitude of r ∼ 26.2 mag (AB) indicating that an LAE search of similar sensitivity to HETDEX with photometric preselection would miss nearly half of the HETDEX LAE catalog sample. Data access and details about the catalog can be found online at http://hetdex.org/. A copy of the catalogs presented in this work (Version 3.2) is available to download at Zenodo doi:10.5281/zenodo.7448504.

Publisher

American Astronomical Society

Subject

Space and Planetary Science,Astronomy and Astrophysics

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