The HETDEX Survey Emission-line Exploration and Source Classification
The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of the universe at z ∼ 2.4 to 1% precision for both H ( z ) and D _A ( z ). HETDEX is in the process of mapping in excess of one million Ly α emitting (LAE) galaxi...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2023-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/acb0ca |
| _version_ | 1827830753892761600 |
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| author | Dustin Davis Karl Gebhardt Erin Mentuch Cooper Robin Ciardullo Maximilian Fabricius Daniel J. Farrow John J. Feldmeier Steven L. Finkelstein Eric Gawiser Caryl Gronwall Gary J. Hill Ulrich Hopp Lindsay R. House Donghui Jeong Wolfram Kollatschny Eiichiro Komatsu Martin Landriau Chenxu Liu Shun Saito Sarah Tuttle Isak G. B. Wold Gregory R. Zeimann Yechi Zhang |
| author_facet | Dustin Davis Karl Gebhardt Erin Mentuch Cooper Robin Ciardullo Maximilian Fabricius Daniel J. Farrow John J. Feldmeier Steven L. Finkelstein Eric Gawiser Caryl Gronwall Gary J. Hill Ulrich Hopp Lindsay R. House Donghui Jeong Wolfram Kollatschny Eiichiro Komatsu Martin Landriau Chenxu Liu Shun Saito Sarah Tuttle Isak G. B. Wold Gregory R. Zeimann Yechi Zhang |
| author_sort | Dustin Davis |
| collection | DOAJ |
| description | The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of the universe at z ∼ 2.4 to 1% precision for both H ( z ) and D _A ( z ). HETDEX is in the process of mapping in excess of one million Ly α emitting (LAE) galaxies and a similar number of lower- z galaxies as a tracer of the large-scale structure. The success of the measurement is predicated on the post-observation separation of galaxies with Ly α emission from the lower- z interloping galaxies, primarily [O ii ], with low contamination and high recovery rates. The Emission Line eXplorer (ELiXer) is the principal classification tool for HETDEX, providing a tunable balance between contamination and completeness as dictated by science needs. By combining multiple selection criteria, ELiXer improves upon the 20 Å rest-frame equivalent width cut commonly used to distinguish LAEs from lower- z [O ii ] emitting galaxies. Despite a spectral resolving power, R ∼ 800, that cannot resolve the [O ii ] doublet, we demonstrate the ability to distinguish LAEs from foreground galaxies with 98.1% accuracy. We estimate a contamination rate of Ly α by [O ii ] of 1.2% and a Ly α recovery rate of 99.1% using the default ELiXer configuration. These rates meet the HETDEX science requirements. |
| first_indexed | 2024-03-12T04:33:51Z |
| format | Article |
| id | doaj.art-728db0d51dc34dc0b1eb21d25605c0c9 |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-03-12T04:33:51Z |
| publishDate | 2023-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-728db0d51dc34dc0b1eb21d25605c0c92023-09-03T09:58:19ZengIOP PublishingThe Astrophysical Journal1538-43572023-01-0194628610.3847/1538-4357/acb0caThe HETDEX Survey Emission-line Exploration and Source ClassificationDustin Davis0https://orcid.org/0000-0002-8925-9769Karl Gebhardt1https://orcid.org/0000-0002-8433-8185Erin Mentuch Cooper2https://orcid.org/0000-0002-2307-0146Robin Ciardullo3https://orcid.org/0000-0002-1328-0211Maximilian Fabricius4https://orcid.org/0000-0002-7025-6058Daniel J. Farrow5https://orcid.org/0000-0003-2575-0652John J. Feldmeier6https://orcid.org/0000-0003-2908-2620Steven L. Finkelstein7https://orcid.org/0000-0001-8519-1130Eric Gawiser8https://orcid.org/0000-0003-1530-8713Caryl Gronwall9https://orcid.org/0000-0001-6842-2371Gary J. Hill10https://orcid.org/0000-0001-6717-7685Ulrich Hopp11https://orcid.org/0000-0003-1008-225XLindsay R. House12https://orcid.org/0000-0002-1496-6514Donghui Jeong13https://orcid.org/0000-0002-8434-979XWolfram Kollatschny14https://orcid.org/0000-0002-0417-1494Eiichiro Komatsu15https://orcid.org/0000-0002-0136-2404Martin Landriau16https://orcid.org/0000-0003-1838-8528Chenxu Liu17https://orcid.org/0000-0001-5561-2010Shun Saito18https://orcid.org/0000-0002-6186-5476Sarah Tuttle19https://orcid.org/0000-0002-7327-565XIsak G. B. Wold20https://orcid.org/0000-0002-0784-1852Gregory R. Zeimann21https://orcid.org/0000-0003-2307-0629Yechi Zhang22https://orcid.org/0000-0003-3817-8739Department of Astronomy, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USADepartment of Astronomy, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USADepartment of Astronomy, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USA; McDonald Observatory, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USADepartment of Astronomy & Astrophysics, The Pennsylvania State University , University Park, PA 16802, USA; Institute for Gravitation and the Cosmos, The Pennsylvania State University , University Park, PA 16802, USAMax-Planck Institut für extraterrestrische Physik , Giessenbachstrasse 1, D-85748 Garching, Germany; Universitäts-Sternwarte , Fakultät für Physik, Ludwig-Maximilians Universität München, Scheinerstr. 1, D-81679 München, GermanyMax-Planck Institut für extraterrestrische Physik , Giessenbachstrasse 1, D-85748 Garching, Germany; Universitäts-Sternwarte , Fakultät für Physik, Ludwig-Maximilians Universität München, Scheinerstr. 1, D-81679 München, GermanyDepartment of Physics, Astronomy, Geology, and Environmental Sciences, Youngstown State University Youngstown , OH 44555, USADepartment of Astronomy, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USADepartment of Physics and Astronomy, Rutgers, The State University of New Jersey , Piscataway, NJ 08854, USADepartment of Astronomy & Astrophysics, The Pennsylvania State University , University Park, PA 16802, USA; Institute for Gravitation and the Cosmos, The Pennsylvania State University , University Park, PA 16802, USADepartment of Astronomy, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USA; McDonald Observatory, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USAMax-Planck Institut für extraterrestrische Physik , Giessenbachstrasse 1, D-85748 Garching, Germany; Universitäts-Sternwarte , Fakultät für Physik, Ludwig-Maximilians Universität München, Scheinerstr. 1, D-81679 München, GermanyDepartment of Astronomy, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USADepartment of Astronomy & Astrophysics, The Pennsylvania State University , University Park, PA 16802, USA; Institute for Gravitation and the Cosmos, The Pennsylvania State University , University Park, PA 16802, USAInstitut für Astrophysik, Universität Göttingen , Friedrich-Hund-Platz 1, D-37077 Göttingen, GermanyMax-Planck-Institut für Astrophysik , Karl-Schwarzschild-Str. 1, D-85741 Garching, Germany; Kavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, The University of Tokyo , Kashiwanoha, Kashiwa, Chiba 277-8583, JapanLawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720, USADepartment of Astronomy, The University of Texas at Austin , 2515 Speedway Boulevard, Austin, TX 78712, USAKavli Institute for the Physics and Mathematics of the Universe (WPI), Todai Institutes for Advanced Study, The University of Tokyo , Kashiwanoha, Kashiwa, Chiba 277-8583, Japan; Institute for Multi-messenger Astrophysics and Cosmology, Department of Physics, Missouri University of Science and Technology , 1315 N Pine St, Rolla, MO 65409, USADepartment of Astronomy, University of Washington , Seattle, 3910 15th Ave NE, Room C319, Seattle, WA 98195-0002, USAAstrophysics Science Division, Goddard Space Flight Center , Greenbelt, MD 20771, USA; Department of Physics, The Catholic University of America , Washington, DC 20064, USA; Center for Research and Exploration in Space Science and Technology , NASA/GSFC, Greenbelt, MD 20771, USAHobby-Eberly Telescope, University of Texas , Austin, Austin, TX 78712, USAInstitute for Cosmic Ray Research, The University of Tokyo , 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8582, Japan; Department of Astronomy, Graduate School of Science, The University of Tokyo , 7-3-1 Hongo, Bunkyo, Tokyo 113-0033, JapanThe Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) is an untargeted spectroscopic survey that aims to measure the expansion rate of the universe at z ∼ 2.4 to 1% precision for both H ( z ) and D _A ( z ). HETDEX is in the process of mapping in excess of one million Ly α emitting (LAE) galaxies and a similar number of lower- z galaxies as a tracer of the large-scale structure. The success of the measurement is predicated on the post-observation separation of galaxies with Ly α emission from the lower- z interloping galaxies, primarily [O ii ], with low contamination and high recovery rates. The Emission Line eXplorer (ELiXer) is the principal classification tool for HETDEX, providing a tunable balance between contamination and completeness as dictated by science needs. By combining multiple selection criteria, ELiXer improves upon the 20 Å rest-frame equivalent width cut commonly used to distinguish LAEs from lower- z [O ii ] emitting galaxies. Despite a spectral resolving power, R ∼ 800, that cannot resolve the [O ii ] doublet, we demonstrate the ability to distinguish LAEs from foreground galaxies with 98.1% accuracy. We estimate a contamination rate of Ly α by [O ii ] of 1.2% and a Ly α recovery rate of 99.1% using the default ELiXer configuration. These rates meet the HETDEX science requirements.https://doi.org/10.3847/1538-4357/acb0caDark energyEmission line galaxiesLyman-alpha galaxiesRedshift surveys |
| spellingShingle | Dustin Davis Karl Gebhardt Erin Mentuch Cooper Robin Ciardullo Maximilian Fabricius Daniel J. Farrow John J. Feldmeier Steven L. Finkelstein Eric Gawiser Caryl Gronwall Gary J. Hill Ulrich Hopp Lindsay R. House Donghui Jeong Wolfram Kollatschny Eiichiro Komatsu Martin Landriau Chenxu Liu Shun Saito Sarah Tuttle Isak G. B. Wold Gregory R. Zeimann Yechi Zhang The HETDEX Survey Emission-line Exploration and Source Classification The Astrophysical Journal Dark energy Emission line galaxies Lyman-alpha galaxies Redshift surveys |
| title | The HETDEX Survey Emission-line Exploration and Source Classification |
| title_full | The HETDEX Survey Emission-line Exploration and Source Classification |
| title_fullStr | The HETDEX Survey Emission-line Exploration and Source Classification |
| title_full_unstemmed | The HETDEX Survey Emission-line Exploration and Source Classification |
| title_short | The HETDEX Survey Emission-line Exploration and Source Classification |
| title_sort | hetdex survey emission line exploration and source classification |
| topic | Dark energy Emission line galaxies Lyman-alpha galaxies Redshift surveys |
| url | https://doi.org/10.3847/1538-4357/acb0ca |
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