The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections

Gebhardt, Karl; Mentuch Cooper, Erin; Ciardullo, Robin; Acquaviva, Viviana; Bender, Ralf; Bowman, William P.; Castanheira, Barbara G.; Dalton, Gavin; Davis, Dustin; de Jong, Roelof S.; DePoy, D. L.; Devarakonda, Yaswant; Dongsheng, Sun; Drory, Niv; Fabricius, Maximilian; Farrow, Daniel J.; Feldmeier, John; Finkelstein, Steven L.; Froning, Cynthia S.; Gawiser, Eric; Gronwall, Caryl; Herold, Laura; Hill, Gary J.; Hopp, Ulrich; House, Lindsay R.; Janowiecki, Steven; Jarvis, Matthew; Jeong, Donghui; Jogee, Shardha; Kakuma, Ryota; Kelz, Andreas; Kollatschny, W.; Komatsu, Eiichiro; Krumpe, Mirko; Landriau, Martin; Liu, Chenxu; Niemeyer, Maja Lujan; MacQueen, Phillip; Marshall, Jennifer; Mawatari, Ken; McLinden, Emily M.; Mukae, Shiro; Nagaraj, Gautam; Ono, Yoshiaki; Ouchi, Masami; Papovich, Casey; Sakai, Nao; Saito, Shun; Schneider, Donald P.; Schulze, Andreas; Shanmugasundararaj, Khavvia; Shetrone, Matthew; Sneden, Chris; Snigula, Jan; Steinmetz, Matthias; Thomas, Benjamin P.; Thomas, Brian...

Abstract

We describe the survey design, calibration, commissioning, and emission-line detection algorithms for the Hobby–Eberly Telescope Dark Energy Experiment (HETDEX). The goal of HETDEX is to measure the redshifts of over a million Lyα emitting galaxies between 1.88 < z < 3.52, in a 540 deg2 area encompassing a comoving volume of 10.9 Gpc3. No preselection of targets is involved; instead the HETDEX measurements are accomplished via a spectroscopic survey using a suite of wide-field integral field units distributed over the focal plane of the telescope. This survey measures the Hubble expansion parameter and angular diameter distance, with a final expected accuracy of better than 1%. We detail the project’s observational strategy, reduction pipeline, source detection, and catalog generation, and present initial results for science verification in the Cosmological Evolution Survey, Extended Groth Strip, and Great Observatories Origins Deep Survey North fields. We demonstrate that our data reach the required specifications in throughput, astrometric accuracy, flux limit, and object detection, with the end products being a catalog of emission-line sources, their object classifications, and flux-calibrated spectra.

Citation

Gebhardt, K., Mentuch Cooper, E., Ciardullo, R., Acquaviva, V., Bender, R., Bowman, W. P., …Zhang, Y. (2021). The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections. The Astrophysical journal, 923(2), Article 217. https://doi.org/10.3847/1538-4357/ac2e03

• Journal Article Type: Article
• Acceptance Date: Oct 7, 2021
• Online Publication Date: Dec 23, 2021
• Publication Date: Dec 20, 2021
• Deposit Date: May 17, 2024
• Publicly Available Date: May 17, 2024
• Journal: Astrophysical Journal
• Print ISSN: 0004-637X
• Electronic ISSN: 1538-4357
• Publisher: American Astronomical Society
• Peer Reviewed: Peer Reviewed
• Volume: 923
• Issue: 2
• Article Number: 217
• DOI: https://doi.org/10.3847/1538-4357/ac2e03
• Keywords: Dark energy
• Public URL: https://hull-repository.worktribe.com/output/4668485