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

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

2021 The Astrophysical Journal 923 217.

  • Provider: AAS Journals

Caption: Figure 3.

Left: A reconstructed image showing the layout of IFUs on the HET’s focal plane for data taken on 2020 June 16. This image is formed by collapsing the 4400–5200 Å spectral region of the VIRUS spectra from a science observation. The image shows the IFUs as being adjacent to each other in order to save space; each IFU is 51″ on a side. The open squares on the outsides of the array denote inactive IFUs; the open rectangle in the middle shows space occupied by other HET instruments. The streak seen in five of the IFUs (037, 047, 085, 095, and 104, where the first two digits represent horizontal numbering and the last digit gives vertical position) is from a moving object, most likely an asteroid or satellite. At the time the frame was taken, 71 IFUs were operational. Right: The same science observation showing the locations of the IFUs on sky. In this image north is up and east to the left; the IFUs are arrayed on a 100″ grid. The red circle has a diameter of 18′. Note that the IFUs are oriented in the direction of the parallactic angle and will therefore change with the azimuth of observation. The moving object is now obvious.

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