Figure 6 from The Hobby–Eberly Telescope Dark Energy Experiment (HETDEX) Survey Design, Reductions, and Detections

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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 6.

Variations in the calibration of one typical IFU over three years of operation. Plots like these enable us to look for trends in the calibration of all IFUs in the VIRUS array. This set of data is for IFUslot 046, which feeds spectrograph 309. The six checks we apply are: background count level (top left), FWHM in pixels across the fiber profile (top right), separation in pixels between the first and last (112th) fiber on an amplifier (middle left), change in the wavelength solution (in Å) from the corner fibers of the IFU (middle right), normalization differences between the ratio of the corner fibers of the IFU (bottom left), and the overall normalization of the particular amplifier compared to the average of all the amplifiers in all the spectrographs (bottom right). The colors represent the four amplifiers of the IFU, with LL in black, LU in red, RL in green, and RU in blue.

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