18 August 2016 Holographic beam mapping of the CHIME pathfinder array
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Abstract
The Canadian Hydrogen Intensity Mapping Experiment (CHIME) Pathfinder radio telescope is currently surveying the northern hemisphere between 400 and 800 MHz. By mapping the large scale structure of neutral hydrogen through its redshifted 21 cm line emission between z∼0.8-2.5 CHIME will contribute to our understanding of Dark Energy. Bright astrophysical foregrounds must be separated from the neutral hydrogen signal, a task which requires precise characterization of the polarized telescope beams. Using the DRAO John A. Galt 26 m telescope, we have developed a holography instrument and technique for mapping the CHIME Pathfinder beams. We report the status of the instrument and initial results of this effort.
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Philippe Berger, Philippe Berger, Laura B. Newburgh, Laura B. Newburgh, Mandana Amiri, Mandana Amiri, Kevin Bandura, Kevin Bandura, Jean-François Cliche, Jean-François Cliche, Liam Connor, Liam Connor, Meiling Deng, Meiling Deng, Nolan Denman, Nolan Denman, Matt Dobbs, Matt Dobbs, Mateus Fandino, Mateus Fandino, Adam J. Gilbert, Adam J. Gilbert, Deborah Good, Deborah Good, Mark Halpern, Mark Halpern, David Hanna, David Hanna, Adam D. Hincks, Adam D. Hincks, Gary Hinshaw, Gary Hinshaw, Carolin Höfer, Carolin Höfer, Andre M. Johnson, Andre M. Johnson, Tom L. Landecker, Tom L. Landecker, Kiyoshi W. Masui, Kiyoshi W. Masui, Juan Mena Parra, Juan Mena Parra, Niels Oppermann, Niels Oppermann, Ue-Li Pen, Ue-Li Pen, Jeffrey B. Peterson, Jeffrey B. Peterson, Andre Recnik, Andre Recnik, Timothy Robishaw, Timothy Robishaw, J. Richard Shaw, J. Richard Shaw, Seth Siegel, Seth Siegel, Kris Sigurdson, Kris Sigurdson, Kendrick Smith, Kendrick Smith, Emilie Storer, Emilie Storer, Ian Tretyakov, Ian Tretyakov, Kwinten Van Gassen, Kwinten Van Gassen, Keith Vanderlinde, Keith Vanderlinde, Donald Wiebe, Donald Wiebe, } "Holographic beam mapping of the CHIME pathfinder array", Proc. SPIE 9906, Ground-based and Airborne Telescopes VI, 99060D (18 August 2016); doi: 10.1117/12.2233782; https://doi.org/10.1117/12.2233782
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