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.
@article{arxiv.1607.01473,
title = {Holographic Beam Mapping of the CHIME Pathfinder Array},
author = {Philippe Berger and Laura B. Newburgh and Mandana Amiri and Kevin Bandura and Jean-Francois Cliche and Liam Connor and Meiling Deng and Nolan Denman and Matt Dobbs and Mateus Fandino and Adam J. Gilbert and Deborah Good and Mark Halpern and David Hanna and Adam D. Hincks and Gary Hinshaw and Carolin Hofer and Andre M. Johnson and Tom L. Landecker and Kiyoshi W. Masui and Juan Mena Parra and Niels Oppermann and Ue-Li Pen and Jeffrey B. Peterson and Andre Recnik and Timothy Robishaw and J. Richard Shaw and Seth Siegel and Kris Sigurdson and Kendrick Smith and Emilie Storer and Ian Tretyakov and Kwinten Van Gassen and Keith Vanderlinde and Donald Wiebe},
journal= {arXiv preprint arXiv:1607.01473},
year = {2016}
}
Comments
16 pages, 9 figures. Submitted to Proc. SPIE, Astronomical Telescopes + Instrumentation (2016)