Haochen Wang - An Overview of CHIME, the Canadian Hydrogen Intensity

Journal article

M. Amiri, K. Bandura, Ana Boskovic, Tianyue Chen, J. Cliche, M. Deng, N. Denman, M. Dobbs, M. Fandino, S. Foreman, M. Halpern, D. Hanna, A. Hill, G. Hinshaw, C. Höfer, Joseph W. Kania, P. Klages, T. Landecker, Joshua MacEachern, K. Masui, J. Mena-Parra, N. Milutinovic, A. Mirhosseini, L. Newburgh, Rick Nitsche, A. Ordog, U. Pen, T. Pinsonneault-Marotte, A. Polzin, A. Reda, A. Renard, J. Shaw, S. Siegel, Saurabh Singh, R. Smegal, I. Tretyakov, Kwinten Van Gassen, K. Vanderlinde, Haochen Wang, D. Wiebe, James S. Willis, D. Wulf
Astrophysical Journal Supplement Series, 2022

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APA Click to copy
Amiri, M., Bandura, K., Boskovic, A., Chen, T., Cliche, J., Deng, M., … Wulf, D. (2022). An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment. Astrophysical Journal Supplement Series.

Chicago/Turabian Click to copy
Amiri, M., K. Bandura, Ana Boskovic, Tianyue Chen, J. Cliche, M. Deng, N. Denman, et al. “An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment.” Astrophysical Journal Supplement Series (2022).

MLA Click to copy
Amiri, M., et al. “An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment.” Astrophysical Journal Supplement Series, 2022.

BibTeX Click to copy

@article{m2022a,
  title = {An Overview of CHIME, the Canadian Hydrogen Intensity Mapping Experiment},
  year = {2022},
  journal = {Astrophysical Journal Supplement Series},
  author = {Amiri, M. and Bandura, K. and Boskovic, Ana and Chen, Tianyue and Cliche, J. and Deng, M. and Denman, N. and Dobbs, M. and Fandino, M. and Foreman, S. and Halpern, M. and Hanna, D. and Hill, A. and Hinshaw, G. and Höfer, C. and Kania, Joseph W. and Klages, P. and Landecker, T. and MacEachern, Joshua and Masui, K. and Mena-Parra, J. and Milutinovic, N. and Mirhosseini, A. and Newburgh, L. and Nitsche, Rick and Ordog, A. and Pen, U. and Pinsonneault-Marotte, T. and Polzin, A. and Reda, A. and Renard, A. and Shaw, J. and Siegel, S. and Singh, Saurabh and Smegal, R. and Tretyakov, I. and Gassen, Kwinten Van and Vanderlinde, K. and Wang, Haochen and Wiebe, D. and Willis, James S. and Wulf, D.}
}

Abstract

The Canadian Hydrogen Intensity Mapping Experiment (CHIME) is a drift scan radio telescope operating across the 400–800 MHz band. CHIME is located at the Dominion Radio Astrophysical Observatory near Penticton, BC, Canada. The instrument is designed to map neutral hydrogen over the redshift range 0.8–2.5 to constrain the expansion history of the universe. This goal drives the design features of the instrument. CHIME consists of four parallel cylindrical reflectors, oriented north–south, each 100 m × 20 m and outfitted with a 256-element dual-polarization linear feed array. CHIME observes a two-degree-wide stripe covering the entire meridian at any given moment, observing three-quarters of the sky every day owing to Earth’s rotation. An FX correlator utilizes field-programmable gate arrays and graphics processing units to digitize and correlate the signals, with different correlation products generated for cosmological, fast radio burst, pulsar, very long baseline interferometry, and 21 cm absorber back ends. For the cosmology back end, the Nfeed2 correlation matrix is formed for 1024 frequency channels across the band every 31 ms. A data receiver system applies calibration and flagging and, for our primary cosmological data product, stacks redundant baselines and integrates for 10 s. We present an overview of the instrument, its performance metrics based on the first 3 yr of science data, and we describe the current progress in characterizing CHIME’s primary beam response. We also present maps of the sky derived from CHIME data; we are using versions of these maps for a cosmological stacking analysis, as well as for investigation of Galactic foregrounds.