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Detection of cosmological 21 cm emission with the Canadian hydrogen intensity mapping experiment

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DOIResolve DOI: https://doi.org/10.3847/1538-4357/acb13f
AuthorSearch for: ORCID identifier: https://orcid.org/0000-0001-6523-9029; Search for: ORCID identifier: https://orcid.org/0000-0003-3772-2798; Search for: ORCID identifier: https://orcid.org/0000-0003-0173-6274; Search for: 1ORCID identifier: https://orcid.org/0000-0001-8123-7322; Search for: ORCID identifier: https://orcid.org/0000-0001-7166-6422; Search for: ORCID identifier: https://orcid.org/0000-0002-6899-1176; Search for: 1ORCID identifier: https://orcid.org/0000-0002-0190-2271; Search for: ORCID identifier: https://orcid.org/0000-0002-1760-0868; Search for: 1ORCID identifier: https://orcid.org/0000-0001-7301-5666; Search for: ORCID identifier: https://orcid.org/0000-0002-4241-8320; Search for: ORCID identifier: https://orcid.org/0000-0003-4887-8114; Search for: ORCID identifier: https://orcid.org/0000-0002-3354-3859; Search for: 1ORCID identifier: https://orcid.org/0000-0003-1455-2546; Search for: ORCID identifier: https://orcid.org/0000-0001-8064-6116; Search for: ORCID identifier: https://orcid.org/0000-0002-4279-6946; Search for: ORCID identifier: https://orcid.org/0000-0002-0772-9326; Search for: ORCID identifier: https://orcid.org/0000-0001-8292-0051; Search for: ORCID identifier: https://orcid.org/0000-0002-2626-5985; Search for: ORCID identifier: https://orcid.org/0000-0002-7333-5552; Search for: 1ORCID identifier: https://orcid.org/0000-0002-2465-8937; Search for: ORCID identifier: https://orcid.org/0000-0003-2155-9578; Search for: ORCID identifier: https://orcid.org/0000-0002-9516-3245; Search for: ORCID identifier: https://orcid.org/0000-0002-5283-933X; Search for: ORCID identifier: https://orcid.org/0000-0001-6967-7253; Search for: ORCID identifier: https://orcid.org/0000-0003-3463-7918; Search for: ORCID identifier: https://orcid.org/0000-0002-4543-4588; Search for: ORCID identifier: https://orcid.org/0000-0003-2631-6217; Search for: ORCID identifier: https://orcid.org/0000-0001-7755-902X; Search for: ORCID identifier: https://orcid.org/0000-0003-4535-9378; Search for: ORCID identifier: https://orcid.org/0000-0002-1491-3738; Search for: ORCID identifier: https://orcid.org/0000-0002-6669-3159; Search for: ORCID identifier: https://orcid.org/0000-0001-7314-9496
Affiliation
  1. National Research Council of Canada. Herzberg Astronomy and Astrophysics
FunderSearch for: Canada Foundation for Innovation; Search for: National Science Foundation
FormatText, Article
Subjectcosmology; large-scale structure of the universe; H I line emission; quasars; emission line galaxies
Abstract
We present a detection of 21 cm emission from large-scale structure (LSS) between redshift 0.78 and 1.43 made with the Canadian Hydrogen Intensity Mapping Experiment. Radio observations acquired over 102 nights are used to construct maps that are foreground filtered and stacked on the angular and spectral locations of luminous red galaxies (LRGs), emission-line galaxies (ELGs), and quasars (QSOs) from the eBOSS clustering catalogs. We find decisive evidence for a detection when stacking on all three tracers of LSS, with the logarithm of the Bayes factor equal to 18.9 (LRG), 10.8 (ELG), and 56.3 (QSO). An alternative frequentist interpretation, based on the likelihood ratio test, yields a detection significance of 7.1σ (LRG), 5.7σ (ELG), and 11.1σ (QSO). These are the first 21 cm intensity mapping measurements made with an interferometer.
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PublisherIOP
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  • The Astrophysical Journal 947, no. 1, 16 (12 April 2023): 1–59.
LanguageEnglish
Peer reviewedYes
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Record identifier6b60bfaa-8fb4-49e9-86ed-a9eb6f37cac9
Record created2023-08-03
Record modified2023-08-03
Date modified: