The ALMA REBELS Survey: The Cosmic H i Gas Mass Density in Galaxies at z ≈ 7

  title={The ALMA REBELS Survey: The Cosmic H i Gas Mass Density in Galaxies at z ≈ 7},
  author={Kasper E. Heintz and Pascal A. Oesch and Manuel Aravena and Richard Bouwens and Pratika Dayal and A. Ferrara and Yoshinobu Fudamoto and Luca Graziani and Hanae Inami and Laura Sommovigo and Renske Smit and Mauro Stefanon and Michael W. Topping and Andrea Pallottini and Paul P. van der Werf},
  journal={The Astrophysical Journal Letters},
The neutral atomic gas content of individual galaxies at large cosmological distances has until recently been difficult to measure due to the weakness of the hyperfine H i 21 cm transition. Here we estimate the H i gas mass of a sample of main-sequence star-forming galaxies at z ∼ 6.5–7.8 surveyed for [C ii] 158 μm emission as part of the Reionization Era Bright Emission Line Survey (REBELS), using a recent calibration of the [C ii]-to-H i conversion factor. We find that the H i gas mass excess… 

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