Compact [C ii] emitters around a C iv absorption complex at redshift 5.7

Daichi Kashino (), Simon J. Lilly, Robert A. Simcoe, Rongmon Bordoloi, Ruari Mackenzie, Jorryt Matthee and Anna-Christina Eilers
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Daichi Kashino: Nagoya University
Simon J. Lilly: ETH Zürich
Robert A. Simcoe: MIT Kavli Institute for Astrophysics and Space Research
Rongmon Bordoloi: North Carolina State University
Ruari Mackenzie: ETH Zürich
Jorryt Matthee: ETH Zürich
Anna-Christina Eilers: MIT Kavli Institute for Astrophysics and Space Research

Nature, 2023, vol. 617, issue 7960, 261-264

Abstract: Abstract The physical conditions of the circumgalactic medium are investigated by means of intervening absorption-line systems in the spectrum of background quasi-stellar objects (QSOs) out to the epoch of cosmic reionization1–4. A correlation between the ionization state of the absorbing gas and the nature of the nearby galaxies has been suggested by the sources detected in either Lyα or [C ii] 158 μm near to, respectively, highly ionized and neutral absorbers5,6. This is also probably linked to the global changes in the incidence of absorption systems of different types and the process of cosmic reionization7–12. Here we report the detection of two [C ii]-emitting galaxies at redshift z ≈ 5.7 that are associated with a complex, high-ionization C iv absorption system. These objects are part of an overdensity of galaxies and have compact sizes (

Date: 2023
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DOI: 10.1038/s41586-023-05901-3

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