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A Comparative Study of the Ground State Transitions of CO and C I as Molecular Gas Tracers at High Redshift

  • Authors: Marta Frias Castillo, Matus Rybak, Jacqueline A. Hodge, Paul van der Werf, Ian Smail, Joshua Butterworth, Jasper Jansen, Theodoros Topkaras, Chian-Chou Chen, Scott C. Chapman, Axel Weiss, Hiddo Algera, Jack E. Birkin, Elisabete da Cunha, Jianhang Chen, Helmut Dannerbauer, Soh Ikarashi, E. F. Jiménez-Andrade, Cheng-Lin Liao, Eric J. Murphy, A. M. Swinbank, Fabian Walter, Gabriela Calistro Rivera, R. J. Ivison, Claudia del P. Lagos

Marta Frias Castillo et al 2025 The Astrophysical Journal 987 .

  • Provider: AAS Journals

Caption: Figure 6.

Recovered ICO(1–0) (left), I[CI](1−0) (middle), and their ratio (right) as a function of redshift. For each panel, we plot the measured intensity at each redshift divided by the intrinsic intensity measured at z = 0, where TCMB = 2.73 K. We show three examples of H2 density, log(n) = 3, 4, and 5, as well as a range of gas kinetic temperatures, for a column density of NCO,C/dv = 1018 cm−2 km−1 s.

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