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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 3.

ISM density (n) and UV radiation field (GUV) derived from PDR modeling for the sample in this work. Our sources are denoted by the circles and color coded by redshift. We compare to the literature sample from Figure 2 with available [C I](1–0), mid − Jup CO, and far-infrared data. Overall, our galaxies span the same parameter space as other sources at high redshift, with a median n = 104.7±0.2 cm−3 and a median UV radiation field of GUV = 103.2±0.4 G0. The large scatter in GUV likely reflects the varied nature of the sources studied in this work.

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