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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 5.

X[C I]/α850 (left) and αCO × α850 (right) factors as a function of redshift for our sample. The mean value for the sample in this work is shown as a black dashed line, and the gray-shaded region represents the 1σ standard deviation around the sample mean. For comparison, we show the z ∼ 1 MS galaxies from ASPECS (L. A. Boogaard et al. 2020) and high-redshift SMGs (F. Walter et al. 2011; S. Alaghband-Zadeh et al. 2013; M. S. Bothwell et al. 2017; R. Cañameras et al. 2018; K. C. Harrington et al. 2018; N. P. H. Nesvadba et al. 2019). We do not find evidence for any trends with redshift or LIR (not shown) for either pair.

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