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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 8.

[C I] conversion factor α[C I] as a function of metallicity. The dark green band marks the value derived using X[C I]=(5.1 ± 1.8) × 10−5 for the sample of SMGs presented in this work. The light green band marks the SMG metallicities derived from [N II]/Hα by J. E. Birkin (2022). The black line represents the best-fit linear relation log α[C I] = −1/13 × log Z/Z⊙ + 1.33 from K. E. Heintz & D. Watson (2020). The solar/supersolar metallicities derived support the use of a higher (lower) X[C I] (αCO) in SMGs, rather than a universal value for different galaxy populations.

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