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Revealing the CO X-factor in Dark Molecular Gas through Sensitive ALMA Absorption Observations

  • Authors: Gan Luo, Di Li, Ningyu Tang, J. R. Dawson, John M. Dickey, L. Bronfman, Sheng-Li Qin, Steven J. Gibson, Richard Plambeck, Ricardo Finger, Anne Green, Diego Mardones, Bon-Chul Koo, and Nadia Lo

2020 The Astrophysical Journal Letters 889 L4.

  • Provider: AAS Journals

Caption: Figure 4.

Upper panel: The relation of the H2 column density and the H I column density. Lower panel: Relation of the H2 column density and the integrated intensity of CO (1–0). The red and black points denote sightlines using the ﹩{N}_{{\rm{H}}}/E(B-V)﹩ conversion factors of Nguyen et al. (2018) and Bohlin et al. (1978), respectively. The empty red circles denote sightlines with H I opacity correction. The red dotted lines show the fit results (points with an upper limit are not included).

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