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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 3.

The relation between the abundance of CO, HCO+, and ﹩{N}_{{{\rm{H}}}_{2}}﹩ (circles from our work, squares from Lucas & Liszt 1996; Liszt & Lucas 1998). The red and black points denote sightlines using the ﹩{N}_{{\rm{H}}}/E(B-V)﹩ conversion factor of Nguyen et al. (2018) and Bohlin et al. (1978), respectively. The empty red circles denote sightlines with H I opacity correction. The black dotted lines show the mean values of molecular abundance (points with upper limits are not included).

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