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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 2.

(a) HCO+ column density vs. CO column density in a log–log scale. (b) ﹩N({\mathrm{HCO}}^{+})/N(\mathrm{CO})﹩ ratio vs. CO column density in a log–log scale. The red dots are from our work and black dots are from Liszt & Lucas (1998, CO column density in Table 5) and Lucas & Liszt (1996, HCO+ column density in Table 2). The black dotted lines show the fit slope to the data points from all components (upper limits are not included).

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