Figure 1 from Revealing the CO X-factor in Dark Molecular Gas through Sensitive ALMA Absorption Observations

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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 1.

(a) Comparison of absorption spectra obtained through self- (black curve) and normal (blue curve) calibration. (b) Spectra of ﹩{\rm{H}}\,{\rm{I}}﹩, CO, and HCO⁺ (solid line) toward 3C454.3. The red dashed lines show the Gaussian fit profiles for each line, and the green dotted lines show each of the Gaussian components. The x-axis and y-axis denote the velocity range in ﹩\mathrm{km}\,{{\rm{s}}}^{-1}\,﹩ and the normalized line intensity, respectively.

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