Figure 11 from Where is OH and Does It Trace the Dark Molecular Gas (DMG)?

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Where is OH and Does It Trace the Dark Molecular Gas (DMG)?

Authors: Di Li, Ningyu Tang, Hiep Nguyen, J. R. Dawson, Carl Heiles, Duo Xu, Zhichen Pan, c Paul F. Goldsmith, Steven J. Gibson, Claire E. Murray, Tim Robishaw, N. M. McClure-Griffiths, John Dickey, Jorge Pineda, Snežana Stanimirović, L. Bronfman, and Thomas Troland

2018 The Astrophysical Journal Supplement Series 235 1.

Provider: AAS Journals

Caption: Figure 11.

Histogram of hydrogen column density, N(H), for CNM (blue), DMG (filled gray), the DMG-threshold (red), and the molecular cloud (MG, green). N(H) contains contributions from H I for CNM, DMG, and the DMG-threshold cloud. Both H I and H₂ (transforming from CO measurements, N(H₂) = N(CO)/1 × 10⁻⁴) are included for the MG cloud. The left and right dashed lines represent N(H) = 9.4 × 10¹⁹ cm⁻² (visual extinction A_V =0.05 mag) and 3.8 × 10²¹ cm⁻² (A_V = 2 mag), respectively.

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