Model fit for the OH doublets in Mrk 231. The blue, light-blue, dashed light-blue, and green curves show the contributions by the quiescent component (QC), high-excitation outflow component (HVC), low-velocity component (LVC), and low-excitation component (LEC), respectively. Red is the total emission and absorption due to all components. In this specific model, the parameters for the HVC are Tdust = 105 K, Rint = 74 pc, Rout/Rint = 1.3, NOH = 1.6 × 1017 cm-2, vint = 1700 km s-1, vout = 100 km s-1, and pf = 1.15 × Rint, and the mass-outflow rate per unit of solid angle is dṀ/dΩ ≈ 100 M⊙ yr-1 sr-1.
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