Parameters for the modeling of the OH outflow.
|Parameter||Units||Meaning||Explored range (HVC)|
|R int||pc||Radius of the far-IR continuum sourcea||e|
|T dust||K||Dust temperature of the far-IR continuum source||90−200|
|τ 100||Continuum optical depth at 100 μm along a radial (Rint) path||0.5−4|
|Rout/Rint||Radius of the outflowing envelope relative to Rint||1.1−2.5f|
|v int||km s-1||Gas velocity at Rintb,c||1300−1700g|
|v out||km s-1||Gas velocity at Routb,c||100−400g|
|N OH||cm-2||OH column density from Rint to Routb,c||(0.5−5) × 1017|
|p f||pc||Limiting impact parameter for the calculation of emerging fluxes||Rint − Routh|
|f||Scaling factor d|
A uniform velocity gradient is adopted, so that the velocity field is given by v(r) = vint + dv/dr (r − Rint).
Representing either partial coverage by OH of the continuum source (a clumpy outflow, f < 1), or an ensemble of independent sources (f > 1). Ṁ scales as . f is not a fitting parameter, but indicates that the modeled source size is effective. Nevertheless, we argue in Sect. 4 that f ~ 1 for the QC, and in Sect. 3.3.1 that f ≳ 0.45 for the HVC.
See Fig. 11.
Accelerating velocity fields have been tried as well, but they yield poor fits to both the line profiles and the flux ratios.
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