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Table 4

Densities, column densities, masses, and energetics.

Parameter QC HVC

nH (104 cm-3) 1−2a 0.04−0.3b
NH (1024 cm-2) 1.3−4 0.06−0.12
Mgas (108M) 2.5−5.0 0.2−0.4
(M yr-1) 500−1200
(1036 g cm s-2) ~5−7c,d
Lmech (1010L) ~6−10c,d
Tmech (1056 erg) ~2−4d

Notes. Assuming XOH = 2.5 × 10-6 relative to H nuclei and f = 1. Values scale inversely with the OH abundance relative to this assumed value. Only the best-constrained components, the QC and the HVC, are considered (see Sect. 3.4 for the LEC).


Average density (the medium is probably clumpy).


The two values correspond to the highest and lowest outflowing velocities (1700 and 100 km s-1, respectively).


Varies with velocity; values are given for v = 1000 km s-1.


Values are given for  = 850 M yr-1 and Rout/Rint = 1.3−1.5.

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