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Home All issues Volume 623 (March 2019) A&A, 623 (2019) A68 Full HTML
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Table 9

PDF widths, linewidths, Mach numbers, and parameters describing the turbulence of the velocity components.

vLSRa b c FWHMd Me ζf bg
(km s−1) (km s−1) 20 K 40 K 80 K 20 K 40 K 80 K 20 K 40 K 80 K
Galactic centre
− 105.9 0.49 ± 0.03 4.2 11.7 8.1 5.8 x x 0.63
                           
− 93.7 0.47 ± 0.09 4.6 12.8 8.9 6.4 x x 0.85
                           
− 81.5 0.43 ± 0.09 2.1 5.8 4.1 2.9 x 0.66 0.43
                           
− 74.6 0.50 ± 0.05 7.1 19.7 13.7 9.9 x x x
                           
− 3.2 0.56 ± 0.06 6.4 17.8 12.4 8.9 x x 0.89
                           
2.0 0.51 ± 0.08 9.4 26.1 18.2 13.1 x x x
                           
7.3 0.53 ± 0.14 6.1 16.9 11.8 8.5 x 0.89
                           
allh 0.54 ± 0.10 x
3 kpc arm
− 48.4 0.52 ± 0.16 4.2 11.7 8.1 5.8 x 0.82 0.50
                           
− 39.7 0.41 ± 0.11 4.1 11.4 7.9 5.7 x x x
                           
allh 0.48 ± 0.15
4 kpc arm
− 27.6 0.39 ± 0.08 7.6 21.1 14.7 10.6 x x x
                           
− 18.9 0.43 ± 0.08 8.2 22.8 15.9 11.4 x x x
                           
allh 0.41 ± 0.08
Scutum arm
24.7 0.61 ± 0.10 4.1 11.4 7.9 5.7 0.72 0.48 0.38
                           
31.6 0.52 ± 0.09 10.2 28.3 19.7 14.2 x x x
                           
36.9 0.56 ± 0.14 7.4 20.5 14.3 10.3 x x 0.94
                           
allh 0.56 ± 0.12
Sagittarius arm
17.7 0.49 ± 0.08 6.5 18.0 12.6 9.0 x x 0.89

Notes. The molecules used for this analysis are c-C3 H2, H13CO+, 13CO, CS, SO, SiO, HNC, and CH3OH. (a) Channel velocities of c-C3 H2. (b) Mean width of the PDF. (c)Median width of the PDF. (d)Median FWHM for each velocity component determined with c-C3 H2. (e) Mach number for three assumed temperatures. (f)Forcing parameter ζ. x means that there is no intersection of the two functions b(ζ). In these cases, we assume f = 2.9 to derive b. (g) Forcing parameter b. (h) Mean and median values of the PDF width for each sub-sample of clouds.

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