Table 3
Comparison of the temperatures and Mach number of different regions.
| Region | H2CO | NH3 | CO | FIR | Mach number |
|---|---|---|---|---|---|
| K | K | K | K | ||
| W75S | 24−95 | 15−64 | 41(82/37) | 15−25 | 2.1−7.2 |
| DR21(OH) | 26−114 | 22−64 | 31(99/29) | 15−31 | 2.−7.0 |
| DR21 | 24−87 | 20−58 | 36(148/32) | 15−>22 | 1.9−6.7 |
| DR21W1 | 33−88 | 35−60 | 54(118/52) | 18−22 | 2.5−10.3 |
Notes. Column 2: kinetic temperatures derived from H2CO line ratios (see Sect. 3.4). Column 3: kinetic temperatures derived from the NH3 (2,2)/(1,1) line ratios taken from Keown et al. (2019). Column 4: average, warm, and cold components temperatures of low– to high–J CO taken from Jakob et al. (2007). Columns 5: far infrared (FIR) dust temperatures taken from Hennemann et al. (2012) and Cao et al. (2019). Columns 6: Mach number derived from H2CO (see Sect. 3.5).
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