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Table 5

Velocity information for the MDCs associated with NGC 6357.

MDC VLSR VLSR Line HCO+ N2 H+ V Asymmetry σturb αvir VLSR
(primary) (secondary) litterature
Id km s−1 km s−1 note note km s−1 km s−1 factor km s−1 km s−1
(1) (2) (3) (4) (5) (6) (7) (8) (9) (10) (11) (12)
IR-quiet protostellar MDC
6 −2.12 −5.24 HCO+ BR Reg −1.74 0.62 −0.26 0.57 0.15 −3.1

Starless MDC candidate
1 −4.15 HCO+ G Reg −4.17 0.88 +0.01 0.84 0.23 −3.5
5 −3.53 HCO+ Flat Faint −4.44 1.09 +0.36 1.05 1.03 −4.4
7 −3.40 HCO+ BS Reg −3.04 0.70 −0.22 0.64 0.47 −3.3
10 −4.24 HCO+ G Reg −4.45 0.80 +0.11 0.76 0.40 −4.6
11 −5.78 HCO+ G No det. 1.05 0.49 −5.1
12 −2.98 HCO+ BS Irr −1.39 1.49 −0.45 1.48 1.25 −1
14
17 −2.76 HCO+ BW Irr −2.41 0.63 −0.24 0.55 0.17 −2
18 −4
21 2.49 HCO+ G Reg 1.95 0.83 +0.28 0.79 0.72 +1.7
22 −4.12 HCO+ RS Reg −4.01 0.75 −0.06 0.70 0.31
23 −10.31 HCO+ RW 2P −10.64 0.66 +0.21 0.60 0.39 −10.9

Undefined cloud structure
2 −4.26 HCO+ G Reg −4.18 0.91 −0.03 0.87 0.25 −3.5
3 −4.23 HCO+ RW? No det. 1.08 1.11 +1.4
4 −4.84 12CO(3−2) (a) −4.2
8 −4.36 HCO+ BWRW Reg −4.24 0.52 −0.10 0.44 0.10 −4.5
9 −1.02 HCO+ G Irr −0.92 0.5 −0.09 0.43 0.30
13
15 −5.20 HCO+ RW No det. 1.47 1.15 −5.1
16 −3.42 HCO+ G Reg −3.26 0.61 −0.11 0.55 0.18 −3.3
19 −1.78 −5.66 HCO+ B»R Irr −5.59 0.68 −0.04 0.65 0.37
20 −4.90 HCO+ G no det. 1.38 2.91 −5.4

Notes. Column (4): line used for the velocity measurements given in Cols. 2 and 3. (a) Indicates a poor quality spectrum. Column (5): HCO+ line morphology. G: gaussian shape. BW (RW): wing on the blue (red) side. BS (RS): shoulder on the blue (red) side. Irr: irregular shape. B > R, B < R or B = R: the blue peak higher (smaller or equal) than the red one. Flat: means that it is a flat-top profile. Column (6): “Reg” means a regular hyperfine line structure while “Irr” suggests possible multiple components or low S/N. 2P: two different velocities along the line of sight. Column (12): velocity of the ATLASGAL clump from Urquhart et al. (2018).

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