Herschel-HOBYS study of the earliest phases of high-mass star formation in NGC 6357

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Volume 625 (May 2019)

A&A, 625 (2019) A134

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Table 5

Velocity information for the MDCs associated with NGC 6357.

MDC	V_LSR	V_LSR	Line	HCO⁺	N₂ H⁺	V		Asymmetry	σ_turb	α_vir	V_LSR
	(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⁺	B≪R	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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