Probing fragmentation and velocity sub-structure in the massive NGC 6334 filament with ALMA

Y. Shimajiri; Ph. André; E. Ntormousi; A. Men’shchikov; D. Arzoumanian; P. Palmeirim

doi:10.1051/0004-6361/201935689

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Volume 632 (December 2019)

A&A, 632 (2019) A83

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Table 2

Results of compact source extractions on the ALMA 12 m-only 3.1 mm continuum map.

ID ⁽¹⁾	RA	Dec	R_major × R_minor	PA		S/N		M_tot		Velocity channel at which	Association with
										source is detected in N₂H⁺	N₂H⁺ features
	[hms]	[dms]	[′′ × ′′ ] ^{(2), (3)}	[deg]⁽²⁾	[mJy/beam] ⁽²⁾	[σ]	[mJy] ⁽²⁾	[M_⊙ ] ⁽⁴⁾	[×10⁶ cm⁻³] ⁽⁵⁾	[km s⁻¹]
1	17:20:43.13	−35:47:54.9	2.9 × 2.3 (0.02 pc × 0.02 pc)	1	5.1 ± 0.2	36.4	11.4	31.5	11.1	[−2.2, −1.8]	F-2
2	17:20:41.78	−35:48:9.2	2.8 × 1.7 (0.02 pc × 0.01 pc)	10	6.9 ± 0.2	49.2	13.5	13.8	8.1		No N₂H⁺
3	17:20:45.00	−35:46:42.7	1.7 × 0.8 (0.01 pc × 0.01 pc)	−33	2.9 ± 0.2	21.0	4.1	11.2	42.5	−1.2 ⁽⁶⁾
4	17:20:43.56	−35:47:51.4	2.2 × 1.1 (0.02 pc × 0.01 pc)	36	3.0 ± 0.2	21.4	4.7	12.8	22.6	[−1.4, −1.2]	F-2
5	17:20:43.16	−35:47:46.6	1.2 × 0.8 (0.01 pc × 0.01 pc)	−8	2.5 ± 0.2	18.2	3.2	8.9	54.3	[−2.6, −2.4],[−2.0, −1.8]	F-1
6	17:20:44.66	−35:46:54.3	1.7 × 1.3 (0.01 pc × 0.01 pc)	6	2.4 ± 0.2	17.0	3.5	9.6	19.1	[−3.0, −2.8],[−1.8],[−1.4, −1.2]	F-2
7	17:20:44.51	−35:47:0.8	2.0 × 1.1 (0.02 pc × 0.01 pc)	−32	2.4 ± 0.2	17.3	3.7	10.1	19.1	−3.8, −2.8 ⁽⁶⁾	F-1(marginal)/F-3(marginal)
8	17:20:40.42	−35:48:51.1	1.9 × 1.4 (0.02 pc × 0.01 pc)	−22	3.0 ± 0.2	21.5	4.7	12.9	18.5	[−2.6, −1.4]
9	17:20:44.48	−35:47:17.1	1.9 × 1.5 (0.02 pc × 0.01 pc)	40	2.7 ± 0.2	19.4	4.3	11.9	14.7	[−2.8, −2.6],[−1.8, −1.2]	F-2
10	17:20:39.27	−35:49:16.9	2.1 × 0.9 (0.02 pc × 0.01 pc)	35	3.3 ± 0.2	23.8	5.0	13.7	35.1	[−3.8, −3.0]	F-1
11	17:20:41.25	−35:48:18.3	1.5 × 1.0 (0.01 pc × 0.01 pc)	−39	2.3 ± 0.2	16.6	3.2	8.7	28.4	[−3.6, −2.6]
12	17:20:39.44	−35:49:2.8	2.4 × 1.4 (0.02 pc × 0.01 pc)	−42	3.5 ± 0.2	24.8	6.0	16.6	15.8	[−3.8, −2.4]
13	17:20:39.05	−35:49:20.7	2.4 × 0.9 (0.02 pc × 0.01 pc)	19	1.8 ± 0.2	13.1	2.9	8.1	15.3	−3.8 ⁽⁶⁾
14	17:20:45.52	−35:46:33.6	1.7 × 1.5 (0.01 pc × 0.01 pc)	−28	1.7 ± 0.2	12.1	2.6	7.1	10.7	[−3.2, −2.8],[−2.2, −2.0], −1.2	F-2
15 ⁽⁷⁾	17:20:41.58	−35:48:37.5	1.5 × 1.0 (0.01 pc × 0.01 pc)	−23	2.6 ± 0.2	18.3	2.1	7.0	24.4		No N₂H⁺/free−free contamination
16	17:20:43.38	−35:48:47.0	2.3 × 0.9 (0.02 pc × 0.01 pc)	−32	4.5 ± 0.2	32.3	7.1	19.6	37.8		No N₂H⁺/Out of main filament
17	17:20:39.39	−35:49:13.7	2.1 × 1.7 (0.02 pc × 0.01 pc)	6	3.9 ± 0.2	28.1	6.6	18.2	17.7	[−3.8, −2.8]
18	17:20:42.35	−35:48:34.2	2.0 × 1.7 (0.02 pc × 0.01 pc)	−39	4.8 ± 0.2	34.5	8.1	22.3	21.9	−3.4,[−1.6, −1.4]	free−free contamination
19 ⁽⁷⁾	17:20:40.97	−35:48:21.2	1.5 × 1.0 (0.01 pc × 0.01 pc)	−19	2.0 ± 0.2	13.9	1.8	5.4	18.6		No N₂H⁺
20	17:20:40.66	−35:48:39.4	1.3 × 1.0 (0.01 pc × 0.01 pc)	44	2.1 ± 0.2	15.0	2.8	7.6	31.0	[−3.4, −2.6]	F-1
21 ^{(7), (2)}	17:20:41.20	−35:48:28.5	1.4 × 0.9 (0.01 pc × 0.01 pc)	−33	1.1 ± 0.1	8.1	1.4	3.1	13.4	[−2.4, −1.2]	F-1
22	17:20:44.39	−35:47:26.4	2.1 × 1.6 (0.02 pc × 0.01 pc)	−2	2.2 ± 0.2	16.0	3.7	10.2	10.7	[−3.8, −3.2], [−1.8, −1.2]	F-2
23	17:20:41.65	−35:48:3.1	3.0 × 1.3 (0.02 pc × 0.01 pc)	44	1.7 ± 0.2	12.2	3.2	8.9	7.0	[−3.4, −2.4]	F-1
24	17:20:47.61	−35:47:53.7	1.6 × 1.5 (0.01 pc × 0.01 pc)	31	1.2 ± 0.2	8.3	1.7	4.8	8.1	[−3.4, −3.2], −2.0, −1.2	Out of main filament
25	17:20:42.87	−35:49:36.0	1.9 × 0.8 (0.02 pc × 0.01 pc)	34	1.9 ± 0.2	13.7	2.8	7.6	23.9		No N₂H⁺/Out of main filament
26	17:20:42.87	−35:48:6.6	2.0 × 0.2 (0.02 pc × 0.00 pc)	28	1.5 ± 0.2	10.5	2.0	5.6	141.9	[−1.4, −1.2]	F-2
27	17:20:38.94	−35:49:5.9	2.1 × 1.0 (0.02 pc × 0.01 pc)	−19	1.9 ± 0.2	13.6	2.9	7.9	17.0	[−2.2, −1.6]
28	17:20:41.88	−35:49:1.6	3.4 × 0.9 (0.03 pc × 0.01 pc)	−41	2.2 ± 0.2	16.0	4.3	11.9	14.4		No N₂H⁺/Out of main filament
29 ^{(7), (2)}	17:20:39.59	−35:48:42.6	1.4 × 0.9 (0.01 pc × 0.01 pc)	15	0.6 ± 0.1	4.5	0.3	1.7	7.4		No N₂H⁺
30	17:20:42.35	−35:49:31.8	1.7 × 1.7 (0.01 pc × 0.01 pc)	1	2.7 ± 0.2	19.1	4.2	11.6	14.6		No N₂H⁺/Out of main filament
31	17:20:44.42	−35:47:21.2	2.2 × 1.5 (0.02 pc × 0.01 pc)	22	2.1 ± 0.2	15.2	3.5	9.7	10.7	−3.8, [−2.0, −1.8]	F-2
32 ^{(7), (2)}	17:20:44.26	−35:49:14.1	1.4 × 0.9 (0.01 pc × 0.01 pc)	39	3.3 ± 0.1	23.4	1.1	9.0	38.5		No N₂H⁺/Out of main filament
33 ⁽⁷⁾	17:20:43.39	−35:47:57.3	1.5 × 1.0 (0.01 pc × 0.01 pc)	42	2.3 ± 0.2	16.4	0.7	6.3	21.9	−1.8 ⁽⁶⁾	F-2(marginal)
34	17:20:39.27	−35:47:59.3	2.3 × 1.3 (0.02 pc × 0.01 pc)	34	2.0 ± 0.2	14.4	3.4	9.2	10.7	[−3.8, −3.4], [−2.8, −2.6]	Out of main filament
35 ^{(7), (2)}	17:20:38.34	−35:48:32.4	1.4 × 0.9 (0.01 pc × 0.01 pc)	15	0.9 ± 0.1	6.7	1.2	2.6	11.0	−2.2 ⁽⁶⁾	Out of main filament
36	17:20:42.92	−35:49:24.7	2.1 × 1.9 (0.02 pc × 0.02 pc)	−19	3.8 ± 0.2	27.0	6.7	18.5	14.1		No N₂H⁺/Out of main filament
37	17:20:36.73	−35:48:56.6	1.9 × 1.4 (0.02 pc × 0.01 pc)	38	1.4 ± 0.2	9.9	2.2	6.0	8.4		No N₂H⁺/Out of main filament
38	17:20:43.44	−35:49:6.4	2.2 × 1.8 (0.02 pc × 0.01 pc)	−4	1.8 ± 0.2	12.9	3.1	8.7	7.2		No N₂H⁺/Out of main filament
39	17:20:40.25	−35:48:46.7	2.5 × 1.5 (0.02 pc × 0.01 pc)	−36	2.3 ± 0.2	16.4	4.0	11.1	10.0	[−2.6, −2.2]
40	17:20:42.82	−35:49:20.4	2.0 × 1.9 (0.02 pc × 0.02 pc)	0	3.4 ± 0.2	24.4	5.9	16.3	13.8		No N₂H⁺/Out of main filament

Notes. ⁽¹⁾ ID numbers of 3.1 mm compact sources associated with N₂H⁺ emission in two or more contiguous channels are labeled in bold. ⁽²⁾ Results of the 2D Gaussian fitting on the 12 m+7 m map. For IDs 21, 29, 32, 35, the 12 m map was used since the 3.1 mm continuum emission is not detected with a >3σ on the 12m+7m map. ⁽³⁾Deconvolved FWHM source diameters along the major and minor axes. ⁽⁴⁾We adopted T_dust = 20 K for all sources, except for source ID 2 for which we assumed T_dust = 50 K (see Sect. 3.3.1). ⁽⁵⁾Volume-averaged gas density derived assuming spheroidal cores as in Eq. (2). ⁽⁶⁾ Marginal N₂H⁺ detection since it is detected in only one channel for this source. ⁽⁷⁾ Deconvolved source size are not obtained since the structure is not resolved. The peak flux was used to estimate the mass.

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