2015AJ....150..159D

Query : 2015AJ....150..159D

2015AJ....150..159D - Astron. J., 150, 159 (2015/November-0)

Physical conditions of the earliest phases of massive star formation: single-dish and interferometric observations of ammonia and CCS in infrared dark clouds.

DIRIENZO W.J., BROGAN C., INDEBETOUW R., CHANDLER C.J., FRIESEN R.K. and DEVINE K.E.

Abstract (from CDS):

Infrared Dark Clouds (IRDCs) harbor the earliest phases of massive star formation, and many of the compact cores in IRDCs, traced by millimeter continuum or by molecular emission in high critical density lines, host massive young stellar objects (YSOs). We used the Robert C. Byrd Green Bank Telescope and the Karl G. Jansky Very Large Array (VLA) to map NH3 and CCS in nine IRDCs to reveal the temperature, density, and velocity structures and explore chemical evolution in the dense (> 1022/cm2) gas. Ammonia is an excellent molecular tracer for these cold, dense environments. The internal structure and kinematics of the IRDCs include velocity gradients, filaments, and possibly colliding clumps that elucidate the formation process of these structures and their YSOs. We find a wide variety of substructure including filaments and globules at distinct velocities, sometimes overlapping at sites of ongoing star formation. It appears that these IRDCs are still being assembled from molecular gas clumps even as star formation has already begun, and at least three of them appear consistent with the morphology of ''hub-filament structures'' discussed in the literature. Furthermore, we find that these clumps are typically near equipartition between gravitational and kinetic energies, so these structures may survive for multiple free-fall times.

Abstract Copyright: ∼

Journal keyword(s): dust, extinction - ISM: clouds - ISM: molecules - molecular data - radio lines: ISM - stars: formation

Nomenclature: Table 5: [DBI2015] JHHMMSS+DDMMSS N=81.

CDS comments: G028.83-00.19 is a probable misprint for G028.23-00.19.

Simbad objects: 110

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Number of rows : 110
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
2 3C 48 QSO 01 37 41.2996631208 +33 09 35.080388820   16.62 16.20     ~ 2924 2
3 NGC 1275 Bla 03 19 48.1599902040 +41 30 42.108850836   13.10 12.48 11.09   ~ 4243 3
4 NAME Perseus Cloud SFR 03 35.0 +31 13           ~ 1553 0
5 NAME Taurus Complex SFR 04 41.0 +25 52           ~ 4971 0
6 NAME 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
7 3C 273 BLL 12 29 06.6998257176 +02 03 08.597629980   13.05 14.830 14.11   ~ 6022 1
8 3C 286 Sy1 13 31 08.2883506368 +30 30 32.960091564   17.51 17.25     ~ 4558 2
9 3C 345 Bla 16 42 58.80997043 +39 48 36.9939552   16.81 16.59 16.84   ~ 1808 3
10 QSO B1730-130 Bla 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1198 1
11 QSO B1741-038 Bla 17 43 58.85613537 -03 50 04.6167326     20.40 17.98   ~ 583 1
12 4C 09.57 BLL 17 51 32.81857326 +09 39 00.7284066   17.46 16.78 15.57   ~ 1007 1
13 [DBI2015] J180944-194206 cor 18 09 44.0 -19 42 06           ~ 1 0
14 [DBI2015] J180945-194229 cor 18 09 45.0 -19 42 29           ~ 1 0
15 [DBI2015] J180945-194207 cor 18 09 45.0 -19 42 07           ~ 1 0
16 AGAL G010.742-00.126 Y*O 18 09 45.9 -19 42 04           ~ 19 0
17 AGAL G010.751-00.122 cor 18 09 46 -19 41.5           ~ 9 0
18 QSO J1820-2528 QSO 18 20 57.84869964 -25 28 12.5840414   18.56       ~ 115 1
19 [CCE98b] 019.30+0.07 Cld 18 25 56.78 -12 04 25.0           ~ 13 0
20 PMN J1832-1035 rG 18 32 20.83647 -10 35 11.1968           ~ 107 1
21 MSXDC G022.56-00.20 Cld 18 32 59.6 -09 20 08           ~ 1 0
22 [DBI2015] J183300-092004 cor 18 33 00.0 -09 20 04           ~ 1 0
23 [DBI2015] J183300-091959 cor 18 33 00.0 -09 19 59           ~ 1 0
24 [DBI2015] J183301-091956 cor 18 33 01.0 -09 19 56           ~ 1 0
25 [DBI2015] J183539-071855 cor 18 35 39.0 -07 18 55           ~ 1 0
26 MSXDC G024.60+00.08 DNe 18 35 39.40 -07 18 50.9           ~ 9 0
27 [DBI2015] J183540-071906 cor 18 35 40.0 -07 19 06           ~ 1 0
28 [DBI2015] J183540-071831 cor 18 35 40.0 -07 18 31           ~ 1 0
29 AGAL G024.633+00.152 Y*O 18 35 40.0 -07 18 40           ~ 14 0
30 [DBI2015] J183541-071908 cor 18 35 41.0 -07 19 08           ~ 1 0
31 [DBI2015] J183541-071803 cor 18 35 41.0 -07 18 03           ~ 1 0
32 [DBI2015] J184329-041251 cor 18 43 29.0 -04 12 51           ~ 1 0
33 [DBI2015] J184329-041234 cor 18 43 29.0 -04 12 34           ~ 1 0
34 [DBI2015] J184329-041227 cor 18 43 29.0 -04 12 27           ~ 1 0
35 [DBI2015] J184330-041332 cor 18 43 30.0 -04 13 32           ~ 1 0
36 [DBI2015] J184330-041309 cor 18 43 30.0 -04 13 09           ~ 1 0
37 [DBI2015] J184330-041259 cor 18 43 30.0 -04 12 59           ~ 1 0
38 [DBI2015] J184330-041230 cor 18 43 30.0 -04 12 30           ~ 1 0
39 [DBI2015] J184331-041323 cor 18 43 31.0 -04 13 23           ~ 1 0
40 MSXDC G028.23-00.19 DNe 18 43 31.3 -04 13 18           ~ 27 0
41 [DBI2015] J184924-005007 cor 18 49 24.0 -00 50 07           ~ 1 0
42 [DBI2015] J184925-005009 cor 18 49 25.0 -00 50 09           ~ 1 0
43 [DBI2015] J184926-005028 cor 18 49 26.0 -00 50 28           ~ 1 0
44 [DBI2015] J184926-004952 cor 18 49 26.0 -00 49 52           ~ 1 0
45 [DBI2015] J184928-004939 cor 18 49 28.0 -00 49 39           ~ 1 0
46 [DBI2015] J184928-004830 cor 18 49 28.0 -00 48 30           ~ 1 0
47 [DBI2015] J184929-004853 cor 18 49 29.0 -00 48 53           ~ 1 0
48 [DBI2015] J184929-004803 cor 18 49 29.0 -00 48 03           ~ 1 0
49 [DBI2015] J184930-004818 cor 18 49 30.0 -00 48 18           ~ 1 0
50 [DBI2015] J184930-004723 cor 18 49 30.0 -00 47 23           ~ 1 0
51 [DBI2015] J184930-004646 cor 18 49 30.0 -00 46 46           ~ 1 0
52 [DBI2015] J184931-004717 cor 18 49 31.0 -00 47 17           ~ 1 0
53 [DBI2015] J184931-004709 cor 18 49 31.0 -00 47 09           ~ 1 0
54 [DBI2015] J184931-004646 cor 18 49 31.0 -00 46 46           ~ 1 0
55 [DBI2015] J184931+004641 cor 18 49 31.0 +00 46 41           ~ 1 0
56 [DBI2015] J184932-004804 cor 18 49 32.0 -00 48 04           ~ 1 0
57 [DBI2015] J184932-004659 cor 18 49 32.0 -00 46 59           ~ 1 0
58 [DBI2015] J184932-004629 cor 18 49 32.0 -00 46 29           ~ 1 0
59 [DBI2015] J184933-004733 cor 18 49 33.0 -00 47 33           ~ 1 0
60 [DBI2015] J184933-004715 cor 18 49 33.0 -00 47 15           ~ 1 0
61 MSXDC G031.97+00.07 DNe 18 49 33.7 -00 47 48           ~ 16 0
62 [DBI2015] J184934-004644 cor 18 49 34.0 -00 46 44           ~ 1 0
63 QSO J1851+005 QSO 18 51 46.72295 +00 35 32.3649           ~ 138 1
64 [DBI2015] J185203+002109 cor 18 52 03.0 +00 21 09           ~ 1 0
65 [DBI2015] J185205+002054 cor 18 52 05.0 +00 20 54           ~ 1 0
66 MSXDC G032.70-00.30 Cld 18 52 06.2 +00 20 26           ~ 1 0
67 [DBI2015] J185207+002006 cor 18 52 07.0 +00 20 06           ~ 1 0
68 [DBI2015] J185315+012658 cor 18 53 15.0 +01 26 58           ~ 1 0
69 [DBI2015] J185316+012630 cor 18 53 16.0 +01 26 30           ~ 1 0
70 [DBI2015] J185317+012345 cor 18 53 17.0 +01 23 45           ~ 1 0
71 [DBI2015] J185317+012359 cor 18 53 17.0 +01 23 59           ~ 1 0
72 [DBI2015] J185317+012432 cor 18 53 17.0 +01 24 32           ~ 1 0
73 [DBI2015] J185317+012652 cor 18 53 17.0 +01 26 52           ~ 1 0
74 [DBI2015] J185318+012451 cor 18 53 18.0 +01 24 51           ~ 1 0
75 [DBI2015] J185318+012513 cor 18 53 18.0 +01 25 13           ~ 1 0
76 [DBI2015] J185318+012537 cor 18 53 18.0 +01 25 37           ~ 1 0
77 [DBI2015] J185318+012637 cor 18 53 18.0 +01 26 37           ~ 1 0
78 AGAL G034.411+00.234 Y*O 18 53 18.0319 +01 25 25.500           ~ 108 0
79 AGAL G034.401+00.226 cor 18 53 18.6 +01 24 40           ~ 74 1
80 MSXDC G034.43+00.24 MoC 18 53 18.9 +01 26 39           ~ 122 0
81 [DBI2015] J185319+012313 cor 18 53 19.0 +01 23 13           ~ 1 0
82 [DBI2015] J185319+012627 cor 18 53 19.0 +01 26 27           ~ 1 0
83 [DBI2015] J185319+012749 cor 18 53 19.0 +01 27 49           ~ 1 0
84 AGAL G034.459+00.247 Y*O 18 53 20.4 +01 28 23           ~ 71 0
85 [DBI2015] J185321+012308 cor 18 53 21.0 +01 23 08           ~ 1 0
86 [DBI2015] J185321+012657 cor 18 53 21.0 +01 26 57           ~ 1 0
87 [DBI2015] J185707+020841 cor 18 57 07.0 +02 08 41           ~ 1 0
88 [DBI2015] J185708+020752 cor 18 57 08.0 +02 07 52           ~ 1 0
89 [DBI2015] J185708+020803 cor 18 57 08.0 +02 08 03           ~ 1 0
90 [DBI2015] J185708+020825 cor 18 57 08.0 +02 08 25           ~ 1 0
91 AGAL G035.487-00.294 Y*O 18 57 09 +02 08.4           ~ 7 0
92 [DBI2015] J185709+020708 cor 18 57 09.0 +02 07 08           ~ 1 0
93 MSXDC G035.39-00.33 MoC 18 57 09.0 +02 07 46           ~ 132 0
94 [DBI2015] J185709+020752 cor 18 57 09.0 +02 07 52           ~ 1 0
95 [DBI2015] J185710+020736 cor 18 57 10.0 +02 07 36           ~ 1 0
96 [CPA2006] N75 bub 19 03 47.1 +05 09 27           ~ 40 0
97 GAL 038.91-00.44 bub 19 03 56.1 +05 06 53           ~ 18 0
98 [DBI2015] J190406+050850 cor 19 04 06.0 +05 08 50           ~ 1 0
99 [DBI2015] J190407+050847 cor 19 04 07.0 +05 08 47           ~ 1 0
100 [DBI2015] J190407+050946 cor 19 04 07.0 +05 09 46           ~ 1 0
101 [DBI2015] J190408+050856 cor 19 04 08.0 +05 08 56           ~ 1 0
102 [DBI2015] J190408+050909 cor 19 04 08.0 +05 09 09           ~ 1 0
103 [DBI2015] J190408+050930 cor 19 04 08.0 +05 09 30           ~ 1 0
104 MSXDC G038.95-00.47 DNe 19 04 08.3 +05 08 49           ~ 17 0
105 [DBI2015] J190410+050843 cor 19 04 10.0 +05 08 43           ~ 1 0
106 [DBI2015] J190410+050854 cor 19 04 10.0 +05 08 54           ~ 1 0
107 [DBI2015] J190410+050905 cor 19 04 10.0 +05 09 05           ~ 1 0
108 [DBI2015] J190410+050914 cor 19 04 10.0 +05 09 14           ~ 1 0
109 GAL 039.30-01.04 HII 19 04 19.00 +05 06 42.7           ~ 4 0
110 3C 454.3 Bla 22 53 57.7480438728 +16 08 53.561508864   16.57 16.10 15.22   ~ 3004 2

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