2017ApJ...835..278S

Query : 2017ApJ...835..278S

2017ApJ...835..278S - Astrophys. J., 835, 278-278 (2017/February-1)

Physical properties of molecular clouds at 2 pc resolution in the low-metallicity dwarf galaxy NGC 6822 and the Milky Way.

SCHRUBA A., LEROY A.K., KRUIJSSEN J.M.D., BIGIEL F., BOLATTO A.D., DE BLOK W.J.G., TACCONI L., VAN DISHOECK E.F. and WALTER F.

Abstract (from CDS):

We present the Atacama Large Millimeter/submillimeter Array survey of CO(2-1) emission from the 1/5 solar metallicity, Local Group dwarf galaxy NGC 6822. We achieve high (0′′ / . 9~2 pc) spatial resolution while covering a large area: four 250 pc x 250 pc regions that encompass ∼2/3 of NGC 6822's star formation. In these regions, we resolve ∼150 compact CO clumps that have small radii (∼2-3 pc), narrow line width (∼1 km s–1), and low filling factor across the galaxy. This is consistent with other recent studies of low-metallicity galaxies, but here shown with a 15×larger sample. At parsec scales, CO emission correlates with 8 µm emission better than with 24 µm emission and anticorrelates with Hα, so that polycyclic aromatic hydrocarbon emission may be an effective tracer of molecular gas at low metallicity. The properties of the CO clumps resemble those of similar-size structures in Galactic clouds except of slightly lower surface brightness and with CO-to-H2 ratio ∼1-2x the Galactic value. The clumps exist inside larger atomic-molecular complexes with masses typical for giant molecular clouds. Using dust to trace H2 for the entire complex, we find the CO-to-H2 ratio to be ∼20–25×the Galactic value, but with strong dependence on spatial scale and variations between complexes that may track their evolutionary state. The H2-to-H I ratio is low globally and only mildly above unity within the complexes. The ratio of star formation rate to H2 is ∼3–5×higher in the complexes than in massive disk galaxies, but after accounting for the bias from targeting star-forming regions, we conclude that the global molecular gas depletion time may be as long as in massive disk galaxies.

Abstract Copyright: © 2017. The American Astronomical Society. All rights reserved.

Journal keyword(s): galaxies: individual: NGC 6822 - H II regions - ISM: clouds - radio lines: ISM - radio lines: ISM

VizieR on-line data: <Available at CDS (J/ApJ/835/278): table6.dat>

Nomenclature: Table 6: [SLK2017] NNN (Nos 1-156).

Simbad objects: 175

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Number of rows : 175
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 IC 10 rG 00 20 17.33520 +59 18 13.6480   13.6 9.5     ~ 1185 1
2 NAME SMC G 00 52 38.0 -72 48 01   2.79 2.2     ~ 12317 1
3 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
4 NAME Heart Nebula HII 02 32.7 +61 27           ~ 336 1
5 NAME Magellanic Clouds GrG 03 00 -71.0           ~ 7988 0
6 NAME Per Arm PoG 03 30 +45.0           ~ 1672 0
7 NAME LMC G 05 23 34.6 -69 45 22     0.4     ~ 19090 0
8 NAME 30 Dor Region reg 05 38.0 -69 06           ~ 261 0
9 QSO B1730-130 Bla 17 33 02.70578907 -13 04 49.5482119   18 19.50 18.78 17.39 ~ 1198 1
10 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
11 QSO B1921-293 BLL 19 24 51.05595254 -29 14 30.1210248   18.71 18.21 15.07   ~ 918 1
12 QSO B1936-155 Bla 19 39 26.65775171 -15 25 43.0584711   19.44 20.30 18.80   ~ 180 1
13 [SLK2017] 86 MoC 19 44 30.7028152872 -14 41 36.507555564           ~ 1 0
14 [SLK2017] 89 MoC 19 44 31.5 -14 41 50           ~ 1 0
15 [SLK2017] 96 MoC 19 44 31.5 -14 41 50           ~ 1 0
16 [SLK2017] 85 MoC 19 44 31.6 -14 41 51           ~ 1 0
17 [H77] HII 2 HII 19 44 31.79 -14 41 57.0   15       ~ 34 0
18 [SLK2017] 94 MoC 19 44 32.1 -14 42 05           ~ 1 0
19 [SLK2017] 95 MoC 19 44 32.3 -14 42 10           ~ 1 0
20 [SLK2017] 98 MoC 19 44 32.3 -14 42 05           ~ 1 0
21 [SLK2017] 92 MoC 19 44 32.4127082784 -14 42 04.214772504           ~ 1 0
22 [SLK2017] 87 MoC 19 44 32.5 -14 42 05           ~ 1 0
23 [SLK2017] 99 MoC 19 44 32.9 -14 42 19           ~ 1 0
24 [SLK2017] 97 MoC 19 44 33.1 -14 42 24           ~ 1 0
25 [SLK2017] 100 MoC 19 44 33.4 -14 42 15           ~ 1 0
26 [SLK2017] 93 MoC 19 44 33.4 -14 42 15           ~ 1 0
27 [SLK2017] 102 MoC 19 44 33.5 -14 42 14           ~ 1 0
28 [SLK2017] 101 MoC 19 44 33.9 -14 42 38           ~ 1 0
29 MCG-02-50-003 HII 19 44 34.38 -14 42 20.3           ~ 36 0
30 [SLK2017] 88 MoC 19 44 34.7 -14 42 32           ~ 1 0
31 [SLK2017] 90 MoC 19 44 34.8 -14 42 32           ~ 1 0
32 [SLK2017] 91 MoC 19 44 35.2 -14 42 43           ~ 1 0
33 [SLK2017] 103 MoC 19 44 46.6 -14 52 48           ~ 1 0
34 [SLK2017] 105 MoC 19 44 46.6 -14 52 47           ~ 1 0
35 [SLK2017] 106 MoC 19 44 46.7561703072 -14 52 41.236155552           ~ 1 0
36 [SLK2017] 111 MoC 19 44 46.8 -14 52 33           ~ 1 0
37 [SLK2017] 123 MoC 19 44 47.1 -14 52 33           ~ 1 0
38 [SLK2017] 131 MoC 19 44 48.1 -14 53 01           ~ 1 0
39 [SLK2017] 142 MoC 19 44 48.1 -14 53 00           ~ 1 0
40 [SLK2017] 136 MoC 19 44 48.2 -14 52 30           ~ 1 0
41 [SLK2017] 154 MoC 19 44 48.3 -14 52 28           ~ 1 0
42 [SLK2017] 149 MoC 19 44 48.5 -14 52 33           ~ 1 0
43 [SLK2017] 108 MoC 19 44 48.8 -14 52 50           ~ 1 0
44 [SLK2017] 113 MoC 19 44 48.9 -14 52 52           ~ 1 0
45 [SLK2017] 129 MoC 19 44 48.9 -14 52 48           ~ 1 0
46 [SLK2017] 150 MoC 19 44 48.9 -14 52 46           ~ 1 0
47 [SLK2017] 153 MoC 19 44 48.9 -14 52 33           ~ 1 0
48 [SLK2017] 128 MoC 19 44 48.9 -14 52 32           ~ 1 0
49 [SLK2017] 114 MoC 19 44 48.9 -14 52 31           ~ 1 0
50 [SLK2017] 112 MoC 19 44 48.9 -14 52 30           ~ 1 0
51 [SLK2017] 107 MoC 19 44 48.9 -14 52 29           ~ 1 0
52 [SLK2017] 117 MoC 19 44 49.0 -14 52 58           ~ 1 0
53 [SLK2017] 156 MoC 19 44 49.0 -14 52 55           ~ 1 0
54 [SLK2017] 118 MoC 19 44 49.1 -14 52 53           ~ 1 0
55 [SLK2017] 127 MoC 19 44 49.1 -14 52 47           ~ 1 0
56 [SLK2017] 120 MoC 19 44 49.2 -14 52 58           ~ 1 0
57 [SLK2017] 130 MoC 19 44 49.3 -14 53 16           ~ 1 0
58 [SLK2017] 116 MoC 19 44 49.3 -14 52 48           ~ 1 0
59 [SLK2017] 109 MoC 19 44 49.4 -14 52 53           ~ 1 0
60 [SLK2017] 125 MoC 19 44 49.4321021352 -14 52 58.863772164           ~ 1 0
61 [SLK2017] 122 MoC 19 44 49.6 -14 52 51           ~ 1 0
62 [SLK2017] 126 MoC 19 44 49.7 -14 52 56           ~ 1 0
63 [SLK2017] 132 MoC 19 44 49.7291874648 -14 52 58.437425532           ~ 1 0
64 [SLK2017] 115 MoC 19 44 50.0 -14 53 03           ~ 1 0
65 [SLK2017] 135 MoC 19 44 50.0 -14 53 01           ~ 1 0
66 [SLK2017] 104 MoC 19 44 50.0 -14 52 38           ~ 1 0
67 [SLK2017] 137 MoC 19 44 50.1 -14 53 02           ~ 1 0
68 [SLK2017] 121 MoC 19 44 50.1 -14 52 44           ~ 1 0
69 [SLK2017] 146 MoC 19 44 50.2 -14 53 05           ~ 1 0
70 [SLK2017] 155 MoC 19 44 50.2 -14 52 56           ~ 1 0
71 [SLK2017] 138 MoC 19 44 50.2 -14 52 48           ~ 1 0
72 [SLK2017] 140 MoC 19 44 50.2 -14 52 44           ~ 1 0
73 [SLK2017] 110 MoC 19 44 50.2 -14 52 37           ~ 1 0
74 [SLK2017] 145 MoC 19 44 50.3 -14 52 52           ~ 1 0
75 [SLK2017] 143 MoC 19 44 50.3002262952 -14 52 56.276975784           ~ 1 0
76 [SLK2017] 139 MoC 19 44 50.4 -14 52 48           ~ 1 0
77 [SLK2017] 133 MoC 19 44 50.5 -14 52 43           ~ 1 0
78 [SLK2017] 147 MoC 19 44 50.8 -14 52 53           ~ 1 0
79 [SLK2017] 152 MoC 19 44 50.8 -14 52 40           ~ 1 0
80 [SLK2017] 134 MoC 19 44 50.9 -14 53 06           ~ 1 0
81 [SLK2017] 144 MoC 19 44 50.9 -14 52 47           ~ 1 0
82 [SLK2017] 148 MoC 19 44 51.2 -14 52 44           ~ 1 0
83 [SLK2017] 80 MoC 19 44 51.3 -14 43 03           ~ 1 0
84 [SLK2017] 141 MoC 19 44 52.1 -14 51 58           ~ 1 0
85 [SLK2017] 119 MoC 19 44 52.1 -14 51 57           ~ 1 0
86 [H25] IV HII 19 44 52.18 -14 51 58.1           ~ 17 0
87 [SLK2017] 124 MoC 19 44 52.2 -14 51 58           ~ 1 0
88 [SLK2017] 151 MoC 19 44 52.3 -14 52 42           ~ 1 0
89 [SLK2017] 53 MoC 19 44 52.3 -14 43 06           ~ 1 0
90 [SLK2017] 81 MoC 19 44 52.3 -14 43 00           ~ 1 0
91 [SLK2017] 69 MoC 19 44 52.4 -14 43 05           ~ 1 0
92 [SLK2017] 64 MoC 19 44 52.4 -14 43 02           ~ 1 0
93 [SLK2017] 84 MoC 19 44 52.5 -14 43 12           ~ 1 0
94 [SLK2017] 62 MoC 19 44 52.5 -14 43 09           ~ 1 0
95 [SLK2017] 45 MoC 19 44 52.5 -14 43 08           ~ 1 0
96 [SLK2017] 68 MoC 19 44 52.5 -14 43 05           ~ 1 0
97 [SLK2017] 33 MoC 19 44 52.6 -14 43 07           ~ 1 0
98 [SLK2017] 29 MoC 19 44 52.7 -14 43 14           ~ 1 0
99 [SLK2017] 38 MoC 19 44 52.7 -14 43 12           ~ 1 0
100 [SLK2017] 66 MoC 19 44 52.7 -14 43 09           ~ 1 0
101 [SLK2017] 73 MoC 19 44 52.8 -14 43 15           ~ 1 0
102 [H25] V HII 19 44 52.84 -14 43 09.8           ~ 69 0
103 [SLK2017] 51 MoC 19 44 52.9 -14 43 11           ~ 1 0
104 [SLK2017] 32 MoC 19 44 52.9 -14 43 08           ~ 1 0
105 [SLK2017] 55 MoC 19 44 53.0 -14 43 13           ~ 1 0
106 [SLK2017] 83 MoC 19 44 53.0 -14 42 56           ~ 1 0
107 [SLK2017] 25 MoC 19 44 53.1 -14 43 31           ~ 1 0
108 [SLK2017] 50 MoC 19 44 53.1 -14 43 11           ~ 1 0
109 [SLK2017] 56 MoC 19 44 53.1 -14 43 09           ~ 1 0
110 [SLK2017] 63 MoC 19 44 53.1 -14 43 07           ~ 1 0
111 [SLK2017] 27 MoC 19 44 53.1 -14 43 07           ~ 1 0
112 [SLK2017] 39 MoC 19 44 53.3 -14 43 11           ~ 1 0
113 [SLK2017] 41 MoC 19 44 53.3 -14 42 59           ~ 1 0
114 [SLK2017] 54 MoC 19 44 53.3 -14 42 58           ~ 1 0
115 [SLK2017] 57 MoC 19 44 53.4 -14 43 08           ~ 1 0
116 [SLK2017] 82 MoC 19 44 53.4 -14 43 07           ~ 1 0
117 [SLK2017] 31 MoC 19 44 53.4 -14 42 58           ~ 1 0
118 [SLK2017] 49 MoC 19 44 53.5 -14 43 21           ~ 1 0
119 [SLK2017] 59 MoC 19 44 53.5 -14 43 15           ~ 1 0
120 [SLK2017] 52 MoC 19 44 53.5 -14 43 08           ~ 1 0
121 [SLK2017] 22 MoC 19 44 53.5 -14 42 59           ~ 1 0
122 [SLK2017] 23 MoC 19 44 53.5 -14 42 58           ~ 1 0
123 [SLK2017] 61 MoC 19 44 53.6 -14 43 11           ~ 1 0
124 [SLK2017] 60 MoC 19 44 53.7 -14 43 12           ~ 1 0
125 [SLK2017] 28 MoC 19 44 53.7 -14 43 06           ~ 1 0
126 [SLK2017] 78 MoC 19 44 53.8 -14 43 09           ~ 1 0
127 [SLK2017] 26 MoC 19 44 53.8 -14 42 31           ~ 1 0
128 [SLK2017] 67 MoC 19 44 53.8781495712 -14 43 05.520878472           ~ 1 0
129 [SLK2017] 44 MoC 19 44 53.9 -14 43 08           ~ 1 0
130 [SLK2017] 58 MoC 19 44 53.9 -14 42 30           ~ 1 0
131 [SLK2017] 37 MoC 19 44 54.0 -14 43 18           ~ 1 0
132 [SLK2017] 43 MoC 19 44 54.0 -14 43 17           ~ 1 0
133 [SLK2017] 35 MoC 19 44 54.0 -14 43 04           ~ 1 0
134 [SLK2017] 48 MoC 19 44 54.1 -14 42 29           ~ 1 0
135 [SLK2017] 40 MoC 19 44 54.2 -14 43 00           ~ 1 0
136 [SLK2017] 65 MoC 19 44 54.2 -14 42 36           ~ 1 0
137 [SLK2017] 47 MoC 19 44 54.2 -14 42 31           ~ 1 0
138 [SLK2017] 24 MoC 19 44 54.2 -14 42 26           ~ 1 0
139 [SLK2017] 34 MoC 19 44 54.2 -14 42 26           ~ 1 0
140 [SLK2017] 30 MoC 19 44 54.3 -14 43 00           ~ 1 0
141 [SLK2017] 76 MoC 19 44 54.3 -14 42 42           ~ 1 0
142 [SLK2017] 70 MoC 19 44 54.3 -14 42 39           ~ 1 0
143 [SLK2017] 46 MoC 19 44 54.4 -14 43 02           ~ 1 0
144 [SLK2017] 79 MoC 19 44 54.4 -14 42 40           ~ 1 0
145 [SLK2017] 77 MoC 19 44 54.4 -14 42 38           ~ 1 0
146 [SLK2017] 72 MoC 19 44 54.4 -14 42 33           ~ 1 0
147 [SLK2017] 75 MoC 19 44 54.4814613960 -14 42 42.588475884           ~ 1 0
148 [SLK2017] 74 MoC 19 44 54.5 -14 42 44           ~ 1 0
149 [SLK2017] 42 MoC 19 44 54.5 -14 42 44           ~ 1 0
150 [SLK2017] 36 MoC 19 44 54.5 -14 42 40           ~ 1 0
151 [SLK2017] 71 MoC 19 44 54.5 -14 42 36           ~ 1 0
152 NGC 6822 G 19 44 56.199 -14 47 51.29   18 8.1     ~ 1661 0
153 [SLK2017] 3 MoC 19 45 01.7 -14 43 21           ~ 1 0
154 [SLK2017] 8 MoC 19 45 01.7 -14 43 21           ~ 1 0
155 [SLK2017] 5 MoC 19 45 01.7 -14 43 20           ~ 1 0
156 [SLK2017] 9 MoC 19 45 01.7 -14 43 19           ~ 1 0
157 [SLK2017] 7 MoC 19 45 01.9 -14 43 21           ~ 1 0
158 [SLK2017] 6 MoC 19 45 03.6 -14 43 41           ~ 1 0
159 [SLK2017] 2 MoC 19 45 03.6 -14 43 40           ~ 1 0
160 [SLK2017] 1 MoC 19 45 03.8 -14 43 36           ~ 1 0
161 [SLK2017] 4 MoC 19 45 03.8 -14 43 36           ~ 1 0
162 [SLK2017] 19 MoC 19 45 04.9 -14 43 14           ~ 1 0
163 [SLK2017] 13 MoC 19 45 04.9 -14 43 13           ~ 1 0
164 [SLK2017] 11 MoC 19 45 04.9 -14 43 13           ~ 1 0
165 [SLK2017] 10 MoC 19 45 05.1 -14 43 20           ~ 1 0
166 [SLK2017] 15 MoC 19 45 05.1 -14 43 20           ~ 1 0
167 [SLK2017] 18 MoC 19 45 05.1 -14 43 18           ~ 1 0
168 [SLK2017] 21 MoC 19 45 05.2 -14 43 20           ~ 1 0
169 KD D26 HII 19 45 05.2 -14 43 13           ~ 55 0
170 [SLK2017] 14 MoC 19 45 05.4 -14 43 24           ~ 1 0
171 [SLK2017] 12 MoC 19 45 05.4 -14 43 22           ~ 1 0
172 [SLK2017] 17 MoC 19 45 05.7358694400 -14 43 23.575872540           ~ 1 0
173 [SLK2017] 20 MoC 19 45 05.8 -14 43 29           ~ 1 0
174 [SLK2017] 16 MoC 19 45 05.8 -14 43 27           ~ 1 0
175 NAME Local Group GrG ~ ~           ~ 9325 0

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