2013MNRAS.435.2003H

Query : 2013MNRAS.435.2003H

2013MNRAS.435.2003H - Mon. Not. R. Astron. Soc., 435, 2003-2022 (2013/November-1)

The G305 star-forming complex: radio continuum and molecular line observations.

HINDSON L., THOMPSON M.A., URQUHART J.S., FAIMALI A., JOHNSTON-HOLLITT M., CLARK J.S. and DAVIES B.

Abstract (from CDS):

We present 109-115GHz (3mm) wide-field spectral line observations of 12CO, 13CO and C18O J = 1-0 molecular emission and 5.5 and 8.8GHz (6 and 3cm) radio continuum emission towards the high-mass star-forming complex known as G305. The morphology of G305 is dominated by a large evacuated cavity at the centre of the complex driven by clusters of O stars surrounded by molecular gas. Our goals are to determine the physical properties of the molecular environment and reveal the relationship between the molecular and ionized gas and star formation in G305. This is in an effort to characterize the star-forming environment and constrain the star formation history in an attempt to evaluate the impact of high-mass stars on the evolution of the G305 complex. Analysis of CO emission in G305 reveals 156 molecular clumps with the following physical characteristics; excitation temperatures ranging from 7 to 25K, optical depths of 0.2-0.9, H2 column densities of 0.1-4.0x1022/cm2, clump masses ranging from 102 to 104M☉ and a total molecular mass of >3.5x105M☉. The 5.5 and 8.8GHz radio continuum emission reveals an extended low surface brightness ionized environment within which we identify 15 large-scale features with a further eight smaller sources projected within these features. By comparing to mid-infrared emission and archival data, we identify nine Hii regions, seven compact Hii regions, one UC Hii region and four extended regions. The total integrated flux of the radio continuum emission at 5.5GHz is ∼ 180Jy corresponding to a Lyman continuum output of 2.4x1050 photons/s. We compare the ionized and molecular environment with optically identified high-mass stars and ongoing star formation, identified from the literature. Analysis of this data set reveals a star formation rate of 0.008-0.016M☉/yr and efficiency of 7-12 percent, allows us to probe the star formation history of the region and discuss the impact of high-mass stars on the evolution of G305.

Abstract Copyright: © 2013 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2013)

Journal keyword(s): stars: formation - ISM: clouds - Hii regions

VizieR on-line data: <Available at CDS (J/MNRAS/435/2003): table3.dat table4.dat>

Nomenclature: Tables 3-4: [HTU2013] NNN (Nos 1-156). Table 6: [HTU2013] GLLL.ll+BB.bbb N=21.

CDS comments: In Table 6, G305.270±0.007 is a probable misprint for G305.270-0.007. Calibrator PMN J1352-63 is not in Simbad.

Simbad objects: 205

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Number of rows : 205
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 30 Dor Nebula SFR 05 38 36.0 -69 05 11           ~ 1276 2
2 NGC 3603 OpC 11 14 57.9 -61 14 32           ~ 1136 1
3 NAME Crux-Scutum Spiral Arm reg 12 30 -60.0           ~ 323 0
4 3C 279 Bla 12 56 11.16657958 -05 47 21.5251510   18.01 17.75 15.87   ~ 3205 2
5 [HTU2013] 14 cor 13 08.2 -62 13           ~ 1 0
6 [HTU2013] 20 cor 13 08.2 -62 13           ~ 1 0
7 [HTU2013] 26 cor 13 08.2 -62 13           ~ 1 0
8 [HTU2013] 33 cor 13 08.2 -62 16           ~ 1 0
9 [HTU2013] 19 cor 13 08.4 -62 13           ~ 1 0
10 [HTU2013] 58 cor 13 08.5 -62 12           ~ 1 0
11 [HTU2013] 15 cor 13 08.5 -62 14           ~ 1 0
12 PMN J1308-6215 HII 13 08 32.5 -62 15 28           ~ 3 0
13 [HTU2013] 29 cor 13 08.5 -62 17           ~ 1 0
14 [HTU2013] G304.929+0.552 HII 13 08 36 -62 15.2           ~ 1 0
15 [HTU2013] 5 cor 13 08.6 -62 16           ~ 1 0
16 [HTU2013] 2 cor 13 08.7 -62 15           ~ 2 0
17 [HTU2013] 142 cor 13 10.0 -62 36           ~ 1 0
18 [HTU2013] 111 cor 13 10.1 -62 33           ~ 1 0
19 [HTU2013] 109 cor 13 10.1 -62 33           ~ 1 0
20 [HTU2013] 56 cor 13 10.1 -62 41           ~ 1 0
21 [HTU2013] 148 cor 13 10.1 -62 42           ~ 1 0
22 [HTU2013] 72 cor 13 10.1 -62 43           ~ 1 0
23 [HTU2013] 87 cor 13 10.1 -62 45           ~ 1 0
24 [HTU2013] 80 cor 13 10.2 -62 33           ~ 1 0
25 [HTU2013] 67 cor 13 10.2 -62 37           ~ 1 0
26 GAL 305.10+00.14 HII 13 10 17.5 -62 38 34           ~ 10 0
27 [HTU2013] 68 cor 13 10.3 -62 37           ~ 1 0
28 [HTU2013] 108 cor 13 10.3 -62 37           ~ 1 0
29 [HTU2013] 97 cor 13 10.3 -62 40           ~ 1 0
30 [HTU2013] 60 cor 13 10.3 -62 33           ~ 1 0
31 [HTU2013] 53 cor 13 10.4 -62 42           ~ 1 0
32 [HTU2013] 55 cor 13 10.4 -62 43           ~ 1 0
33 [HTU2013] 59 cor 13 10.4 -62 35           ~ 1 0
34 [HTU2013] 103 cor 13 10.5 -62 44           ~ 1 0
35 [HTU2013] 61 cor 13 10.7 -62 35           ~ 1 0
36 [HTU2013] 23 cor 13 10.7 -62 43           ~ 1 0
37 [HTU2013] 83 cor 13 10.7 -62 35           ~ 1 0
38 [HTU2013] 46 cor 13 10.8 -62 32           ~ 1 0
39 [HTU2013] 37 cor 13 10.8 -62 33           ~ 1 0
40 [HTU2013] 62 cor 13 10.9 -62 47           ~ 1 0
41 [HTU2013] G305.169+0.174 Rad 13 10 55 -62 36.8           ~ 1 0
42 [HTU2013] 125 cor 13 11.0 -62 44           ~ 1 0
43 [HTU2013] 147 cor 13 11.0 -62 44           ~ 1 0
44 [HTU2013] 137 cor 13 11.0 -62 47           ~ 1 0
45 [HTU2013] 64 cor 13 11.0 -62 48           ~ 1 0
46 [HTU2013] 51 cor 13 11.0 -62 48           ~ 1 0
47 [HTU2013] G305.197+0.206 HII 13 11 08 -62 34.7           ~ 2 0
48 [HTU2013] 50 cor 13 11.1 -62 48           ~ 1 0
49 [HTU2013] 11 cor 13 11.1 -62 33           ~ 1 0
50 [HTU2013] 24 cor 13 11.1 -62 33           ~ 1 0
51 [HTU2013] 126 cor 13 11.1 -62 34           ~ 1 0
52 [HTU2013] 155 cor 13 11.2 -62 45           ~ 1 0
53 [HTU2013] 152 cor 13 11.2 -62 45           ~ 1 0
54 [HTU2013] 25 cor 13 11.2 -62 45           ~ 1 0
55 [HTU2013] 8 cor 13 11.2 -62 47           ~ 1 0
56 [HTU2013] G305.195+0.033 HII 13 11 14 -62 45.1           ~ 1 0
57 [HTU2013] 21 cor 13 11.2 -62 34           ~ 1 0
58 [HTU2013] 115 cor 13 11.3 -62 45           ~ 1 0
59 [HTU2013] G305.199+0.021 HII 13 11 16 -62 45.8           ~ 1 0
60 [HTU2013] G305.215+0.200 HII 13 11 17 -62 35.0           ~ 1 0
61 GAL 305.20+00.02 HII 13 11 17.7 -62 45 46           ~ 9 0
62 [HTU2013] 120 cor 13 11.3 -62 32           ~ 1 0
63 [HTU2013] 124 cor 13 11.3 -62 43           ~ 1 0
64 [HTU2013] 146 cor 13 11.3 -62 43           ~ 1 0
65 [HTU2013] 121 cor 13 11.3 -62 43           ~ 1 0
66 [HTU2013] 151 cor 13 11.4 -62 29           ~ 1 0
67 [HTU2013] G305.223+0.202 HII 13 11 22 -62 34.9           ~ 1 0
68 [HTU2013] 78 cor 13 11.4 -62 39           ~ 1 0
69 [HTU2013] 69 cor 13 11.4 -62 51           ~ 1 0
70 [HTU2013] 1 cor 13 11.5 -62 31           ~ 1 0
71 [HTU2013] 89 cor 13 11.5 -62 43           ~ 1 0
72 [HTU2013] 16 cor 13 11.5 -62 29           ~ 1 0
73 [LCL2005b] G305.3+0.2 A2 * 13 11 33.88 -62 33 27.1           B0V-B1V 5 0
74 GAL 305.20+00.2 bub 13 11 35.1 -62 33 26           ~ 39 0
75 GAL 305.25+00.20 HII 13 11 37.5 -62 34 37           ~ 6 0
76 [HTU2013] G305.254+0.204 HII 13 11 38 -62 34.6           ~ 1 0
77 [LCL2005b] G305.3+0.2 A3 * 13 11 39.50 -62 33 28.2           B2V-B3V 4 0
78 [HTU2013] 12 cor 13 11.7 -62 49           ~ 1 0
79 [LCL2005b] G305.3+0.2 A1 * 13 11 41.04 -62 32 56.8           O5V-O6V 4 0
80 [HTU2013] 101 cor 13 11.7 -62 25           ~ 1 0
81 [HTU2013] 135 cor 13 11.8 -62 35           ~ 1 0
82 [HTU2013] G305.278+0.295 Rad 13 11 46 -62 29.0           ~ 1 0
83 [HTU2013] 100 cor 13 11.8 -62 37           ~ 1 0
84 [HTU2013] 4 cor 13 11.8 -62 49           ~ 1 0
85 [HTU2013] 32 cor 13 11.9 -62 27           ~ 1 0
86 [HTU2013] G305.277+0.161 Rad 13 11 51 -62 37.1           ~ 1 0
87 [HTU2013] 118 cor 13 11.9 -62 24           ~ 1 0
88 [HTU2013] G305.270-0.007 HII 13 11 55 -62 47.1           ~ 2 0
89 [HTU2013] 116 cor 13 12.0 -62 37           ~ 1 0
90 [HTU2013] 31 cor 13 12.0 -62 27           ~ 1 0
91 [HTU2013] 112 cor 13 12.1 -62 24           ~ 1 0
92 [HTU2013] 82 cor 13 12 -62.7           ~ 1 0
93 [HTU2013] 54 cor 13 12.1 -62 30           ~ 1 0
94 [HTU2013] 136 cor 13 12.2 -62 45           ~ 1 0
95 [HTU2013] 150 cor 13 12.2 -62 46           ~ 1 0
96 [HTU2013] 35 cor 13 12.2 -62 49           ~ 1 0
97 [HTU2013] 119 cor 13 12.2 -62 43           ~ 1 0
98 [HTU2013] 145 cor 13 12.2 -62 36           ~ 1 0
99 [HTU2013] 139 cor 13 12.3 -62 25           ~ 1 0
100 [HTU2013] 104 cor 13 12.3 -62 26           ~ 1 0
101 [HTU2013] 71 cor 13 12.3 -62 27           ~ 1 0
102 [HTU2013] 30 cor 13 12.3 -62 49           ~ 1 0
103 [HTU2013] 65 cor 13 12.3 -62 27           ~ 1 0
104 [HTU2013] G305.320+0.070 HII 13 12 17 -62 42.3           ~ 1 0
105 [HTU2013] 141 cor 13 12.4 -62 33           ~ 1 0
106 [HTU2013] 41 cor 13 12.4 -62 33           ~ 1 0
107 [HTU2013] 114 cor 13 12.4 -62 34           ~ 1 0
108 [HTU2013] 47 cor 13 12.4 -62 49           ~ 1 0
109 [HTU2013] 52 cor 13 12.4 -62 51           ~ 1 0
110 [CBC2012] Obj39 s*b 13 12 23.7315160176 -62 42 01.276975116     17.36     O3-B3I 6 0
111 [HTU2013] 90 cor 13 12.4 -62 37           ~ 1 0
112 [HTU2013] 127 cor 13 12.4 -62 45           ~ 1 0
113 WR 48-10 WR* 13 12 24.9913507440 -62 42 00.201886956     17.40     WNLh 11 0
114 [HTU2013] G305.348+0.223 HII 13 12 26 -62 33.0           ~ 2 0
115 WR 48-9 WR* 13 12 28.5638209632 -62 41 43.769380128     14.96     WNLh 17 0
116 [HTU2013] 123 cor 13 12.5 -62 43           ~ 1 0
117 Cl Danks 1 OpC 13 12 29.0 -62 41 56           ~ 80 0
118 [HTU2013] G305.353+0.193 HII 13 12 29 -62 34.8           ~ 1 0
119 [HTU2013] 18 cor 13 12.5 -62 33           ~ 1 0
120 [HTU2013] 134 cor 13 12.5 -62 34           ~ 1 0
121 [HTU2013] 10 cor 13 12.6 -62 35           ~ 1 0
122 [HTU2013] 13 cor 13 12.6 -62 35           ~ 1 0
123 [HTU2013] G305.358+0.152 Rad 13 12 34 -62 37.2           ~ 1 0
124 [HTU2013] 7 cor 13 12.6 -62 36           ~ 1 0
125 [HTU2013] G305.361+0.158 HII 13 12 35 -62 36.8           ~ 1 0
126 GAL 305.36+00.18 HII 13 12 35.2 -62 35 35           ~ 7 0
127 [HTU2013] 28 cor 13 12.6 -62 31           ~ 1 0
128 [HTU2013] 6 cor 13 12.6 -62 34           ~ 1 0
129 [HTU2013] G305.370+0.185 HII 13 12 39 -62 35.2           ~ 1 0
130 WR 48a WR* 13 12 39.6052790136 -62 42 55.939362876       16.081   WC6 106 0
131 [HTU2013] 27 cor 13 12.7 -62 32           ~ 1 0
132 [HTU2013] 66 cor 13 12.8 -62 36           ~ 1 0
133 Cl Danks 2 OpC 13 12 53.3 -62 40 52           ~ 73 0
134 [HTU2013] 39 cor 13 13 -62.6           ~ 1 0
135 [HTU2013] 34 cor 13 13.0 -62 34           ~ 1 0
136 NAME G305 Complex SFR 13 13 -62.7           ~ 72 0
137 [HTU2013] 138 cor 13 13.0 -62 29           ~ 1 0
138 [HTU2013] 36 cor 13 13.1 -62 31           ~ 1 0
139 [HTU2013] 88 cor 13 13.1 -62 32           ~ 1 0
140 [HTU2013] 48 cor 13 13.1 -62 33           ~ 1 0
141 [HTU2013] G305.439+0.211 Rad 13 13 13 -62 33.3           ~ 1 0
142 [HTU2013] 122 cor 13 13.4 -62 33           ~ 1 0
143 [HTU2013] 132 cor 13 13.5 -62 32           ~ 1 0
144 [HTU2013] 77 cor 13 13.5 -62 34           ~ 1 0
145 [HTU2013] 76 cor 13 13.6 -62 33           ~ 1 0
146 [HTU2013] 79 cor 13 13.8 -62 34           ~ 1 0
147 [HTU2013] G305.532+0.348 HII 13 13 55 -62 24.6           ~ 1 0
148 [HTU2013] 81 cor 13 13.9 -62 49           ~ 1 0
149 GAL 305.54+00.34 HII 13 13 57.8 -62 25 12           ~ 8 0
150 [HTU2013] 74 cor 13 14.1 -62 47           ~ 1 0
151 [HTU2013] 85 cor 13 14.1 -62 47           ~ 1 0
152 [HTU2013] 38 cor 13 14.1 -62 47           ~ 1 0
153 [HTU2013] 106 cor 13 14.1 -62 48           ~ 1 0
154 [HTU2013] 98 cor 13 14.2 -62 51           ~ 1 0
155 [HTU2013] 133 cor 13 14.2 -62 48           ~ 1 0
156 [HTU2013] 49 cor 13 14.3 -62 47           ~ 1 0
157 [HTU2013] 102 cor 13 14.3 -62 48           ~ 1 0
158 [HTU2013] 110 cor 13 14.3 -62 51           ~ 1 0
159 [HTU2013] G305.551+0.014 HII 13 14 20 -62 44.5           ~ 1 0
160 [HTU2013] 9 cor 13 14.4 -62 46           ~ 1 0
161 GAL 305.55-00.01 HII 13 14 21.5 -62 45 37           ~ 6 0
162 [HTU2013] 113 cor 13 14.4 -62 47           ~ 1 0
163 [HTU2013] 63 cor 13 14.4 -62 48           ~ 1 0
164 [HTU2013] 45 cor 13 14.4 -62 49           ~ 1 0
165 [HTU2013] 3 cor 13 14.4 -62 44           ~ 1 0
166 [HTU2013] 117 cor 13 14.4 -62 51           ~ 1 0
167 [HTU2013] 129 cor 13 14.4 -62 51           ~ 1 0
168 [HTU2013] G305.561+0.013 HII 13 14 26 -62 44.5           ~ 3 0
169 [HTU2013] 149 cor 13 14.5 -62 43           ~ 1 0
170 [HTU2013] 96 cor 13 14.5 -62 51           ~ 1 0
171 [HTU2013] 99 cor 13 14.6 -62 42           ~ 1 0
172 [HTU2013] 91 cor 13 14.6 -62 46           ~ 1 0
173 [HTU2013] 143 cor 13 14.7 -62 50           ~ 1 0
174 [HTU2013] 92 cor 13 14.7 -62 45           ~ 1 0
175 [HTU2013] 57 cor 13 14.9 -62 44           ~ 1 0
176 [HTU2013] 130 cor 13 15.0 -62 45           ~ 1 0
177 [HTU2013] 131 cor 13 15.0 -62 47           ~ 1 0
178 [HTU2013] 128 cor 13 15.1 -62 45           ~ 1 0
179 [HTU2013] 144 cor 13 15.2 -62 45           ~ 1 0
180 [HTU2013] 84 cor 13 15.2 -62 46           ~ 1 0
181 [HTU2013] 153 cor 13 15.3 -62 43           ~ 1 0
182 [HTU2013] 107 cor 13 15.4 -62 46           ~ 1 0
183 [HTU2013] 93 cor 13 15.7 -62 46           ~ 1 0
184 [HTU2013] 105 cor 13 15.8 -62 46           ~ 1 0
185 [HTU2013] 73 cor 13 16.0 -62 47           ~ 1 0
186 [HTU2013] 42 cor 13 16.3 -62 49           ~ 1 0
187 [HTU2013] 43 cor 13 16.5 -62 49           ~ 1 0
188 [HTU2013] 94 cor 13 16.5 -62 51           ~ 1 0
189 [HTU2013] 140 cor 13 16.6 -62 53           ~ 1 0
190 [HTU2013] 156 cor 13 16.6 -62 50           ~ 1 0
191 [HTU2013] 154 cor 13 16.6 -62 52           ~ 1 0
192 [HTU2013] 70 cor 13 16.6 -62 47           ~ 1 0
193 [HTU2013] 17 cor 13 16.7 -62 47           ~ 1 0
194 [HTU2013] 44 cor 13 16.8 -62 50           ~ 1 0
195 [HTU2013] 75 cor 13 16.8 -62 52           ~ 1 0
196 [HTU2013] 22 cor 13 17.0 -62 48           ~ 1 0
197 [HTU2013] 95 cor 13 17.1 -62 49           ~ 1 0
198 [HTU2013] 40 cor 13 17.1 -62 49           ~ 1 0
199 [HTU2013] 86 cor 13 17.2 -62 52           ~ 1 0
200 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
201 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 792 0
202 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1700 0
203 W 43 SFR 18 47 32 -01 56.5           ~ 604 0
204 NAME W 51 GMC MoC 19 23 +14.6           ~ 26 0
205 ICRF J193925.0-634245 Sy2 19 39 25.0245304992 -63 42 45.640373400   18.87 18.37 17.64   ~ 1332 2

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