2017A&A...602A..37K


Query : 2017A&A...602A..37K

2017A&A...602A..37K - Astronomy and Astrophysics, volume 602A, 37-37 (2017/6-1)

ATLASGAL-selected massive clumps in the inner Galaxy. IV. Millimeter hydrogen recombination lines from associated H II regions.

KIM W.-J., WYROWSKI F., URQUHART J.S., MENTEN K.M. and CSENGERI T.

Abstract (from CDS):

Aims. Observations of millimeter wavelength radio recombination lines (mm-RRLs) are used to search for HII regions in an unbiased way that is complementary to many of the more traditional methods previously used (e.g., radio continuum, far-infrared colors, maser emission). The mm-RRLs can be used to derive physical properties of HII regions and to provide velocity information of ionized gas.
Methods. We carried out targeted mm-RRL observations (39 ≤ principal quantum number (n)≤65 and Δn = 1, 2, 3, and 4, named Hnα, Hnβ, Hnγ, and Hnδ) using the IRAM 30 m and Mopra 22 m telescopes. In total, we observed 976 compact dust clumps selected from a catalog of ∼10000 sources identified by the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL). The sample was selected to ensure a representative mix of star-forming and quiescent clumps such that a variety of different evolutionary stages is represented. Approximately half of the clumps are mid-infrared quiet while the other half are mid-infrared bright.
Results. We detected Hnα mm-RRL emission toward 178 clumps; Hnβ, Hnγ, and Hnδ were also detected toward 65, 23, and 22 clumps, respectively. This is the largest sample of mm-RRLs detections published to date. Comparing the positions of these clumps with radio continuum surveys we identified compact radio counterparts for 134 clumps, confirming their association with known HII regions. The nature of the other 44 detections is unclear, but 8 detections are thought to be potentially new HII regions while the mm-RRL emission from the others may be due to contamination from nearby evolved HII regions. Broad linewidths are seen toward nine clumps (linewidth>40km/s) revealing significant turbulent motions within the ionized gas; in the past, such wide linewidths were found toward very compact and dense HII regions. We find that the systemic velocity of the associated dense molecular gas, traced by H13CO+(1-0), is consistent with the mm-RRL velocities and confirms them as embedded HII regions. We also find that the linewidth of the H13CO+(1-0) emission is significantly wider than those without mm-RRL detection, indicating a physical connection between the embedded HII region and their natal environments. We also find a correlation between the integrated fluxes of the mm-RRLs and the 6cm continuum flux densities of their radio counterparts (the correlation coefficient, ρ, is 0.70). By calculating the electron densities we find that the mm-RRL emission is associated with HII regions with ne<105cm–3 and HII region diameter >0.03pc.
Conclusions. We detected mm-RRLs toward 178 clumps and identified eight new HII region candidates. The broad mm-RRL from nine clumps may indicate that they arise in very young hyper-compact HII regions. The mm-RRLs trace the radio continuum sources detected by high-resolution observations and their line parameters show associations with the embedded radio sources and their parental molecular clumps.

Abstract Copyright: © ESO, 2017

Journal keyword(s): surveys - stars: massive - stars: formation - H II regions - ISM: general - ISM: general

VizieR on-line data: <Available at CDS (J/A+A/602/A37): table3.dat table2_1.dat table2_2.dat table2_3.dat table2_4.dat table6.dat img/*>

CDS comments: Paragraph 3.5 G34 not identified.

Simbad objects: 186

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Number of rows : 186
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 711 2
2 OH 301.14 -0.23 cor 12 35 35.14 -63 02 32.6           ~ 39 0
3 AGAL G301.116+00.959 smm 12 36 02 -61 51.5           ~ 8 0
4 AGAL G301.116+00.977 smm 12 36 02 -61 50.4           ~ 7 0
5 AGAL G305.201+00.227 Y*O 13 11 09 -62 33.5           ~ 8 0
6 AGAL G305.196+00.034 smm 13 11 14 -62 45.0           ~ 12 0
7 Caswell CH3OH 305.25+00.25 Mas 13 11 32.47 -62 32 09.1           ~ 14 0
8 [DBS2003] 131 OpC 13 11 39.400 -62 33 11.55           ~ 15 0
9 AGAL G305.272+00.296 Y*O 13 11 43 -62 29.0           ~ 10 0
10 AGAL G305.271-00.009 smm 13 11 55 -62 47.3           ~ 12 0
11 AGAL G305.357+00.202 Y*O 13 12 31 -62 34.2           ~ 10 0
12 AGAL G305.367+00.212 smm 13 12 36 -62 33.6           ~ 11 0
13 MMB G305.366+00.184 Mas 13 12 36.74 -62 35 14.7           ~ 12 0
14 AGAL G305.512+00.349 Y*O 13 13 45 -62 24.7           ~ 8 0
15 AGAL G311.899+00.084 smm 14 07 35 -61 27.3           ~ 11 0
16 AGAL G312.108+00.309 smm 14 08 42 -61 10.7           ~ 13 0
17 AGAL G316.768-00.026 Y*O 14 45 00.500 -59 48 44.00           ~ 11 0
18 AGAL G316.786-00.037 Y*O 14 45 12 -59 48.8           ~ 9 0
19 AGAL G316.799-00.056 Y*O 14 45 21 -59 49.5           ~ 8 0
20 MMB G316.811-00.057 Mas 14 45 26.43 -59 49 16.3           ~ 18 0
21 AGAL G318.914-00.164 smm 15 00 34 -58 58.1           ~ 11 0
22 AGAL G320.319-00.176 Y*O 15 10 02 -58 17.4           ~ 9 0
23 AGAL G321.719+01.176 smm 15 13 49 -56 24.7           ~ 12 0
24 OH 322.16 +0.63 Mas 15 18 34.64 -56 38 25.3           ~ 32 0
25 AGAL G322.164+00.622 Y*O 15 18 40 -56 39.0           ~ 11 0
26 OH 323.459 -0.079 Mas 15 29 19.33 -56 31 22.8           ~ 29 0
27 AGAL G324.201+00.121 smm 15 32 53 -55 56.1           ~ 13 0
28 MMB G324.923-00.568 Mas 15 39 57.64 -56 04 08.3           ~ 13 0
29 AGAL G326.446+00.907 Y*O 15 42 17 -53 58.5           ~ 11 0
30 AGAL G326.624+00.584 Y*O 15 44 35 -54 07.4           ~ 3 0
31 AGAL G326.657+00.594 smm 15 44 43 -54 05.8           ~ 13 0
32 AGAL G326.472-00.377 smm 15 47 50 -54 58.5           ~ 11 0
33 AGAL G327.266-00.541 Y*O 15 52 50 -54 36.4           ~ 10 0
34 AGAL G327.301-00.552 Y*O 15 53 04 -54 35.5           ~ 14 0
35 OH 327.3 -0.6 cor 15 53 07.65 -54 37 06.1           ~ 49 1
36 AGAL G328.308+00.431 smm 15 54 07 -53 11.6           ~ 13 0
37 AGAL G327.764-00.347 cor 15 54 38 -54 08.4           ~ 10 0
38 AGAL G328.809+00.632 cor 15 55 49 -52 43.1           ~ 23 0
39 AGAL G328.566-00.534 smm 15 59 37 -53 45.9           ~ 12 0
40 AGAL G330.294-00.394 smm 16 07 38 -52 31.0           ~ 14 0
41 AGAL G330.678-00.404 Y*O 16 09 32 -52 15.9           ~ 9 0
42 MMB G330.953-00.182 cor 16 09 52.37 -51 54 57.6           ~ 31 0
43 OH 330.9 -0.3 cor 16 10 19.80 -52 06 07.9           ~ 32 0
44 OH 331.13 -0.24 Mas 16 10 59.76 -51 50 22.6           ~ 30 0
45 MMB G331.278-00.188 cor 16 11 26.59 -51 41 56.7           ~ 37 0
46 AGAL G331.521-00.081 Y*O 16 12 07 -51 27.3           ~ 10 0
47 AGAL G331.512-00.102 smm 16 12 10 -51 28.6           ~ 13 0
48 AGAL G331.546-00.067 cor 16 12 10 -51 25.7           ~ 16 0
49 AGAL G331.136-00.524 smm 16 12 15 -52 02.5           ~ 12 0
50 AGAL G332.976+00.767 smm 16 15 06 -49 50.5           ~ 13 0
51 AGAL G332.156-00.449 cor 16 16 41 -51 17.0           ~ 13 0
52 AGAL G332.647-00.609 cor 16 19 39 -51 03.3           ~ 15 0
53 MMB G332.826-00.549 cor 16 20 10.85 -50 53 14.2           ~ 32 0
54 AGAL G333.018-00.449 Y*O 16 20 36 -50 40.9           ~ 12 0
55 AGAL G333.013-00.466 Y*O 16 20 39 -50 41.8           ~ 11 0
56 MMB G333.135-00.431 cor 16 21 02.82 -50 35 12.0           ~ 28 0
57 AGAL G333.219-00.402 smm 16 21 17 -50 30.4           ~ 11 0
58 OH 333.47 -0.16 cor 16 21 20.18 -50 09 48.6           ~ 24 0
59 AGAL G333.299-00.351 smm 16 21 25 -50 24.8           ~ 11 0
60 [LCU2014] G333.286-00.387 cor 16 21 30.3 -50 26 48           ~ 24 0
61 AGAL G333.308-00.366 Y*O 16 21 32 -50 25.1           ~ 14 0
62 AGAL G333.604-00.212 cor 16 22 09.35 -50 05 58.8           ~ 28 0
63 MSX6C G336.3684-00.0033 cor 16 32 56.448 -47 57 48.96           ~ 17 0
64 MMB G336.358-00.137 Mas 16 33 29.17 -48 03 43.9           ~ 20 0
65 MMB G336.822+00.028 Mas 16 34 38.28 -47 36 32.2           ~ 17 0
66 AGAL G337.121-00.174 smm 16 36 43 -47 31.5           ~ 12 0
67 AGAL G337.666-00.177 smm 16 38 53 -47 07.3           ~ 11 0
68 AGAL G338.074+00.011 smm 16 39 39 -46 41.5           ~ 14 0
69 AGAL G338.332+00.131 smm 16 40 08 -46 25.2           ~ 12 0
70 MMB G338.388+00.162 Mas 16 40 12.37 -46 21 25.6           ~ 14 0
71 AGAL G338.434+00.012 smm 16 41 02 -46 25.3           ~ 10 0
72 Caswell CH3OH 337.92-00.46 cor 16 41 06.05 -47 07 02.5           ~ 31 0
73 AGAL G337.916-00.477 cor 16 41 10.6 -47 08 03           ~ 31 0
74 AGAL G338.569-00.144 smm 16 42 14 -46 25.4           ~ 12 0
75 AGAL G342.058+00.421 smm 16 52 33 -43 23.8           ~ 12 0
76 AGAL G340.784-01.016 smm 16 54 16 -45 17.5           ~ 13 0
77 AGAL G344.424+00.046 smm 17 02 09 -41 46.8           ~ 16 0
78 AGAL G344.221-00.594 smm 17 04 13 -42 19.9           ~ 13 0
79 MMB G345.487+00.314 cor 17 04 28.24 -40 46 28.7           ~ 28 0
80 AGAL G345.649+00.009 smm 17 06 16 -40 49.8           ~ 13 0
81 MMB G345.407-00.952 Mas 17 09 35.42 -41 35 57.1           ~ 24 0
82 MMB G347.583+00.213 cor 17 11 26.72 -39 09 22.5           ~ 20 0
83 MMB G347.863+00.019 cor 17 13 06.23 -39 02 40.0           ~ 18 0
84 AGAL G347.967-00.432 cor 17 15 18 -39 13.4           ~ 12 0
85 AGAL G350.507+00.959 cor 17 17 00.41 -36 20 50.2           ~ 15 0
86 MMB G350.015+00.433 cor 17 17 45.45 -37 03 11.9           ~ 14 0
87 AGAL G348.228-00.962 Y*O 17 18 19 -39 19.1           ~ 10 0
88 AGAL G348.234-00.980 Y*O 17 18 25 -39 19.4           ~ 11 0
89 MMB G350.116+00.084 cor 17 19 28.83 -37 10 18.8           ~ 16 0
90 AGAL G350.121+00.059 smm 17 19 36 -37 10.9           ~ 10 0
91 AGAL G350.179+00.014 Y*O 17 19 57 -37 09.6           ~ 8 0
92 Caswell CH3OH 351.16+00.70 cor 17 19 57.50 -35 57 52.8           ~ 29 0
93 AGAL G348.698-01.027 smm 17 19 59 -38 58.2           ~ 14 0
94 AGAL G351.244+00.669 cor 17 20 17.84 -35 54 46.0           ~ 31 0
95 AGAL G351.416+00.646 cor 17 20 53 -35 47.0           ~ 26 0
96 AGAL G349.836-00.527 smm 17 21 12 -37 45.0           ~ 10 0
97 AGAL G350.782-00.026 Y*O 17 21 50 -36 41.3           ~ 9 0
98 AGAL G351.556+00.206 Y*O 17 23 04 -35 55.1           ~ 10 0
99 MMB G351.611+00.172 Mas 17 23 21.25 -35 53 32.6           ~ 12 0
100 AGAL G351.613+00.164 Y*O 17 23 24 -35 53.7           ~ 9 0
101 AGAL G353.189+00.899 cor 17 24 46.200 -34 10 48.51           ~ 10 0
102 AGAL G353.204+00.889 Y*O 17 24 51 -34 10.3           ~ 9 0
103 AGAL G353.187+00.839 Y*O 17 24 59.930 -34 12 48.25           ~ 11 0
104 MMB G351.581-00.353 cor 17 25 24.9262 -36 12 42.383           ~ 35 0
105 MMB G353.273+00.641 cor 17 26 01.58 -34 15 15.4           ~ 15 0
106 AGAL G352.316-00.442 cor 17 27 49 -35 39.2           ~ 13 0
107 MMB G352.855-00.201 cor 17 28 17.59 -35 04 12.9           ~ 14 0
108 OH 353.41 -0.36 cor 17 30 26.18 -34 41 45.6           ~ 83 0
109 MMB G008.669-00.356 HII 18 06 18.99 -21 37 32.2           ~ 27 0
110 MMB G010.472+00.027 cor 18 08 38.2290 -19 51 50.262           ~ 65 1
111 [WBH98] 18060-2005B Y*? 18 09 01.4549 -20 05 07.854           ~ 23 0
112 JCMTSE J180921.2-201932 HII 18 09 22 -20 19.5           ~ 14 0
113 AGAL G010.168-00.362 Y*O 18 09 27 -20 19.2           ~ 11 0
114 MMB G010.958+00.022 Mas 18 09 39.32 -19 26 28.0           ~ 18 0
115 MMB G011.034+00.062 cor 18 09 39.84 -19 21 20.3           ~ 24 0
116 W 31 SFR 18 10 28.6 -19 55 51           ~ 252 0
117 MMB G010.627-00.384 cor 18 10 29.22 -19 55 41.1           ~ 46 1
118 IRAS 18097-1825A cor 18 12 40 -18 24.4           ~ 61 0
119 MMB G011.936-00.616 Mas 18 14 00.89 -18 53 26.6           ~ 21 0
120 AGAL G012.804-00.199 cor 18 14 13.34 -17 55 45.3           ~ 27 0
121 SNR G012.8-00.2 SFR 18 14 14.0 -17 55 50           ~ 242 0
122 AGAL G013.384+00.064 smm 18 14 25 -17 17.6           ~ 9 0
123 AGAL G013.872+00.281 cor 18 14 35.81 -16 45 37.2           ~ 36 0
124 AGAL G013.209-00.144 cor 18 14 50 -17 32.8           ~ 17 0
125 AGAL G016.951+00.779 smm 18 18 51 -13 49.0           ~ 7 0
126 AGAL G015.056-00.624 Y*O 18 20 16 -16 08.9           ~ 7 0
127 AGAL G015.024-00.654 Y*O 18 20 19 -16 11.3           ~ 11 0
128 AGAL G015.051-00.642 Y*O 18 20 20 -16 09.5           ~ 8 0
129 AGAL G015.013-00.671 smm 18 20 21 -16 12.5           ~ 8 0
130 AGAL G015.030-00.669 cor 18 20 23 -16 11.4           ~ 23 0
131 NAME M 17 SW SFR 18 20 23.1 -16 11 43           ~ 265 0
132 AGAL G015.193-00.627 HII 18 20 32.8 -16 01 43           ~ 11 0
133 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1574 0
134 AGAL G016.942-00.072 smm 18 21 56 -14 13.6           ~ 9 0
135 OH 18.461 -0.003 Mas 18 24 36.34 -12 51 08.6           ~ 14 0
136 AGAL G018.301-00.389 smm 18 25 42 -13 10.5           ~ 10 0
137 GPSR5 19.075-0.287 HII 18 26 49 -12 26.4           ~ 12 1
138 AGAL G024.796+00.101 smm 18 36 09 -07 11.4           ~ 7 0
139 RRF 159 cor 18 36 12.4 -07 12 14           ~ 40 0
140 AGAL G024.673-00.151 smm 18 36 49.9 -07 24 50           ~ 8 0
141 AGAL G028.199-00.049 cor 18 42 58 -04 14.0           ~ 40 0
142 NAME G29.96-0.02 HMPO cor 18 46 04 -02 39.4           ~ 38 0
143 AGAL G029.911-00.042 cor 18 46 05 -02 42.4           ~ 26 0
144 AGAL G030.866+00.114 cor 18 47 16 -01 47.2           ~ 26 0
145 AGAL G030.588-00.042 cor 18 47 18.8 -02 06 18           ~ 27 0
146 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 499 0
147 IRAS 18449-0115 cor 18 47 34.29 -01 12 44.5           ~ 366 0
148 AGAL G030.683-00.074 smm 18 47 35.8 -02 02 09           ~ 10 0
149 AGAL G030.703-00.067 cor 18 47 36.6 -02 00 54           ~ 56 0
150 AGAL G030.753-00.051 smm 18 47 38.3 -01 57 44           ~ 23 0
151 AGAL G030.718-00.082 cor 18 47 42 -02 00.4           ~ 22 0
152 AGAL G030.818-00.056 cor 18 47 47.0 -01 54 28           ~ 147 0
153 AGAL G031.281+00.062 cor 18 48 13 -01 26.5           ~ 53 0
154 AGAL G031.243-00.111 cor 18 48 45 -01 33.2           ~ 19 0
155 AGAL G032.149+00.134 cor 18 49 32 -00 38.1           ~ 23 0
156 AGAL G031.396-00.257 cor 18 49 33 -01 29.0           ~ 32 0
157 AGAL G032.797+00.191 smm 18 50 31 -00 02.0           ~ 10 0
158 AGAL G032.744-00.076 cor 18 51 22 -00 12.1           ~ 22 0
159 AGAL G033.133-00.092 cor 18 52 08 +00 08.2           ~ 26 0
160 [THW2006] G033.92+00.11 cor 18 52 50.8487 +00 55 23.777           ~ 25 0
161 [CUS2014] G034.2572+0.1535 cor 18 53 18.6449 +01 15 01.574           ~ 35 0
162 AGAL G034.243+00.132 smm 18 53 22 +01 13.6           ~ 6 0
163 AGAL G035.466+00.141 smm 18 55 34 +02 19.1           ~ 10 0
164 AGAL G035.579-00.031 cor 18 56 22.6865 +02 20 19.057           ~ 31 0
165 AGAL G037.874-00.399 smm 19 01 54 +04 12.9           ~ 10 0
166 AGAL G043.148+00.014 Mas 19 10 11.04 +09 05 20.2           ~ 19 0
167 BGPS G043.169+00.009 cor 19 10 14.2145 +09 06 17.697           ~ 27 0
168 AGAL G043.178-00.011 smm 19 10 19 +09 06.2           ~ 8 0
169 W 49 SFR 19 10 20 +09 07.7           ~ 555 1
170 AGAL G043.164-00.029 MoC 19 10 22 +09 05.0           ~ 12 0
171 AGAL G043.236-00.047 smm 19 10 34 +09 08.3           ~ 10 0
172 AGAL G043.794-00.127 cor 19 11 54.00 +09 35 52.0           ~ 34 0
173 AGAL G043.179-00.519 smm 19 12 09 +08 52.2           ~ 6 0
174 JCMTSE J191322.1+105049 cor 19 13 21.6198 +10 50 48.641           ~ 20 0
175 AGAL G045.121+00.131 smm 19 13 28 +10 53.5           ~ 10 0
176 Caswell OH 045.47+00.13 Mas 19 14 07 +11 12.3           ~ 28 0
177 [ERG2015] 6741 cor 19 14 20.7768 +11 09 12.909           ~ 24 0
178 AGAL G045.466+00.046 cor 19 14 25.69 +11 09 25.2           ~ 31 0
179 AGAL G043.889-00.786 smm 19 14 27 +09 22.5           ~ 7 0
180 AGAL G048.606+00.022 smm 19 20 31 +13 55.4           ~ 8 0
181 AGAL G048.991-00.299 smm 19 22 26 +14 06.7           ~ 11 0
182 AGAL G049.214-00.342 Y*O 19 23 01.2831 +14 17 06.445           ~ 15 0
183 AGAL G049.369-00.301 smm 19 23 11 +14 26.6           ~ 10 0
184 AGAL G049.489-00.389 cor 19 23 44.15 +14 30 29.5           ~ 17 0
185 W 51 SNR 19 23 50 +14 06.0           ~ 1242 1
186 EM* MWC 349A * 20 32 45.5291969760 +40 39 36.651807828           ~ 158 0

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2023.01.31-09:01:23

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