2018A&A...616A.107K


C.D.S. - SIMBAD4 rel 1.7 - 2020.07.08CEST04:26:57

2018A&A...616A.107K - Astronomy and Astrophysics, volume 616A, 107-107 (2018/8-1)

New detections of (sub)millimeter hydrogen radio recombination lines towards high-mass star-forming clumps.

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

Abstract (from CDS):


Aims. Previous radio recombination line (RRL) observations of dust clumps identified in the APEX Telescope Large Area Survey of the Galaxy (ATLASGAL) have led to the detection of a large number of RRLs in the 3 mm range. Here, we aim to study their excitation with shorter wavelength (sub)millimeter radio recombination line (submm-RRL) observations.
Methods. We made observations of submm-RRLs with low principal quantum numbers (n≤30) using the APEX 12m telescope, toward 104 HII regions associated with massive dust clumps from ATLASGAL. The observations covered the H25α, H28α, and H35β transitions. Toward a small subsample the H26α, H27α, H29α, and H30α lines were observed to avoid contamination by molecular lines at adjacent frequencies.
Results. We have detected submm-RRLs (signal-to-noise (S/N)≥3σ) from compact HII regions embedded within 93 clumps. The submm-RRLs are approximately a factor of two brighter than the mm-RRLs and consistent with optically thin emission in local thermodynamic equilibrium (LTE). The average ratio (0.31) of the measured H35β/H28α fluxes is close to the LTE value of 0.28. No indication of RRL maser emission has been found. The Lyman photon flux, bolometric, and submm-RRL luminosities toward the submm-RRL detected sources present significant correlations. The trends of dust temperature and the ratio of bolometric luminosity to clump mass, Lbol/Mclump, indicate that the HII regions are related to the most massive and luminous clumps. By estimating the production rate of ionizing photons, Q, from the submm-RRL flux, we find that the Q(H28α) measurements provide estimates of the Lyman continuum photon flux consistent with those determined from 5GHz radio continuum emission. Six RRL sources show line profiles that are a combination of a narrow and a broad Gaussian feature. The broad features are likely associated with high-velocity ionized flows.
Conclusions. We have detected submm-RRLs toward 93 ATLASGAL clumps. Six RRL sources have high-velocity RRL components likely driven by high-velocity ionized flows. Their observed properties are consistent with thermal emission that correlates well with the Lyman continuum flux of the HII regions. The sample of HII regions with mm/submm-RRL detections probes, in our Galaxy, luminous clumps (Lbol>104L) with high Lbol/Mclump. We also provide suitable candidates for further studies of the morphology and kinematics of embedded, compact HII regions with the Atacama Large Millimeter/submillimeter Array (ALMA).

Abstract Copyright: © ESO 2018

Journal keyword(s): surveys - stars: massive - stars: formation - HII regions - submillimeter: ISM

VizieR on-line data: <Available at CDS (J/A+A/616/A107): table4.dat table6.dat fig2sp/* fits/*>

Simbad objects: 113

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Number of rows : 113

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 AGAL G285.264-00.049 smm 10 31 30 -58 02.3           ~ 3 0
2 AGAL G289.881-00.797 smm 11 01 01 -60 50.4           ~ 4 0
3 AGAL G291.272-00.714 smm 11 11 51 -61 18.7           ~ 4 0
4 AGAL G298.224-00.339 smm 12 10 01 -62 49.9           ~ 5 0
5 AGAL G298.859-00.437 smm 12 15 24 -63 01.4           ~ 4 0
6 OH 301.14 -0.23 cor 12 35 35.14 -63 02 32.6           ~ 32 0
7 AGAL G301.116+00.959 smm 12 36 02 -61 51.5           ~ 7 0
8 AGAL G305.196+00.034 smm 13 11 14 -62 45.0           ~ 11 0
9 AGAL G305.272+00.296 Y*O 13 11 43 -62 29.0           ~ 9 0
10 AGAL G305.271-00.009 smm 13 11 55 -62 47.3           ~ 11 0
11 AGAL G305.357+00.202 Y*O 13 12 31 -62 34.2           ~ 9 0
12 AGAL G305.367+00.212 smm 13 12 36 -62 33.6           ~ 10 0
13 MMB G305.366+00.184 Mas 13 12 36.74 -62 35 14.7           ~ 11 0
14 NGC 5253 AGN 13 39 55.990 -31 38 24.11 11.48 10.94 10.49 10.33   ~ 1269 4
15 AGAL G311.899+00.084 smm 14 07 35 -61 27.3           ~ 10 0
16 AGAL G312.108+00.309 smm 14 08 42 -61 10.7           ~ 11 0
17 AGAL G316.786-00.037 Y*O 14 45 12 -59 48.8           ~ 8 0
18 AGAL G316.799-00.056 Y*O 14 45 21 -59 49.5           ~ 8 0
19 MMB G316.811-00.057 Mas 14 45 26.43 -59 49 16.3           ~ 17 0
20 AGAL G318.914-00.164 smm 15 00 34 -58 58.1           ~ 10 0
21 AGAL G320.319-00.176 Y*O 15 10 02 -58 17.4           ~ 8 0
22 AGAL G321.719+01.176 smm 15 13 49 -56 24.7           ~ 11 0
23 OH 322.16 +0.63 Mas 15 18 34.64 -56 38 25.3           ~ 31 0
24 AGAL G322.164+00.622 Y*O 15 18 40 -56 39.0           ~ 10 0
25 MMB G323.459-00.079 Mas 15 29 19.33 -56 31 22.8           ~ 27 0
26 AGAL G324.201+00.121 smm 15 32 53 -55 56.1           ~ 12 0
27 AGAL G326.446+00.907 Y*O 15 42 17 -53 58.5           ~ 10 0
28 AGAL G326.657+00.594 smm 15 44 43 -54 05.8           ~ 11 0
29 AGAL G327.301-00.552 Y*O 15 53 04 -54 35.5           ~ 11 0
30 OH 327.29 -0.58 cor 15 53 07.65 -54 37 06.1           ~ 41 0
31 AGAL G328.308+00.431 smm 15 54 07 -53 11.6           ~ 11 0
32 AGAL G328.809+00.632 cor 15 55 49 -52 43.1           ~ 18 0
33 AGAL G328.566-00.534 smm 15 59 37 -53 45.9           ~ 11 0
34 AGAL G330.294-00.394 smm 16 07 38 -52 31.0           ~ 13 0
35 MMB G330.953-00.182 cor 16 09 52.37 -51 54 57.6           ~ 25 0
36 MMB G330.878-00.367 cor 16 10 19.80 -52 06 07.9           ~ 23 0
37 AGAL G331.521-00.081 Y*O 16 12 07 -51 27.3           ~ 9 0
38 AGAL G331.546-00.067 cor 16 12 10 -51 25.7           ~ 15 0
39 AGAL G332.156-00.449 cor 16 16 41 -51 17.0           ~ 12 0
40 AGAL G332.647-00.609 cor 16 19 39 -51 03.3           ~ 14 0
41 MMB G332.826-00.549 cor 16 20 10.85 -50 53 14.2           ~ 26 0
42 AGAL G333.018-00.449 Y*O 16 20 36 -50 40.9           ~ 11 0
43 MMB G333.135-00.431 cor 16 21 02.82 -50 35 12.0           ~ 21 0
44 [LCU2014] G333.286-00.387 cor 16 21 30.3 -50 26 48           ~ 20 0
45 AGAL G333.308-00.366 Y*O 16 21 32 -50 25.1           ~ 12 0
46 AGAL G333.604-00.212 cor 16 22 09.35 -50 05 58.8           ~ 20 0
47 AGAL G337.121-00.174 smm 16 36 43 -47 31.5           ~ 11 0
48 AGAL G338.074+00.011 smm 16 39 39 -46 41.5           ~ 13 0
49 AGAL G338.332+00.131 smm 16 40 08 -46 25.2           ~ 11 0
50 AGAL G338.434+00.012 smm 16 41 02 -46 25.3           ~ 9 0
51 Caswell CH3OH 337.92-00.46 cor 16 41 06.05 -47 07 02.5           ~ 28 0
52 AGAL G340.784-01.016 smm 16 54 16 -45 17.5           ~ 12 0
53 AGAL G344.424+00.046 smm 17 02 09 -41 46.8           ~ 15 0
54 MMB G345.487+00.314 cor 17 04 28.24 -40 46 28.7           ~ 27 0
55 AGAL G345.649+00.009 smm 17 06 16 -40 49.8           ~ 12 0
56 MMB G345.407-00.952 Mas 17 09 35.42 -41 35 57.1           ~ 23 0
57 Caswell CH3OH 351.16+00.70 cor 17 19 57.50 -35 57 52.8           ~ 27 0
58 AGAL G348.698-01.027 smm 17 19 59 -38 58.2           ~ 14 0
59 [BE83] Maser 351.24+00.67 cor 17 20 17.84 -35 54 46.0           ~ 27 0
60 AGAL G351.416+00.646 cor 17 20 53 -35 47.0           ~ 20 0
61 AGAL G353.189+00.899 smm 17 24 46 -34 10.8           ~ 8 0
62 MMB G351.581-00.353 cor 17 25 24.9262 -36 12 42.383           ~ 30 0
63 MMB G353.410-00.360 cor 17 30 26.18 -34 41 45.6           ~ 75 1
64 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11535 0
65 MMB G010.472+00.027 cor 18 08 38.20 -19 51 50.1           ~ 39 0
66 JCMTSE J180921.2-201932 HII 18 09 21.2 -20 19 32           ~ 12 0
67 AGAL G010.168-00.362 Y*O 18 09 28 -20 19.1           ~ 7 0
68 MMB G010.627-00.384 cor 18 10 29.0046 -19 55 43.983           ~ 36 1
69 MMB G011.936-00.616 Mas 18 14 00.89 -18 53 26.6           ~ 19 0
70 AGAL G012.804-00.199 cor 18 14 13.34 -17 55 45.3           ~ 20 0
71 SNR G012.8-00.2 SFR 18 14 14.0 -17 55 50           ~ 218 0
72 [UFM2015] G013.873+00.280 cor 18 14 35.9501 -16 45 36.504           ~ 29 0
73 AGAL G013.209-00.144 smm 18 14 50 -17 32.8           ~ 13 0
74 AGAL G015.024-00.654 Y*O 18 20 18 -16 11.5           ~ 6 0
75 AGAL G015.051-00.642 Y*O 18 20 19.4 -16 09 37           ~ 6 0
76 MMB G015.034-00.677 cor 18 20 24.78 -16 11 34.6           ~ 17 0
77 AGAL G018.301-00.389 smm 18 25 42 -13 10.4           ~ 8 0
78 [THW2006] G028.200-00.051SMM cor 18 42 58.7995 -04 14 00.349           ~ 34 0
79 NAME G29.96-0.02 HMPO cor 18 46 04.2220 -02 39 25.516           ~ 35 0
80 AGAL G030.866+00.114 cor 18 47 15.6972 -01 47 04.670           ~ 22 0
81 SNR G030.8-00.0 SNR 18 47 32 -01 56.5           ~ 437 0
82 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 312 0
83 AGAL G030.753-00.051 smm 18 47 39 -01 57.7           ~ 9 0
84 [MSL2003] W43-MM1 cor 18 47 47.0 -01 54 28           ~ 95 0
85 AGAL G031.281+00.062 smm 18 48 12 -01 26.5           ~ 9 0
86 AGAL G031.243-00.111 smm 18 48 45 -01 33.2           ~ 8 0
87 AGAL G032.149+00.134 smm 18 49 32 -00 38.1           ~ 9 0
88 AGAL G032.797+00.191 smm 18 50 31 -00 02.0           ~ 9 0
89 AGAL G033.133-00.092 smm 18 52 08 +00 08.2           ~ 9 0
90 [THW2006] G033.92+00.11 cor 18 52 50.8487 +00 55 23.777           ~ 24 0
91 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 460 0
92 [CUS2014] G034.2572+0.1535 cor 18 53 18.6449 +01 15 01.574           ~ 30 0
93 AGAL G035.466+00.141 smm 18 55 34 +02 19.2           ~ 8 0
94 AGAL G035.579-00.031 cor 18 56 22.6865 +02 20 19.057           ~ 30 0
95 AGAL G037.874-00.399 smm 19 01 54 +04 12.9           ~ 9 0
96 AGAL G043.148+00.014 Mas 19 10 11.04 +09 05 20.2           ~ 15 0
97 BGPS G043.169+00.009 cor 19 10 14.2145 +09 06 17.697           ~ 24 0
98 W 49a SFR 19 10 15.7 +09 06 05           ~ 258 2
99 AGAL G043.178-00.011 smm 19 10 19 +09 06.2           ~ 7 0
100 W 49 SFR 19 10 20 +09 07.7           ~ 508 1
101 AGAL G043.164-00.029 smm 19 10 22 +09 05.0           ~ 9 0
102 AGAL G043.236-00.047 smm 19 10 34 +09 08.3           ~ 9 0
103 JCMTSE J191322.1+105049 cor 19 13 21.6198 +10 50 48.641           ~ 18 0
104 AGAL G045.121+00.131 smm 19 13 28 +10 53.5           ~ 9 0
105 Caswell OH 045.47+00.13 Mas 19 14 07 +11 12.3           ~ 25 0
106 [ERG2015] 6741 cor 19 14 20.7768 +11 09 12.909           ~ 21 0
107 AGAL G043.889-00.786 smm 19 14 27 +09 22.5           ~ 6 0
108 AGAL G048.991-00.299 smm 19 22 26 +14 06.7           ~ 10 0
109 AGAL G049.214-00.342 Y*O 19 23 01.2831 +14 17 06.445           ~ 14 0
110 AGAL G049.369-00.301 smm 19 23 11 +14 26.6           ~ 8 0
111 AGAL G049.489-00.389 cor 19 23 44.15 +14 30 29.5           ~ 13 0
112 EM* MWC 349 ** 20 32 45.499080 +40 39 36.74124   15.88 13.15 12.13   Bep 707 0
113 EM* MWC 349A * 20 32 45.5290328485 +40 39 36.647044678           ~ 145 0

    Equat.    Gal    SGal    Ecl

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2020.07.08-04:26:57

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