2004A&A...417..115W

Query : 2004A&A...417..115W

2004A&A...417..115W - Astronomy and Astrophysics, volume 417115-133 (2004/4-1)

The circumstellar environments of high-mass protostellar objects. I. Submillimetre continuum emission.

WILLIAMS S.J., FULLER G.A. and SRIDHARAN T.K.

Abstract (from CDS):

We present maps of the 850µm and 450µm continuum emission seen towards a sample of 68 high-mass protostellar candidates with luminosities ranging from 102.5L☉ to ∼105L☉. Most of these candidate high-mass stars are in the earliest stages of evolution, and have not yet developed an ultra-compact HII region. We observe a variety of continuum emission morphologies, from compact symmetric sources through to multiple cores embedded in long filaments of emission. We find on average there is a 65% probability of an IRAS point-source having a companion detection at submillimetre wavelengths. The ratio of integrated flux to peak flux for our detections shows no strong dependence on distance, suggesting the emission we have observed is primarily from scale-free envelopes with power-law density structures. Assuming a near kinematic distance projection, the clumps we detect vary in mass from ∼1M☉ to over 1000M☉, with a mean clump mass of 330M☉, column density of 9x1023cm–2 and diameter of ∼0.6pc. The high luminosity and low mass of the smallest clumps suggests they are accompanied by a minimal number of stellar companions, while the most massive clumps may be examples of young protogroups and protoclusters. We measure the spectral index of the dust emission (α) and the spectral index of the dust grain opacity (β) towards each object, finding clumps with morphologies suggestive of strong temperature gradients, and of grain growth in their dense inner regions. We find a mean value for β of 0.9, significantly smaller than observed towards UCHII regions.

Abstract Copyright: ∼

Journal keyword(s): stars: formation - stars: circumstellar matter - ISM: clouds - ISM: dust, extinction

VizieR on-line data: <Available at CDS (J/A+A/417/115): table2.dat>

Nomenclature: Table 2: WFS NNN (Nos 1-112).

Simbad objects: 114

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Number of rows : 114
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 WFS 1 smm 05 39 10.8 +35 45 16           ~ 2 0
2 WFS 2 smm 05 39 12.7 +35 45 51           ~ 2 0
3 WFS 3 smm 05 52 11.0 +27 00 34           ~ 3 0
4 WFS 5 smm 05 52 12.1 +26 59 38           ~ 2 0
5 WFS 4 smm 05 52 12.1 +27 00 11           ~ 3 0
6 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 145 1
7 WFS 7 smm 18 11 45.2 -17 30 43           ~ 2 0
8 AGAL G012.888+00.489 cor 18 11 51.52 -17 31 28.9           ~ 45 0
9 AGAL G012.916+00.492 Y*O 18 11 54.00 -17 29 59.0           ~ 27 0
10 WFS 10 smm 18 11 56.4 -17 30 07           ~ 1 0
11 WFS 11 smm 18 11 57.0 -17 29 34           ~ 2 0
12 OH 012.03-00.04 Y*O 18 12 01.8400 -18 31 55.800           ~ 91 0
13 IRAS 18102-1800 HII 18 13 12.2 -17 59 35           ~ 24 0
14 IRAS 18151-1208 Y*O 18 17 58.1254 -12 07 24.893           ~ 114 0
15 IRAS 18159-1550 HII 18 18 47.30 -15 48 57.9           ~ 27 0
16 EGO G016.59-0.05 HII 18 21 07.9 -14 31 53           ~ 129 0
17 OH 016.59-00.05 Mas 18 21 09.0840 -14 31 48.556           ~ 85 0
18 BGPSv2 G018.655-00.060 cor 18 25 10.53 -12 42 25.8           ~ 10 0
19 MMB G019.755-00.128 Y*O 18 27 31.602 -11 45 55.17           ~ 54 0
20 MMB G019.884-00.534 cor 18 29 14.37 -11 50 23.0           ~ 119 1
21 WFS 20 smm 18 30 02.2 -12 15 40           ~ 2 0
22 AGAL G019.606-00.901 cor 18 30 02.810 -12 15 17.70           ~ 16 0
23 WFS 22 smm 18 31 43.4 -09 22 26           ~ 8 0
24 BGPSv2 G022.353+00.067 cor 18 31 43.93 -09 22 13.3           ~ 8 0
25 AGAL G023.252+00.104 Y*O 18 33 17.3 -08 33 28           ~ 17 0
26 AGAL G023.264+00.077 cor 18 33 24.00 -08 33 31.0           ~ 43 0
27 WFS 26 smm 18 33 29.8 -08 38 33           ~ 1 0
28 BGPS G023.202-00.000 cor 18 33 32.9 -08 39 09           ~ 13 0
29 IRAS 18310-0825 HII 18 33 47.9 -08 23 52           ~ 33 0
30 RAFGL 5515 HII 18 36 29.0 -07 40 33           ~ 35 0
31 AGAL G025.409+00.106 cor 18 37 16 -06 38.6           ~ 57 0
32 WFS 31 smm 18 37 26.4 -06 13 40           ~ 1 0
33 WFS 32 smm 18 37 27.5 -06 14 05           ~ 1 0
34 IRAS 18348-0616 Y*O 18 37 30.420 -06 14 14.49   17.34 16.14 14.80   ~ 41 0
35 GAL 026.60-00.02 HII 18 39 55.9 -05 38 45           ~ 34 1
36 AGAL G027.184-00.081 cor 18 41 13.26 -05 08 57.9           ~ 60 0
37 AGAL G030.423+00.466 cor 18 45 12.8 -02 01 12           ~ 34 0
38 IRAS 18431-0312 HII 18 45 45.5 -03 09 21           ~ 21 0
39 WFS 38 smm 18 46 21.8 -02 12 20           ~ 2 0
40 WFS 39 smm 18 46 22.4 -02 14 16           ~ 2 0
41 WFS 40 smm 18 46 23.0 -02 15 16           ~ 1 0
42 WFS 41 smm 18 46 33.3 -01 44 52           ~ 2 0
43 IRAS 18440-0148 cor 18 46 36.56 -01 45 21.2           ~ 65 0
44 IRAS 18445-0222 HII 18 47 10.6 -02 19 08           ~ 31 0
45 WFS 44 smm 18 47 20.2 -02 25 28           ~ 1 0
46 WFS 45 smm 18 47 21.5 -02 26 11           ~ 1 0
47 WFS 46 smm 18 47 23.5 -02 26 16           ~ 1 0
48 WFS 47 smm 18 47 26.1 -02 26 57           ~ 1 0
49 AGAL G030.784-00.021 Y*O 18 47 35.6 -01 55 16           ~ 28 0
50 WFS 49 smm 18 47 38.7 -01 55 10           ~ 1 0
51 AGAL G031.158+00.047 cor 18 48 02.46 -01 33 26.5           ~ 45 0
52 WFS 51 smm 18 48 37.8 -03 03 48           ~ 2 0
53 WFS 52 smm 18 48 39.7 -03 04 07           ~ 1 0
54 WFS 53 smm 18 48 40.4 -03 03 57           ~ 1 0
55 BGPSv2 G032.119+00.092 cor 18 49 37.81 -00 41 01.1           ~ 33 0
56 AGAL G032.471+00.204 cor 18 49 53 -00 19.0           ~ 22 0
57 WFS 56 smm 18 49 53.8 -00 19 48           ~ 1 0
58 WFS 57 smm 18 51 24.4 +00 04 39           ~ 2 0
59 AGAL G032.990+00.034 cor 18 51 25.55616 +00 04 07.1292           ~ 24 0
60 WFS 59 smm 18 54 40.6 +01 38 05           ~ 4 0
61 WFS 60 smm 18 54 44.4 +01 37 00           ~ 2 0
62 IRAS 18530+0215 cor 18 55 33.7 +02 19 09           ~ 43 0
63 WFS 62 smm 18 56 36.6 +02 24 45           ~ 2 0
64 WFS 63 smm 18 56 40.1 +02 25 30           ~ 2 0
65 IRAS 18553+0414 cor 18 57 53.37 +04 18 15.7           ~ 36 0
66 IRAS 18566+0408 Y*O 18 59 09.95520 +04 12 15.6240           ~ 143 0
67 AGAL G039.388-00.141 cor 19 03 45 +05 40.7           ~ 58 1
68 IRAS 19035+0641 Y*O 19 06 01.6288 +06 46 36.140           ~ 84 0
69 WFS 68 smm 19 09 53.4 +07 57 12           ~ 2 0
70 WFS 69 smm 19 09 53.9 +07 56 55           ~ 2 0
71 WFS 70 smm 19 19 48.6 +14 02 26           ~ 3 1
72 WFS 71 smm 19 19 48.8 +14 02 46           ~ 3 1
73 AGAL G051.678+00.719 cor 19 23 59 +16 57.7           ~ 48 0
74 AGAL G049.669-00.457 Y*O 19 24 20 +14 38.0           ~ 42 0
75 AGAL G053.037+00.112 cor 19 28 55.5 +17 52 00           ~ 50 0
76 BGPS G053.616+00.036 cor 19 30 23.1 +18 20 22           ~ 12 0
77 AGAL G053.632+00.014 Y*O 19 30 29.542 +18 20 31.74           ~ 11 0
78 NGC 6820 GNe 19 42 27.930 +23 05 14.75       14.56   ~ 50 0
79 WFS 78 smm 19 43 10.6 +23 45 02           ~ 2 0
80 MSX6C G059.7831+00.0648 Y*O 19 43 11.2464 +23 44 03.270           ~ 159 0
81 IRAS 19410+2336 SFR 19 43 11.5 +23 44 06           ~ 160 0
82 IRAS 19411+2306 cor 19 43 17.9613824400 +23 14 01.619818008           ~ 49 0
83 WFS 81 smm 19 43 26.3 +23 40 26           ~ 2 0
84 AGAL G059.762-00.026 cor 19 43 29.29 +23 40 17.5           ~ 17 0
85 WFS 83 smm 19 49 10.1 +26 49 10           ~ 2 0
86 WFS 84 smm 19 49 11.8 +26 49 38           ~ 2 0
87 IRAS 20051+3435 * 20 07 04.5 +34 44 45           ~ 31 0
88 WFS 86 smm 20 10 12.6 +27 29 13           ~ 2 0
89 WFS 87 smm 20 10 13.3 +27 28 21           ~ 2 0
90 WFS 88 smm 20 10 16.0 +27 28 12           ~ 2 0
91 WFS 89 smm 20 10 18.7 +27 27 18           ~ 2 0
92 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
93 WFS 91 smm 20 22 20.0 +39 58 21           ~ 2 0
94 WFS 92 smm 20 22 24.9 +39 57 55           ~ 2 0
95 CPM 35 cor 20 23 23.855 +41 17 40.49           ~ 58 0
96 IRAS 20293+3952 HII 20 31 11.040 +40 03 10.69           ~ 80 0
97 IRAS 20319+3958 HII 20 33 49.24632 +40 08 44.1924           ~ 45 1
98 WFS 96 smm 20 34 58.7 +41 34 46           ~ 2 0
99 WFS 97 smm 20 35 01.1 +41 34 59           ~ 2 0
100 WFS 98 smm 20 36 03.4 +41 39 44           ~ 2 0
101 WFS 99 smm 20 36 06.3 +41 39 59           ~ 2 0
102 WFS 100 smm 20 36 08.1 +41 39 58           ~ 2 0
103 IRAS 22134+5834 Y*O 22 15 09.08 +58 49 07.8           ~ 77 0
104 WFS 102 smm 22 57 04.3 +62 37 44           ~ 2 0
105 WFS 103 smm 22 57 07.4 +62 37 29           ~ 2 0
106 WFS 104 smm 22 57 11.6 +62 36 46           ~ 2 0
107 WFS 105 smm 22 58 55.3 +59 28 42           ~ 1 0
108 JCMTSE J225859.3+592738 cor 22 58 59.2 +59 27 41           ~ 7 0
109 WFS 107 smm 22 59 05.0 +59 28 23           ~ 2 0
110 IRAS 23033+5951 Y*O 23 05 25.1762883456 +60 08 15.374293800           ~ 97 0
111 IRAS 23139+5939 Y*O 23 16 10.3420 +59 55 28.596           ~ 100 0
112 IRAS 23151+5912 HII 23 17 21.0 +59 28 49           ~ 102 0
113 WFS 111 smm 23 57 02.1 +65 24 38           ~ 2 0
114 WFS 112 smm 23 57 06.4 +65 24 49           ~ 2 0

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