2006ApJS..166..567R

Query : 2006ApJS..166..567R

2006ApJS..166..567R - Astrophys. J., Suppl. Ser., 166, 567-584 (2006/October-0)

Molecular line observations of infrared dark clouds: seeking the precursors to intermediate and massive star formation.

RAGAN S.E., BERGIN E.A., PLUME R., GIBSON D.L., WILNER D.J., O'BRIEN S. and HAILS E.

Abstract (from CDS):

We have identified 41 infrared dark clouds from the 8 µm maps of the Midcourse Space Experiment (MSX), selected to be found within 1 deg2 areas centered on known ultracompact H II regions. We have mapped these infrared dark clouds in N2H+1⟶0, CS 2⟶1, and C18O 1⟶0 emission using the Five College Radio Astronomy Observatory. The maps of the different species often show striking differences in morphologies, indicating differences in evolutionary state and/or the presence of undetected, deeply embedded protostars. We derive an average mass for these clouds using N2H+ column densities of ~2500 M☉, a value comparable to that found in previous studies of high-mass star-forming cores using other mass tracers. The line widths of these clouds are typically ∼2.0-2.9 km/s. Based on the fact that they are dark at 8 µm, compact, and massive, and have large velocity dispersions, we suggest that these clouds may be the precursor sites of intermediate- and high-mass star formation.

Abstract Copyright: ∼

Journal keyword(s): ISM: Clouds - ISM: Molecules - Stars: Formation

VizieR on-line data: <Available at CDS (J/ApJS/166/567): regions.dat table1.dat table2.dat>

Nomenclature: Table 1: [RBP2006] GLL.ll+B.bb N=114.

Status at CDS : All or part of tables of objects could be ingested in SIMBAD with priority 2.

CDS comments: IRAS 18197-1812 is a misprint for IRAS 18107-1812.

Simbad objects: 74

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Number of rows : 74
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 [RBP2006] G05.85-0.23 MoC 17 59 49.500 -24 00 50.25           ~ 8 0
2 RAFGL 2046 HII 18 00 32.1 -24 04 03           ~ 380 0
3 [RBP2006] G06.26-0.51 MoC 18 01 46.570 -23 47 51.61           ~ 3 0
4 [RBP2006] G09.16+0.06 MoC 18 05 46.710 -20 59 51.77           ~ 3 0
5 RAFGL 5436 HII 18 06 19.027 -21 37 32.32           ~ 108 0
6 [RBP2006] G09.28-0.15 MoC 18 06 49.960 -20 59 31.46           ~ 5 0
7 IRAS 18038-2105 FIR 18 06 53.1 -21 04 38           ~ 3 0
8 [RBP2006] G09.21-0.22 MoC 18 06 56.030 -21 04 59.32           ~ 2 0
9 [RBP2006] G09.86-0.04 MoC 18 07 36.470 -20 26 05.34           ~ 5 0
10 [RBP2006] G09.88-0.11 MoC 18 07 55.690 -20 26 52.74           ~ 2 0
11 OH 009.88-00.13 OH* 18 07 59.06976 -20 27 33.5124           O-rich 12 0
12 MMB G010.299-00.146 Mas 18 08 55.54 -20 05 57.5           ~ 21 0
13 [WC89] 010.30-0.15B HII 18 08 55.95 -20 05 55.4           ~ 33 0
14 AGAL G010.299-00.147 smm 18 08 56.006 -20 05 52.76           ~ 58 0
15 GAL 010.30-00.15 HII 18 08 56.11 -20 05 53.8           ~ 85 0
16 GPSR 010.585-0.304 Rad 18 10 06.24 -19 55 33.1           ~ 2 0
17 [RBP2006] G10.99-0.09 MoC 18 10 07.180 -19 27 59.72           ~ 2 0
18 [RBP2006] G10.59-0.31 MoC 18 10 08.020 -19 55 34.98           ~ 2 0
19 [RBP2006] G10.70-0.33 MoC 18 10 25.440 -19 49 53.70           ~ 2 0
20 [RBP2006] G12.22+0.14 MoC 18 11 47.790 -18 16 51.43           ~ 2 0
21 IRAS 18107-1812 IR 18 13 39.0 -18 11 46           ~ 2 0
22 [RBP2006] G12.50-0.22 MoC 18 13 41.440 -18 12 32.16           ~ 3 0
23 CORNISH G011.9368-00.6158 HII 18 14 01.0 -18 53 23           ~ 88 1
24 [RBP2006] G14.33-0.57 MoC 18 18 37.670 -16 45 30.54           ~ 2 0
25 GAL 015.04-00.68 HII 18 20 24.81 -16 11 35.0           ~ 20 1
26 [RBP2006] G19.40-0.01 MoC 18 26 24.050 -12 01 33.28           ~ 2 0
27 Mol 55 Rad 18 26 24.3 -12 03 47           ~ 4 0
28 [RBP2006] G19.37-0.03 MoC 18 26 27.610 -12 03 30.32           ~ 2 0
29 [RBP2006] G19.28-0.39 MoC 18 27 33.680 -12 18 18.35           ~ 2 0
30 GAL 019.61-00.23 HII 18 27 38.0 -11 56 42           ~ 162 0
31 GAL 023.71+00.17 HII 18 33 53.54 -08 07 13.8           ~ 31 0
32 [RBP2006] G23.37-0.29 MoC 18 34 53.660 -08 38 08.59           ~ 5 0
33 [RBP2006] G24.16+0.08 MoC 18 35 03.290 -07 45 58.96           ~ 2 0
34 [RBP2006] G24.05-0.22 MoC 18 35 54.610 -07 59 48.07           ~ 8 0
35 [RBP2006] G23.48-0.53 MoC 18 35 59.520 -08 38 56.65           ~ 3 0
36 ISOGAL-P J183802.9-062347 Y*? 18 38 02.80 -06 23 47.0           ~ 32 0
37 [RBP2006] G25.99-0.06 MoC 18 38 55.260 -06 12 20.39           ~ 2 0
38 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 385 0
39 [RBP2006] G30.14-0.07 MoC 18 46 34.710 -02 31 13.90           ~ 2 0
40 [SVG93] 184438.2-014734 Mas 18 47 13.9 -01 44 14           ~ 3 0
41 [RBP2006] G30.89+0.14 MoC 18 47 14.080 -01 45 05.75           ~ 2 0
42 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 430 1
43 [RBP2006] G30.53-0.27 MoC 18 47 42.000 -02 25 08.99           ~ 2 0
44 [RBP2006] G31.02-0.12 MoC 18 48 22.170 -01 45 03.19           ~ 2 0
45 [RBP2006] G30.49-0.39 MoC 18 48 23.100 -02 20 54.35           ~ 2 0
46 [RBP2006] G30.98-0.15 MoC 18 48 23.970 -01 48 23.07           ~ 2 0
47 [RBP2006] G32.01+0.05 MoC 18 49 33.700 -00 47 32.25           ~ 2 0
48 IRAS 18470-0050 * 18 49 37.049 -00 46 49.86           ~ 9 0
49 GAL 033.50+00.20 HII 18 51 46.71 +00 35 32.3           ~ 24 0
50 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
51 [RBP2006] G33.82-0.22 MoC 18 53 50.100 +00 41 22.54           ~ 2 0
52 [RBP2006] G34.74-0.12 MoC 18 55 10.110 +01 33 09.25           ~ 7 0
53 IRAS 18526+0130 Y*O 18 55 12.4514028264 +01 34 03.625142700           ~ 6 0
54 [RBP2006] G34.78-0.80 MoC 18 57 40.080 +01 16 33.76           ~ 2 0
55 [RBP2006] G35.20-0.72 MoC 18 58 08.920 +01 41 31.31           ~ 2 0
56 [RBP2006] G34.63-1.03 MoC 18 58 10.950 +01 02 25.33           ~ 2 0
57 [RBP2006] G37.44+0.14 MoC 18 59 10.750 +04 04 24.37           ~ 3 0
58 GAL 037.55-00.11 HII 19 00 16.02 +04 03 15.1           ~ 41 0
59 [RBP2006] G37.89-0.15 MoC 19 01 02.000 +04 20 18.23           ~ 2 0
60 [WC89] 035.20-1.74 HII 19 01 46.4 +01 13 25           ~ 12 0
61 [RBP2006] G43.78+0.05 MoC 19 11 14.380 +09 39 36.89           ~ 2 0
62 GAL 044.26+00.10 HII 19 11 56.53 +10 07 02.1           ~ 7 0
63 GAL 043.18-00.52 HII 19 12 23.19 +08 32 12.2           ~ 43 0
64 [RBP2006] G43.64-0.82 MoC 19 14 07.050 +09 08 24.64           ~ 2 0
65 GAL 043.89-00.78 HII 19 14 26.16 +09 22 34.0           ~ 53 0
66 IRAS 19191+1538 HII 19 21 27.2 +15 44 15           ~ 15 0
67 GAL 050.23+00.33 HII 19 22 34.688 +15 30 10.01           ~ 5 0
68 [RBP2006] G50.07+0.06 MoC 19 23 14.360 +15 13 58.11           ~ 2 0
69 GAL 054.10-00.06 HII 19 31 42.22 +18 42 51.6           ~ 10 0
70 [RBP2006] G53.88-0.18 MoC 19 31 42.730 +18 27 55.78           ~ 2 0
71 SH 2-88 B HII 19 46 48.2 +25 12 21           ~ 159 2
72 [RBP2006] G75.75+0.75 MoC 20 19 57.750 +37 39 01.90           ~ 2 0
73 GAL 075.78+00.34 cor 20 21 44.00 +37 26 38.0           ~ 131 1
74 [RBP2006] G76.38+0.63 MoC 20 22 17.040 +38 05 50.23           ~ 2 0

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