2001ApJ...558..194P

Query : 2001ApJ...558..194P

2001ApJ...558..194P - Astrophys. J., 558, 194-203 (2001/September-1)

A methyl cyanide search for the earliest stages of massive protostars.

PANKONIN V., CHURCHWELL E., WATSON C. and BIEGING J.H.

Abstract (from CDS):

Forty-eight candidate massive protostar regions were surveyed for methyl cyanide (CH3CN) emission using the Heinrich Hertz Telescope (HHT) on Mount Graham, AZ. CH3CN J=12-11 emission at 220 GHz was detected toward 25 regions. Thirteen of these are new detections, yielding a substantial number of new candidates for massive protostars. The CH313CN (J=12-11) isotopomer was included in the bandpass of all observed sources and was detected toward eight sources in our sample. These sources are probably optically thick in some of the CH3CN lines. CH3CN J=25-24 emission at 460 GHz was detected in at least one K-component toward five of 11 sources observed in this transition. Using a rotational equilibrium temperature analysis we estimate the CH3CN rotation temperatures and beam-averaged column densities for 20 of the sources.

Abstract Copyright: ∼

Journal keyword(s): ISM: H II Regions - ISM: Molecules - Stars: Formation

Simbad objects: 68

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Number of rows : 68
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 IRAS 01420+6401 HII 01 45 40.16013 +64 16 09.0770           ~ 32 1
2 NAME W3 IRS 5 Y*O 02 25 40.54 +62 05 51.4           B1 367 0
3 NAME W 3 OH HII 02 27 04.1 +61 52 22           ~ 1064 2
4 RAFGL 490 Or* 03 27 38.7928952784 +58 47 00.025298088           ~ 359 0
5 [RLK73] IRc 2 IR 05 35 14.51548 -05 22 30.5943           ~ 673 1
6 IRAS 05361+3539 HII 05 39 28.67 +35 40 38.7           ~ 41 0
7 GAL 192.16-03.82 HII 05 58 13.4 +16 32 00           ~ 145 1
8 NAME Mon R2 IRS 1 cor 06 07 46.20 -06 23 09.5           B0 65 0
9 NAME Mon R2 HII 06 07 47.58 -06 22 42.6           ~ 789 2
10 IRAS 07427-2400 HII 07 44 51.997 -24 07 42.11           ~ 78 0
11 NAME rho Oph A Cloud MoC 16 26 26.4 -24 22 33           ~ 312 1
12 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 400 0
13 RAFGL 2046 HII 18 00 32.1 -24 04 03           ~ 380 0
14 AGAL G005.899-00.429 smm 18 00 40.898 -24 04 22.09           ~ 20 0
15 GAL 009.62+00.19 HII 18 06 13.9 -20 31 44           ~ 226 0
16 [GRM93] G09.61+0.20 F Rad 18 06 14.89 -20 31 38.9           ~ 29 1
17 GAL 010.46+00.03 HII 18 08 35.5 -19 52 09           ~ 59 0
18 GAL 010.47+00.03 HII 18 08 38.4 -19 51 52           ~ 159 0
19 W 31c HII 18 10 29.1 -19 56 05           ~ 357 0
20 IRAS 18097-1825A cor 18 12 39.72 -18 24 20.5           ~ 69 0
21 Caswell CH3OH 012.20-00.11 Mas 18 12 40.1 -18 24 47           ~ 2 0
22 MMB G012.202-00.120 Mas 18 12 42.93 -18 25 11.8           ~ 28 0
23 GAL 013.875+00.28 HII 18 14 35.2 -16 45 21           ~ 99 0
24 RAFGL 7009S HII 18 34 20.911 -05 59 42.23           ~ 231 0
25 [WAM82] 023.955+0.152 HII 18 34 24.9 -07 54 50           ~ 70 1
26 CORNISH G029.9559-00.0168 Y*O 18 46 04.18 -02 39 21.3           ~ 385 0
27 IRAS 18449-0115 cor 18 47 34.27 -01 12 43.2           ~ 430 1
28 W 43s Rad 18 47 41.68 -02 00 24.3           ~ 30 0
29 GAL 031.40-00.26 HII 18 49 33.04 -01 29 03.7           ~ 53 0
30 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
31 SNR G034.6-00.5 SNR 18 56 10.650 +01 13 21.30           ~ 1034 2
32 [DLW84] G35.2N HII 18 58 13.036 +01 40 36.00           ~ 138 0
33 [TRP85] G35.2N IRS 1 Y*O 18 58 13.106 +01 40 39.90           ~ 15 0
34 Caswell OH 035.20-01.74 Mas 19 01 45.2 +01 13 34           ~ 28 0
35 GAL 035.20-01.74 Y*O 19 01 46.49 +01 13 24.7           ~ 78 1
36 IRAS 19110+1045 Y*O 19 13 22.0427 +10 50 53.336           ~ 132 0
37 Caswell OH 045.12+00.13 HII 19 13 27.85 +10 53 36.7           ~ 121 0
38 [BE83] Maser 049.49-00.37 Mas 19 23 39.429 +14 31 04.65           ~ 13 0
39 [WBN74] W 51 IRS 2 SFR 19 23 39.93 +14 31 09.4           ~ 321 0
40 NAME W 51 North Rad 19 23 40.0 +14 30 51           ~ 169 0
41 NAME SH 2-87 IRS 1 HII 19 46 20.130 +24 35 29.43           ~ 17 0
42 SH 2-87 bub 19 46 20.69 +24 35 15.4           ~ 161 2
43 [KCW94] 069.540-00.975 HII 20 10 08.95 +31 31 35.4           ~ 168 1
44 IRAS 20081+3122 Y*O 20 10 09.036 +31 31 34.14           ~ 172 0
45 Onsala 1 cor 20 10 09.2036 +31 31 36.090           ~ 194 0
46 IRAS 20126+4104 Y*O 20 14 25.8816769656 +41 13 36.879427236           B2.5-B0.5 469 0
47 V* BC Cyg s*r 20 21 38.5478957040 +37 31 58.925226936   14.61 11.30     M3.5Ia 171 0
48 OH 075.8+00.3 HII 20 21 43.8 +37 26 39           ~ 95 2
49 GAL 075.78+00.34 cor 20 21 44.00 +37 26 38.0           ~ 131 1
50 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 640 0
51 GAL 078.89+00.71 Mas 20 29 24.9 +40 11 21           ~ 4 0
52 NAME Cyg X FIR 33 Y*O 20 38 35.9 +42 37 22           B1.5 423 1
53 GAL 081.87+00.78 Mas 20 38 36.9 +42 37 38           ~ 11 0
54 DR 21 SFR 20 39 01.6 +42 19 38           O4.5 1121 0
55 SH 2-128 HII 21 32 09.9 +55 52 53           ~ 173 1
56 2MASS J21430143+5456183 Y*O 21 43 01.4400 +54 56 17.800           ~ 64 2
57 SH 2-140 OpC 22 19 07.8 +63 17 07           ~ 668 2
58 IRAS 22176+6303 Y*O 22 19 18.23 +63 18 47.5           ~ 600 0
59 NAME SH 2-140 IRS 1 Y*O 22 19 18.277 +63 18 45.82           ~ 201 0
60 SH 2-138 HII 22 32 45.7 +58 28 20           ~ 115 2
61 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 760 2
62 GAL 109.87+02.11 Mas 22 56 18.1 +62 01 46           ~ 12 0
63 GAL 109.88+02.11 HII 22 56 19.4 +62 02 01           ~ 76 0
64 IC 1470 HII 23 05 09.9 +60 14 31   11.5       ~ 180 2
65 IRAS 23118+6110 Y*O 23 14 02.09473 +61 27 18.8460           ~ 385 0
66 SH 2-159 Y*O 23 15 31.2384366062 +61 07 10.181362705           ~ 188 1
67 IRAS 23139+5939 Y*O 23 16 10.3420 +59 55 28.596           ~ 100 0
68 Mol 160 Rad 23 40 54.5 +61 10 28           ~ 121 0

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