2019ApJ...872...61H

Query : 2019ApJ...872...61H

2019ApJ...872...61H - Astrophys. J., 872, 61-61 (2019/February-2)

A mini survey of methyl cyanide toward Extended Green Objects.

HUNG T., LIU S.-Y., SU Y.-N., HE J.H., LEE H.-T., TAKAHASHI S. and CHEN H.-R.

Abstract (from CDS):

We present results of a survey of methyl cyanide (CH3CN) J = 12-11 toward 56 sources, including 35 Extended Green Objects (EGOs) and 21 nearby AKARI counterparts, with the Submillimeter Telescope (SMT) in order to characterize the nature of EGOs. CH3CN, a tracer of hot core emission, is detected in 19 EGOs (∼54%) and five AKARI bright sources (∼24%). By analyzing the observed CH3CN features, we find an average line width of 6.5 km s–1. For the sources detected with CH3CN, we derive CH3CN column densities log10(N [cm–2]) = 14-17 with gas temperatures in the range 40-300 K. The small filling factors (10–2-10–4) may reflect the rather compact CH3CN emitting regions, which correspond to linear sizes of ∼0.01-0.08 pc. We also estimate the virial masses and gas masses of these sources. Our derived gas masses are lower than the virial masses, possibly because CH3CN traces more energetic motions such as outflows and shocks. Alternatively, we cannot rule out that the virial masses are overestimated due to the presence of unresolved CH3CN kinetic components, such as the rotation structures observed around the young stellar objects.

Abstract Copyright: © 2019. The American Astronomical Society. All rights reserved.

Journal keyword(s): ISM: general - stars: formation - submillimeter: ISM

Simbad objects: 65

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Number of rows : 65
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 W 3 MoC 02 27 04.10 +61 52 27.1           ~ 1064 3
2 IRAS 17233-3606 HII 17 26 42.8 -36 09 17           ~ 98 0
3 RAFGL 2046 HII 18 00 32.1 -24 04 03           ~ 380 0
4 EGO G010.29-0.13 of? 18 08 49.3 -20 05 57           ~ 16 0
5 EGO G010.34-0.14 of? 18 09 00.04560 -20 03 34.6068           ~ 18 0
6 AGAL G012.418+00.506 cor 18 10 51.09792 -17 55 49.6272           ~ 74 0
7 EGO G012.68-0.18 of? 18 13 54.7 -18 01 47           ~ 10 0
8 EGO G011.92-0.61 of? 18 13 58.1 -18 54 17           ~ 54 0
9 [CBH2011b] G11.92-0.61 MM1 mm 18 13 58.103 -18 54 20.19           ~ 41 0
10 AKARI-FIS-V1 J1814004-185335 IR 18 14 00.4 -18 53 35           ~ 1 0
11 EGO G014.63-0.58 of? 18 19 15.4 -16 30 07           ~ 16 0
12 EGO G016.59-0.05 HII 18 21 07.9 -14 31 53           ~ 129 0
13 AKARI-FIS-V1 J1821090-143210 IR 18 21 09.0 -14 32 10           ~ 1 0
14 RAFGL 2136 Y*O 18 22 26.52888 -13 30 14.0400           ~ 300 0
15 AKARI-FIS-V1 J1824529-123936 IR 18 24 52.9 -12 39 36           ~ 1 0
16 EGO G018.67+0.03 of? 18 24 53.7 -12 39 20           ~ 24 0
17 EGO G019.01-0.03 of? 18 25 44.8 -12 22 46           ~ 28 0
18 EGO G019.36-0.03 of? 18 26 25.8 -12 03 57           ~ 17 0
19 AKARI-FIS-V1 J1827046-124145 IR 18 27 04.6 -12 41 45           ~ 1 0
20 EGO G018.89-0.47 of? 18 27 07.9 -12 41 36           ~ 19 0
21 GAL 019.61-00.23 HII 18 27 38.0 -11 56 42           ~ 162 0
22 MMB G019.884-00.534 cor 18 29 14.37 -11 50 23.0           ~ 119 1
23 EGO G019.88-0.53 of? 18 29 14.7 -11 50 23           ~ 14 0
24 AKARI-FIS-V1 J1830344-093506 IR 18 30 34.4 -09 35 06           ~ 1 0
25 EGO G022.04+0.22 of? 18 30 34.7 -09 34 47           ~ 23 0
26 AKARI-FIS-V1 J1834400-090056 IR 18 34 40.0 -09 00 56           ~ 1 0
27 EGO G023.01-0.41 of? 18 34 40.2 -09 00 38           ~ 24 0
28 MSX5C G024.3293+00.1463 Y*O 18 35 08.17416 -07 35 04.7472           ~ 14 0
29 EGO G023.96-0.11 of? 18 35 22.3 -08 01 28           ~ 16 0
30 AKARI-FIS-V1 J1835231-080003 IR 18 35 23.1 -08 00 03           ~ 1 0
31 EGO G024.00-0.10 Y*? 18 35 23.505 -07 59 31.24           ~ 11 0
32 AKARI-FIS-V1 J1836281-070448 IR 18 36 28.1 -07 04 48           ~ 1 0
33 EGO G024.94+0.07 of? 18 36 31.5 -07 04 16           ~ 14 0
34 AGAL G025.382-00.147 Y*O 18 38 08.167 -06 46 53.19           ~ 26 0
35 EGO G025.27-0.43 of? 18 38 57.0 -07 00 48           ~ 14 0
36 IRAS 18362-0703 Y*O 18 38 57.67560 -07 01 17.0580           ~ 18 0
37 EGO G028.28-0.36 of? 18 44 13.2 -04 18 04           ~ 20 0
38 RAFGL 2243 Y*O 18 44 15.083 -04 17 58.55           ~ 28 0
39 EGO G028.83-0.25 of? 18 44 51.3 -03 45 48           ~ 20 0
40 IRAS 18421-0348 Cld 18 44 51.414 -03 45 28.68           ~ 29 0
41 RAFGL 5541 Y*O 18 52 50.26 +00 55 29.6           ~ 122 1
42 EGO G034.26+0.15 of? 18 53 16.4 +01 15 07           ~ 14 0
43 AKARI-FIS-V1 J1853186+012504 IR 18 53 18.6 +01 25 04           ~ 1 0
44 EGO G034.39+0.22 of? 18 53 19.0 +01 24 08           ~ 12 0
45 AKARI-FIS-V1 J1853192+011447 IR 18 53 19.2 +01 14 47           ~ 1 0
46 EGO G035.03+0.35 of? 18 54 00.5 +02 01 18           ~ 40 0
47 AKARI-FIS-V1 J1857164+022819 IR 18 57 16.4 +02 28 19           ~ 1 0
48 EGO G035.79-0.17 of? 18 57 16.7 +02 27 56           ~ 9 0
49 EGO G035.13-0.74 of? 18 58 06.4 +01 37 01           ~ 13 0
50 [DLW84] G35.2S HII 18 58 10.4846977680 +01 36 57.226716432   16.80 14.72 14.37 12.22 ~ 60 4
51 AKARI-FIS-V1 J1900060+035941 IR 19 00 06.0 +03 59 41           ~ 1 0
52 EGO G037.48-0.10 of? 19 00 07.0 +03 59 53           ~ 13 0
53 AKARI-FIS-V1 J1900575+054308 IR 19 00 57.5 +05 43 08           ~ 1 0
54 EGO G039.10+0.49 of? 19 00 58.1 +05 42 44           ~ 14 0
55 AKARI-FIS-V1 J1905406+062625 IR 19 05 40.6 +06 26 25           ~ 1 0
56 EGO G040.28-0.22 of? 19 05 41.3 +06 26 13           ~ 9 0
57 AKARI-FIS-V1 J1914220+110908 IR 19 14 22.0 +11 09 08           ~ 1 0
58 EGO G045.47+0.05 of? 19 14 25.6 +11 09 28           ~ 16 0
59 AKARI-FIS-V1 J1920574+144633 IR 19 20 57.4 +14 46 33           ~ 1 0
60 EGO G049.42+0.33 of? 19 20 59.1 +14 46 53           ~ 10 0
61 EGO G049.27-0.34 of? 19 23 06.7 +14 20 13           ~ 20 0
62 EGO G058.78+0.64 of? 19 38 49.6 +23 08 40           ~ 7 0
63 EGO G059.79+0.63 of? 19 41 03.1 +24 01 15           ~ 9 0
64 AKARI-FIS-V1 J1941036+240100 IR 19 41 03.6 +24 01 00           ~ 1 0
65 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 606 0

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