2014MNRAS.445.1170G

Query : 2014MNRAS.445.1170G

2014MNRAS.445.1170G - Mon. Not. R. Astron. Soc., 445, 1170-1185 (2014/December-1)

Early-stage star-forming cloud cores in Galactic Legacy Infrared Mid-Plane Survey (GLIMPSE) extended green objects (EGOs) as traced by organic species.

GE J.X., HE J.H., CHEN X. and TAKAHASHI S.

Abstract (from CDS):

In order to investigate the physical and chemical properties of massive star-forming cores in the early stages, we analyse the excitation and abundance of four organic species, CH3OH, CH3OCH3, HCOOCH3 and CH3CH2CN, towards 29 extended green object (EGO) cloud cores that were observed by our previous single-dish spectral line survey. The EGO cloud cores are found to have similar methanol J3-J2 rotation temperatures of ∼ 44K, a typical linear size of ∼ 0.036pc and a typical beam-averaged methanol abundance of several 10–9 (the beam-corrected value could reach several 10–7). The abundances of the latter three species, normalized by that of methanol, are also found to be correlated across a large variety of clouds such as EGO cloud cores, hot corinos, massive hot cores and Galactic Centre clouds. The chemical properties of the EGO cloud cores lie between those of hot cores and hot corinos. However, the abundances and abundance ratios of the four species cannot be explained satisfactorily by recent chemical models, either among EGO cloud cores or among the various types of cloud core from literature.

Abstract Copyright: © 2014 The Authors Published by Oxford University Press on behalf of the Royal Astronomical Society (2014)

Journal keyword(s): astrochemistry - ISM: abundances - ISM: clouds - ISM: evolution - ISM: molecules - submillimetre: ISM

Simbad objects: 53

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Number of rows : 53
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(H2O) Mas 02 27 04.6 +61 52 25           ~ 154 0
2 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 513 3
3 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 625 0
4 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 965 0
5 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 1249 2
6 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 212 0
7 NAME Orion Molecular Cloud MoC 05 56 -01.8           ~ 1227 1
8 RCW 97 HII 15 53 05.0 -54 35 24           ~ 171 0
9 NAME Ophiuchus Molecular Cloud SFR 16 28 06 -24 32.5           ~ 3969 1
10 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1357 1
11 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 244 1
12 LDN 57 DNe 17 22 38.2 -23 49 34           ~ 336 1
13 NAME Galactic Center reg 17 45 39.60213 -29 00 22.0000           ~ 16269 0
14 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2443 1
15 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 436 1
16 EGO G010.34-0.14 of? 18 09 00.04560 -20 03 34.6068           ~ 18 0
17 AGAL G012.418+00.506 cor 18 10 51.09792 -17 55 49.6272           ~ 74 0
18 EGO G012.20-0.03 of? 18 12 23.6 -18 22 54           ~ 10 0
19 EGO G012.68-0.18 of? 18 13 54.7 -18 01 47           ~ 10 0
20 EGO G011.92-0.61 of? 18 13 58.1 -18 54 17           ~ 54 0
21 EGO G012.91-0.26 of? 18 14 39.5 -17 52 00           ~ 9 0
22 W 33a Y*O 18 14 39.56547 -17 52 02.2260           ~ 746 0
23 EGO G014.33-0.64 of? 18 18 54.4 -16 47 46           ~ 15 0
24 EGO G014.63-0.58 of? 18 19 15.4 -16 30 07           ~ 16 0
25 EGO G016.59-0.05 HII 18 21 07.9 -14 31 53           ~ 129 0
26 EGO G019.01-0.03 of? 18 25 44.8 -12 22 46           ~ 28 0
27 EGO G019.36-0.03 of? 18 26 25.8 -12 03 57           ~ 17 0
28 EGO G018.89-0.47 of? 18 27 07.9 -12 41 36           ~ 19 0
29 EGO G019.88-0.53 of? 18 29 14.7 -11 50 23           ~ 14 0
30 EGO G022.04+0.22 of? 18 30 34.7 -09 34 47           ~ 23 0
31 EGO G023.01-0.41 of? 18 34 40.2 -09 00 38           ~ 24 0
32 MSX5C G024.3293+00.1463 Y*O 18 35 08.17416 -07 35 04.7472           ~ 14 0
33 EGO G023.96-0.11 of? 18 35 22.3 -08 01 28           ~ 16 0
34 EGO G024.00-0.10 Y*? 18 35 23.505 -07 59 31.24           ~ 11 0
35 GAL 024.78+00.08 HII 18 36.2 -07 13           ~ 89 0
36 AGAL G025.382-00.147 Y*O 18 38 08.167 -06 46 53.19           ~ 26 0
37 AGAL G028.273-00.167 MoC 18 43 30.7 -04 13 12           ~ 39 0
38 MSXDC G028.23-00.19 DNe 18 43 31.3 -04 13 18           ~ 27 0
39 EGO G034.26+0.15 of? 18 53 16.4 +01 15 07           ~ 14 0
40 EGO G034.41+0.24 of? 18 53 17.9 +01 25 25           ~ 18 0
41 RAFGL 2271 SFR 18 53 18.54 +01 14 57.9           ~ 537 0
42 EGO G035.03+0.35 of? 18 54 00.5 +02 01 18           ~ 40 0
43 EGO G035.79-0.17 of? 18 57 16.7 +02 27 56           ~ 9 0
44 EGO G035.13-0.74 of? 18 58 06.4 +01 37 01           ~ 13 0
45 [DLW84] G35.2N HII 18 58 13.036 +01 40 36.00           ~ 138 0
46 EGO G040.28-0.22 of? 19 05 41.3 +06 26 13           ~ 9 0
47 EGO G045.47+0.05 of? 19 14 25.6 +11 09 28           ~ 16 0
48 W 51 SNR 19 23 50 +14 06.0           ~ 1352 1
49 SSTGLMC G054.1098-00.0813 Y*? 19 31 48.7978 +18 42 57.096           ~ 13 0
50 EGO G059.79+0.63 of? 19 41 03.1 +24 01 15           ~ 9 0
51 GAL 075.78+00.34 cor 20 21 44.00 +37 26 38.0           ~ 131 1
52 RAFGL 2591 Y*O 20 29 24.8230 +40 11 19.590           ~ 640 0
53 [WBN74] NGC 7538 IRS 1 Y*O 23 13 45.318 +61 28 11.69           ~ 433 3

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