2006A&A...455..971R


Query : 2006A&A...455..971R

2006A&A...455..971R - Astronomy and Astrophysics, volume 455, 971-985 (2006/9-1)

Organic molecules in the Galactic center. Hot core chemistry without hot cores.

REQUENA-TORRES M.A., MARTIN-PINTADO J., RODRIGUEZ-FRANCO A., MARTIN S., RODRIGUEZ-FERNANDEZ N.J. and DE VICENTE P.

Abstract (from CDS):

We study the origin of large abundances of complex organic molecules in the Galactic center (GC).We carried out a systematic study of the complex organic molecules CH3OH, C2H5OH, (CH3)2O, HCOOCH3, HCOOH, CH3COOH, H2CO, and CS toward 40 GC molecular clouds. Using the LTE approximation, we derived the physical properties of GC molecular clouds and the abundances of the complex molecules. The abundances of complex organic molecules in the GC are compared with those measured in hot cores and hot corinos, in which these complex molecules are also abundant. The CH3OH abundance between clouds varies by nearly two orders of magnitude from 2.4x10–8 to 1.1x10–6. The abundance of the other complex organic molecules relative to that of CH3OH is basically independent of the CH3OH abundance, with variations of only a factor 4-8. We find that both the abundance and the abundance ratios of the complex molecules relative to CH3OH in hot cores are similar to those found in the GC clouds. However, hot corinos show different abundance ratios than observed in hot cores and in GC clouds. The rather constant abundance of all the complex molecules relative to CH3OH suggests that all complex molecules are ejected from grain mantles by shocks. Frequent (∼105years) shocks with velocities >6km/s are required to explain the high abundances in gas phase of complex organic molecules in the GC molecular clouds. The rather uniform abundance ratios in the GC clouds and in Galactic hot cores indicate a similar average composition of grain mantles in both kinds of regions. The Sickle and the Thermal Radio Arches, affected by UV radiation, show different relative abundances in the complex organic molecules due to the differentially photodissociation of these molecules.

Abstract Copyright:

Journal keyword(s): astrochemistry - ISM: clouds - ISM: molecules - radio lines: ISM - Galaxy: center

VizieR on-line data: <Available at CDS (J/A+A/455/971): table1.dat table2.dat table7.dat table7.tex>

Nomenclature: Table 2: GCM +LL .lll+BB.bbb N=10.

Simbad objects: 61

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Number of rows : 61
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2021
#notes
1 LDN 1448 DNe 03 22.5 +30 35           ~ 488 0
2 [JCC87] IRAS 2A Y*O 03 28 55.55 +31 14 36.7           ~ 415 3
3 [JCC87] IRAS 4A Y*O 03 29 10.49 +31 13 30.8           ~ 633 1
4 [JCC87] IRAS 4 FIR 03 29 10.9 +31 13 26           ~ 472 0
5 NGC 1333 OpC 03 29 11 +31 18.6           ~ 1271 1
6 [JCC87] IRAS 4B Y*O 03 29 12.058 +31 13 02.05           ~ 570 0
7 NAME Orion Core ? 05 35 14.5 -05 22 30           ~ 180 0
8 GAL 327.30-00.60 HII 15 53 05.0 -54 35 24           ~ 125 0
9 IRAS 16293-2422 cor 16 32 22.56 -24 28 31.8           ~ 1105 1
10 NAME IRAS 16293-2422B Y*O 16 32 22.63 -24 28 31.8           ~ 208 0
11 NAME IRAS 16293-2422A Y*O 16 32 22.869 -24 28 36.11           ~ 124 0
12 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 211 1
13 GCM -0.96 +0.13 MoC 17 42 48.3 -29 41 09           ~ 7 0
14 JCMTSF J174431.2-292538 MoC 17 44 31.3 -29 25 45           ~ 6 0
15 GCM -0.50 -0.03 MoC 17 44 32.5 -29 22 42           ~ 7 0
16 GCM -0.42 -0.01 MoC 17 44 35.2 -29 17 05           ~ 4 0
17 NAME Sgr C MoC 17 44 36.3 -29 28 13           ~ 325 0
18 NAME Sgr A Region reg 17 45 12 -28 48.3           ~ 925 0
19 GCM -0.32 -0.19 MoC 17 45 35.9 -29 18 30           ~ 8 0
20 GCM +0.04 +0.03 MoC 17 45 37 -28 53.0           ~ 3 0
21 GCM -0.11 -0.08 MoC 17 45 39 -29 04.1           ~ 15 0
22 NAME Galactic Center gam 17 45 39.60213 -29 00 22.0000           ~ 12320 0
23 GCM -0.08 -0.06 MoC 17 45 41 -29 02.2           ~ 2 0
24 NAME Arched Filaments PoC 17 45 46.9 -28 50 39           ~ 48 1
25 GCM -0.02 -0.07 MoC 17 45 50.4 -28 59 06           ~ 151 0
26 NAME Arches Cluster Cl* 17 45 50.5 -28 49 28           ~ 666 0
27 GCM +0.17 +0.01 MoC 17 45 52 -28 48.7           ~ 2 0
28 GCM +0.13 +0.02 MoC 17 45 52 -28 48.7           ~ 2 0
29 GCM +0.07 -0.07 MoC 17 46 05 -28 54.7           ~ 8 0
30 GCM +0.24 +0.01 MoC 17 46 10 -28 43.7           ~ 5 0
31 GCM +0.18 -0.04 MoC 17 46 11 -28 48.4           ~ 5 0
32 GCM +0.20 -0.03 MoC 17 46 14 -28 46.8           ~ 10 0
33 NAME Sickle HII 17 46 15.2 -28 49 49           ~ 113 0
34 NAME Sgr B MoC 17 47 02 -28 25.4           ~ 201 0
35 GCM +0.694 -0.017 MoC 17 47 09.8 -28 21 08           ~ 2 0
36 GCM +0.672 -0.014 MoC 17 47 15.9 -28 22 08           ~ 1 0
37 GCM +0.673 -0.025 MoC 17 47 18.9 -28 22 27           ~ 1 0
38 GCM +0.659 -0.035 MoC 17 47 18.9 -28 23 27           ~ 1 0
39 GCM +0.640 -0.046 MoC 17 47 19.0 -28 24 47           ~ 1 0
40 GCM +0.70 -0.01 MoC 17 47 20 -28 20.5           ~ 3 0
41 NAME Sgr B2M Mas 17 47 20.13 -28 23 06.1           ~ 37 1
42 NAME Sgr B2 (North) Rad 17 47 20.2 -28 22 21           ~ 567 1
43 GCM +0.681 -0.028 MoC 17 47 20.4 -28 22 07           ~ 1 0
44 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 2023 1
45 GCM +0.693 -0.027 MoC 17 47 21.9 -28 21 27           ~ 21 0
46 GCM +0.627 -0.067 MoC 17 47 22.0 -28 26 07           ~ 1 0
47 GCM +0.635 -0.069 MoC 17 47 23.5 -28 25 47           ~ 1 0
48 GCM +0.630 -0.072 MoC 17 47 23.5 -28 26 07           ~ 1 0
49 GCM +0.62 -0.10 MoC 17 47 27 -28 27.5           ~ 3 0
50 GCM +0.64 -0.08 MoC 17 47 27 -28 25.5           ~ 2 0
51 GCM +0.67 -0.06 MoC 17 47 27 -28 23.5           ~ 2 0
52 GCM +0.76 -0.05 MoC 17 47 36.8 -28 18 31           ~ 7 0
53 GCM +0.68 -0.10 MoC 17 47 37 -28 24.3           ~ 3 0
54 GCM +0.70 -0.09 MoC 17 47 37 -28 23.1           ~ 2 0
55 GCM +0.71 -0.13 MoC 17 47 48 -28 23.4           ~ 2 0
56 GAL 010.47+00.03 HII 18 08 38.4 -19 51 52           ~ 115 0
57 IRAS 18449-0115 cor 18 47 34.4947 -01 12 40.269           ~ 327 0
58 OH 34.26 +0.15 SFR 18 53 18.54 +01 14 57.9           ~ 475 0
59 W 51e1 Rad 19 23 43.77 +14 30 25.9           ~ 117 0
60 W 51e2 Rad 19 23 43.90 +14 30 34.8           ~ 189 0
61 LDN 1157 DNe 20 39 06.4 +68 02 13           ~ 513 0

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2021.08.04-00:09:09

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