2006A&A...460..721M


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.11CET22:27:41

2006A&A...460..721M - Astronomy and Astrophysics, volume 460, 721-731 (2006/12-4)

SiO and CH3CCH abundances and dust emission in high-mass star-forming cores.

MIETTINEN O., HARJU J., HAIKALA L.K. and POMREN C.

Abstract (from CDS):

We determine the fractional SiO abundance in high-mass star-forming cores, and investigate its dependence on physical conditions, to provide constraints on the chemistry models of the formation of SiO in the gas phase or via grain mantle evaporation. The work addresses also CH3CCH chemistry, as the kinetic temperature is determined using this molecule. We estimate the physical conditions of 15 high-mass star-forming cores and derive the fractional SiO and CH3CCH abundances using spectral line and dust continuum observations with the SEST. The kinetic temperatures as derived from CH3CCH range from 25 to 39K, the average being 33K. The average gas density in the cores is 4.5x106cm–3. The SiO emission regions are extended and typically half of the integrated line emission comes from the velocity range traced out by CH3CCH emission. The upper limit of SiO abundance in this ``quiescent'' gas component is ∼10–10. The average CH3CCH abundance is about 7x10–9. It shows a shallow, positive correlation with the temperature, whereas SiO shows the opposite tendency. We suggest that the high CH3CCH abundance and its possible increase when the clouds become warmer is related to the intensified desorption of the chemical precursors of the molecule from grain surfaces. In contrast, the observed tendency of SiO does not support the idea that the evaporation of Si-containing species from the grain mantles would be important, and it contradicts models where neutral reactions with activation barriers dominate SiO production. A possible explanation for the decrease is that warmer cores represent more evolved stages of core evolution with fewer high-velocity shocks and thus less efficient SiO replenishment.

Abstract Copyright:

Journal keyword(s): ISM: clouds - ISM: molecules - molecular data - radio continuum: ISM - radio lines: ISM - stars: formation

CDS comments: Paragraph 5.3 IRAS 15048-5356 is a misprint for IRAS 15408-5356.

Simbad objects: 55

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Number of rows : 55

N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2020
#notes
1 NAME OMC1 Ridge reg 05 35 13.4 -05 23 07           ~ 120 0
2 NAME OMC-1 MoC 05 35 14 -05 22.4           ~ 991 2
3 IRAS 12326-6245 mul 12 35 34.1 -63 02 28           ~ 28 0
4 [HLS2000] MIR 2 IR 12 35 35.13 -63 02 24.9           ~ 3 0
5 [HLS2000] MIR 1 IR 12 35 35.21 -63 02 31.6           ~ 3 0
6 GAL 301.12-00.20 HII 12 35 35.9 -63 02 29           ~ 28 0
7 [DBS2003] 95 HII 15 44 42.8 -54 05 56           ~ 53 0
8 IRAS 15411-5352 HII 15 44 59.448 -54 02 13.92           ~ 32 2
9 IRAS 15412-5359 IR 15 45 03.4 -54 09 08           ~ 9 0
10 OH 328.81 +0.63 Mas 15 55 47.3 -52 43 08           ~ 16 0
11 IRAS 15520-5234 HII 15 55 48.336 -52 43 10.20           ~ 34 1
12 IRAS 15566-5304 mul 16 00 30.8 -53 12 35           ~ 10 0
13 IRAS 16060-5146 HII 16 09 52.776 -51 54 52.20           ~ 21 0
14 IRAS 16533-4009 HII 16 56 45.58 -40 14 32.4           ~ 46 0
15 IRAS 16562-3959 SFR 16 59 42.257 -40 03 45.17           ~ 41 0
16 IRAS 17016-4124 SFR 17 05 11.160 -41 29 06.00           ~ 47 0
17 HD 319699 * 17 19 30.4179094473 -35 42 36.122491362 10.17 10.31 9.63 9.81 8.91 O5V((fc)) 55 0
18 VdBH 86 RNe 17 19 46 -36 05.8           ~ 59 0
19 HD 319703 *iN 17 19 46.1633241923 -36 05 52.329002002 11.9 11.73 10.92 10.46 9.30 O7V((f))z 56 0
20 NAME NGC 6334 FIR V Cl* 17 19 57 -35 57.5           ~ 81 0
21 GAL 351.20+00.70 HII 17 20 04.1 -35 56 10           ~ 11 0
22 NAME NGC 6334-IV Cl* 17 20 17 -35 54.9           ~ 40 1
23 NGC 6334A HII 17 20 19.3 -35 54 55           ~ 113 0
24 NAME NGC 6334-III Cl* 17 20 32 -35 51.5           ~ 22 1
25 NGC 6334D HII 17 20 44.2 -35 49 18           ~ 35 0
26 NAME NGC 6334-II Cl* 17 20 45 -35 49.4           ~ 28 1
27 HD 319702 * 17 20 50.6127602130 -35 51 46.032286972 10.94 11.04 10.11 10.10   O8III 43 0
28 NGC 6334 HII 17 20 51 -36 06.9           ~ 559 0
29 NGC 6334E HII 17 20 50.9 -35 46 06           ~ 49 0
30 HD 156738 * 17 20 52.6585219138 -36 04 20.561546134 10.06 10.27 9.35 9.65   O6.5III(f) 66 0
31 NAME NGC 6334-I Cl* 17 20 53.35 -35 47 01.5           ~ 256 0
32 NAME NGC 6334F (C) HII 17 20 53.45 -35 47 02.6           ~ 200 1
33 NAME NGC 6334 I(N) smm 17 20 54 -35 45.0           ~ 120 1
34 JCMTSF J172054.7-354226 smm 17 20 55.21 -35 42 36.0           ~ 5 0
35 IRAS 17233-3606 HII 17 26 42.8 -36 09 17           ~ 67 0
36 GAL 353.41-00.36 HII 17 30 26.2 -34 41 45           ~ 32 1
37 GAL 005.88-00.41 HII 18 00 30.388 -24 04 00.20           ~ 290 0
38 SNR G006.4-00.1 SNR 18 01 22.7 -23 17 20           ~ 631 1
39 GAL 010.30-00.15 HII 18 08 58.315 -20 05 15.27           ~ 77 0
40 GAL 010.15-00.34 HII 18 09 21.5680 -20 19 27.720           ~ 72 0
41 GAL 010.2-00.3 HII 18 09 24.6 -20 19 29           ~ 77 1
42 W 31 SFR 18 10 28.6 -19 55 51           ~ 240 0
43 W 31c HII 18 10 29.1 -19 56 05           ~ 298 0
44 W 33b SFR 18 13 54.68 -18 01 48.1           ~ 73 0
45 IRAS 18112-1801 * 18 14 08.2991289321 -18 00 23.354734283           B0-5 12 0
46 NAME W 33-Met HII 18 14 12.5 -17 55 44           ~ 26 0
47 [JGD81] FIR 012.81-0.19 IR 18 14 12.8 -17 55 20           ~ 3 0
48 GAL 012.81-00.20 HII 18 14 13.3 -17 55 36           ~ 4 0
49 GRS G012.80 -00.20 Rad 18 14 13.9 -17 55 44           ~ 13 0
50 SNR G012.8-00.2 SFR 18 14 14.0 -17 55 50           ~ 213 0
51 W 33a Y*O 18 14 39.0 -17 52 03           ~ 570 0
52 NGC 6618 OpC 18 20 47 -16 10.3           ~ 1455 0
53 NGC 7129 OpC 21 42 56 +66 06.2     11.5     ~ 230 0
54 NAME Cepheus A SFR 22 56 17.9 +62 01 49           ~ 691 2
55 [FSH99] H2 B reg ~ ~           ~ 3 0

    Equat.    Gal    SGal    Ecl

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2019.11.11-22:27:41

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