2011A&A...527A..88V


C.D.S. - SIMBAD4 rel 1.7 - 2020.01.26CET21:52:39

2011A&A...527A..88V - Astronomy and Astrophysics, volume 527A, 88-88 (2011/3-1)

Chemistry in infrared dark clouds.

VASYUNINA T., LINZ H., HENNING T., ZINCHENKO I., BEUTHER H. and VORONKOV M.

Abstract (from CDS):

Massive stars play an important role in shaping the structure of galaxies. Infrared dark clouds (IRDCs), with their low temperatures and high densities, have been identified as the potential birthplaces of massive stars. In order to understand the formation processes of massive stars, the physical and chemical conditions in infrared dark clouds have to be characterized. The goal of this paper is to investigate the chemical composition of a sample of southern infrared dark clouds. One important aspect of the observations is to check, whether the molecular abundances in IRDCs are similar to the low-mass pre-stellar cores, or if they show signatures of more evolved evolutionary stages. We performed observations toward 15 IRDCs in the frequency range between 86 and 93GHz using the 22-m Mopra radio telescope. In total, 13 molecular species comprising N2H+, 13CS, CH3CN, HC3N, HNC, HCO+, HCN, HNCO, C2H, SiO, H13CO+, H13CN, and CH3C2H were observed for all targets. Hence, we included in general species appropriate for elevated densities, where some of them trace the more quiescent gas, while others are sensitive to more dynamical processes. We detect HNC, HCO+, and HNC emission in all clouds and N2H+ in all IRDCs except one. In some clouds we detect SiO emission. Complicated shapes of the HCO+ emission line profile are found in all IRDCs. Both signatures indicate infall and outflow motions and the beginning of star-formation activity, at least in some parts of the IRDCs. Where possible, we calculate molecular abundances and make a comparison with previously obtained values for low-mass pre-stellar cores and high-mass protostellar objects (HMPOs). We show a tendency for IRDCs to have molecular abundances similar to low-mass pre-stellar cores rather than to HMPOs abundances on the scale of our single-dish observations.

Abstract Copyright:

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

VizieR on-line data: <Available at CDS (J/A+A/527/A88): sources.dat spectra_fits/* spectra_mopra/*>

Nomenclature: Table 1, col(1): [VLH2011] IRDC GLLL.ll-N N=37.

Simbad objects: 62

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Number of rows : 62

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 Barnard 1 MoC 03 33 16.3 +31 07 51           ~ 251 0
2 [HKM99] B1-b cor 03 33 20.32 +31 07 21.5           ~ 151 0
3 TMC-1 MoC 04 41 45.9 +25 41 27           ~ 1333 0
4 LDN 1512 MoC 05 04 09.7 +32 43 09           ~ 159 0
5 LDN 1544 DNe 05 04 16.6 +25 10 48           ~ 661 0
6 NAME [BM89] L1544 cor 05 04 22.5 +25 11 36           ~ 434 1
7 NAME ORI MOL CLOUD MoC 05 56 -01.8           ~ 826 1
8 GAL 305.20+00.2 HII 13 11 35.1 -62 33 26           ~ 35 0
9 [VLH2011] IRDC G308.13-2 cor 13 37 00.418 -62 43 41.01           ~ 1 0
10 SDC G308.123-0.332 DNe 13 37 00.93 -62 44 38.8           ~ 4 0
11 [VLH2009] 308.12-0.33 DNe 13 37 01.2 -62 44 40           ~ 2 0
12 [VLH2011] IRDC G308.13-3 cor 13 37 02.163 -62 43 39.01           ~ 1 0
13 SDC G309.129-0.144 DNe 13 45 16.46 -62 21 58.8           ~ 5 0
14 AGAL G309.118-00.204 Y*O 13 45 16.775 -62 25 37.25           ~ 9 0
15 AGAL G309.129-00.144 cor 13 45 17.521 -62 22 02.84           ~ 4 0
16 [VLH2011] IRDC G309.13-2 cor 13 45 22.610 -62 23 27.48           ~ 5 0
17 AGAL G309.336-00.644 Y*O 13 47 56.15 -62 48 39.4           ~ 7 0
18 AGAL G309.421-00.621 cor 13 48 38.532 -62 46 17.55           ~ 9 0
19 [VLH2009] 309.34-0.64 DNe 13 48 39.8 -62 47 26           ~ 2 0
20 [VLH2011] IRDC G309.37-3 cor 13 48 39.86 -62 47 23.0           ~ 6 0
21 AGAL G309.911+00.324 Y*O 13 50 54.970 -61 44 21.00           ~ 9 0
22 IRAS 13524-6159 cor 13 56 00.68544 -62 13 58.6416           ~ 4 0
23 AGAL G310.374-00.304 Y*O 13 56 01.359 -62 14 18.29           ~ 9 0
24 [VLH2009] 310.39-0.28 DNe 13 56 01.7 -62 14 27           ~ 2 0
25 SDC G312.332-0.086 DNe 14 11 28.74 -61 29 19.9           ~ 4 0
26 [VLH2009] 312.33-0.07 DNe 14 11 56.8 -61 29 25           ~ 2 0
27 SDC G312.385-0.104 DNe 14 11 56.82 -61 29 24.4           ~ 4 0
28 MSXDC G313.70-0.31 b cor 14 22 53.158 -61 14 41.00           ~ 3 0
29 MSXDC G313.70-0.31 a cor 14 22 57.151 -61 14 10.84           ~ 3 0
30 AGAL G313.726-00.291 Y*O 14 23 02.720 -61 13 39.64           ~ 4 0
31 [VLH2011] IRDC G313.72-4 cor 14 23 05.39 -61 14 48.5           ~ 5 0
32 [VLH2009] 313.72-0.29 DNe 14 26 05.4 -61 14 48           ~ 2 0
33 MSXDC G316.73+0.07 a cor 14 44 15.400 -59 43 20.00           ~ 3 0
34 AGAL G316.719+00.076 cor 14 44 19.000 -59 44 29.00           ~ 10 0
35 [VLH2011] IRDC G316.45-2 cor 14 44 47.095 -60 31 30.89           ~ 1 0
36 [VLH2009] 316.45-0.66 DNe 14 44 50.4 -60 30 54           ~ 2 0
37 AGAL G316.451-00.654 Y*O 14 44 51.515 -60 30 55.00           ~ 8 0
38 AGAL G316.764-00.012 Y*O 14 44 56.000 -59 48 08.00           ~ 7 0
39 AGAL G316.768-00.026 Y*O 14 45 00.500 -59 48 44.00           ~ 9 0
40 AGAL G317.699+00.124 Y*O 14 51 07.43 -59 16 10.5           ~ 11 0
41 [VLH2009] 317.71+0.11 DNe 14 51 07.5 -59 16 11           ~ 2 0
42 MMB G317.701+00.110 cor 14 51 11.69 -59 17 02.1           ~ 12 0
43 AGAL G317.712+00.092 Y*O 14 51 19.667 -59 17 43.77           ~ 7 0
44 AGAL G318.153-00.341 Y*O 14 55 57.704 -59 29 04.12           ~ 3 0
45 [VLH2009] 318.13-0.34 DNe 14 55 58.4 -59 28 31           ~ 2 0
46 SDC G318.157-0.335 DNe 14 55 58.53 -59 28 29.3           ~ 4 0
47 SDC G320.234+0.331 DNe 15 07 32.50 -57 53 36.2           ~ 5 0
48 [VLH2011] IRDC G320.27-3 cor 15 07 35.077 -57 54 13.98           ~ 1 0
49 AGAL G320.271+00.292 Y*O 15 07 55.62 -57 54 29.7           ~ 11 0
50 [VLH2009] 320.23+0.32 DNe 15 07 56.7 -57 54 27           ~ 3 0
51 [PLW2012] G321.712+00.065-032.3 cor 15 18 01.065 -57 21 24.48           ~ 3 0
52 SSTGLMC G321.7075+00.0592 Y*O 15 18 01.7 -57 22 07           ~ 9 0
53 AGAL G321.756+00.031 Y*O 15 18 26.387 -57 22 00.14           ~ 15 0
54 [VLH2009] 321.71+0.07 DNe 15 18 26.7 -57 21 56           ~ 4 0
55 LDN 183 MoC 15 54 12.2 -02 49 42           ~ 675 1
56 LDN 63 DNe 16 50 15.5 -18 06 06           ~ 74 0
57 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1871 1
58 AGAL G013.839-00.487 cor 18 17 20.3041 -17 09 33.345           ~ 14 0
59 [VLH2009] 13.84-0.49 DNe 18 17 21.2 -17 09 23           ~ 2 0
60 [VLH2011] IRDC G013.90-1 cor 18 17 33.378 -17 06 36.70           ~ 3 0
61 NAME Galactic Molecular Ring PoG ~ ~           ~ 38 0
62 NAME Centaurus Arm PoG ~ ~           ~ 71 0

    Equat.    Gal    SGal    Ecl

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2020.01.26-21:52:39

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