2011A&A...535A..84A


C.D.S. - SIMBAD4 rel 1.7 - 2019.11.14CET09:02:44

2011A&A...535A..84A - Astronomy and Astrophysics, volume 535A, 84-84 (2011/11-1)

A λ = 1.3mm and 2mm molecular line survey towards M 82.

ALADRO R., MARTIN S., MARTIN-PINTADO J., MAUERSBERGER R., HENKEL C., OCANA FLAQUER B. and AMO-BALADRON M.A.

Abstract (from CDS):

We study the chemical complexity towards the central parts of the starburst galaxy M82, and investigate the role of certain molecules as tracers of the physical processes in the galaxy circumnuclear region. We carried out a spectral line survey with the IRAM-30 m telescope towards the northeastern molecular lobe of M82. It covers the frequency range between 129.8GHz and 175.0GHz in the 2mm atmospheric window, and between 241.0GHz and 260.0GHz in the 1.3mm atmospheric window. Sixty-nine spectral features corresponding to 18 different molecular species are identified. In addition, three hydrogen recombination lines are detected. The species NO, H2S, H2CS, NH2CN, and CH3CN are detected for the first time in this galaxy. Assuming local thermodynamic equilibrium, we determine the column densities of all the detected molecules. We also calculate upper limits to the column densities of fourteen other important, but undetected, molecules, such as SiO, HNCO, or OCS. We compare the chemical composition of the two starburst galaxies M82 and NGC253. This comparison enables us to establish the chemical differences between the products of the strong photon-dominated regions driving the heating in M82, and the large-scale shocks that influence the properties of the molecular clouds in the nucleus of NGC253. Overall, both sources have different chemical compositions. Some key molecules highlight the different physical processes dominating both central regions. Examples include CH3CCH, c-C3H2, or CO+, the abundances of which are clearly higher in M82 than in NGC253, pointing at photodissociating regions. On the other hand, species such as CH2NH, NS, SiO, and HOCO+ have abundances of up to one order of magnitude higher in NGC253 than in M82.

Abstract Copyright:

Journal keyword(s): ISM: molecules - galaxies: nuclei - galaxies: abundances - radio lines: ISM - galaxies: starburst - galaxies: individual: M82

Simbad objects: 13

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Number of rows : 13

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 NGC 253 SyG 00 47 33.134 -25 17 19.68   8.03   6.94 8.1 ~ 2862 2
2 IC 342 SBG 03 46 48.514 +68 05 45.98   10.5       ~ 1363 1
3 NAME Horsehead Nebula DNe 05 40 59.0 -02 27 30           ~ 430 0
4 M 81 Sy2 09 55 33.17306143 +69 03 55.0609270   7.89 6.94     ~ 3893 5
5 M 82 IG 09 55 52.430 +69 40 46.93 9.61 9.30 8.41     ~ 5221 6
6 NGC 4945 Sy2 13 05 27.279 -49 28 04.44   9.31 14.40 7.55   ~ 1231 2
7 M 83 SBG 13 37 00.919 -29 51 56.74 8.85 8.11 7.52 7.21   ~ 2164 2
8 IC 4553 SyG 15 34 57.22396 +23 30 11.6084   14.76 13.88     ~ 2624 4
9 NAME Sgr A* X 17 45 40.03599 -29 00 28.1699           ~ 3280 3
10 NAME Gal Center reg 17 45 40.04 -29 00 28.1           ~ 11039 0
11 NAME Sgr B2 MoC 17 47 20.4 -28 23 07           ~ 1856 1
12 NAME Sgr B2 Main Rad 17 47 20.5 -28 23 06           ~ 325 1
13 NGC 6946 H2G 20 34 52.332 +60 09 13.24   10.5       ~ 2184 2

    Equat.    Gal    SGal    Ecl

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2019.11.14-09:02:44

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