Molecules as tracers of galaxy evolution: an EMIR survey. I. Presentation of the data and first results

We investigate the molecular gas properties of a sample of 23 galaxies in order to find and test chemical signatures of galaxy evolution and to compare them to IR evolutionary tracers. Observation at 3 mm wavelengths were obtained with the EMIR broadband receiver, mounted on the IRAM 30 m telescope...

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Bibliographic Details
Published in:arXiv.org 2011-01
Main Authors: Costagliola, F, Aalto, S, Rodriguez, M I, Muller, S, Spoon, H W W, Martín, S, Peréz-Torres, M A, Alberdi, A, Lindberg, J E, Batejat, F, Jütte, E, van der Werf, P, Lahuis, F
Format: Article
Language:English
Subjects:
Active galactic nuclei
Broadband
Chemical evolution
Emission analysis
Evolution
Faint objects
Galactic evolution
Galaxies
Molecular gases
Object recognition
Organic chemistry
Principal components analysis
Stars & galaxies
Tracers
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Summary:We investigate the molecular gas properties of a sample of 23 galaxies in order to find and test chemical signatures of galaxy evolution and to compare them to IR evolutionary tracers. Observation at 3 mm wavelengths were obtained with the EMIR broadband receiver, mounted on the IRAM 30 m telescope on Pico Veleta, Spain. We compare the emission of the main molecular species with existing models of chemical evolution by means of line intensity ratios diagrams and principal component analysis. We detect molecular emission in 19 galaxies in two 8 GHz-wide bands centred at 88 and 112 GHz. The main detected transitions are the J=1-0 lines of CO, 13CO, HCN, HNC, HCO+, CN, and C2H. We also detect HC3N J=10-9 in the galaxies IRAS 17208, IC 860, NGC 4418, NGC 7771, and NGC 1068. The only HC3N detections are in objects with HCO+/HCN0.8). The brightest HC3N emission is found in IC 860, where we also detect the molecule in its vibrationally excited state.We find low HNC/HCN line ratios (
ISSN:2331-8422
DOI:10.48550/arxiv.1101.2122