Computer Science
Scientific paper
Jan 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005esasp.577..281f&link_type=abstract
In: Proceedings of the dusty and molecular universe: a prelude to Herschel and ALMA, 27-29 October 2004, Paris, France. Ed. by A
Computer Science
Galaxies: Individual (M82), Galaxies: Nuclei, Galaxies: Starburst, Ism: Molecules, Ism: Abundances, Radio Lines: Galaxies
Scientific paper
The nucleus of M82 has been mapped in 3mm and 1mm lines of CN, HCN, C2H, c-C3H2, CH3C2H, HC3N and the HOC+ using the IRAM 30m telescope. These species have been selected for constituting a good diagnostic of photon-dominated chemistry. We have measured [CN]/[HCN] ratios ≥5 in the inner 650 pc galaxy disk. Furthermore, we have detected the HOC+ 1→0 line with an intensity similar to that of the H13CO+ 1→0 line. This implies a [HCO+]/[HOC+] ratio of ~40. This low [HCO+]/[HOC+] ratio shows that the chemistry of the molecular gas reservoir in the nucleus of M82 is heavily influenced by the intense UV flux (G0~104 in units of Habing field). Finally, the detection of the hydrocarbons c-C3H2 and CH3C2H in the nucleus of M82 suggests that a complex carbon chemistry is developing in this giant photo-dissociation region (PDR).
Fuente Asuncion
Garcia-Burillo Santiago
Gerin Maryvonne
Rizzo Ricardo J.
Teyssier David
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