Photon Dominated Chemistry in the Nucleus of M82: Detection of HOC+ in a Starburst Galaxy

Details Photon Dominated Chemistry in the Nucleus of M82: Detection of HOC+ in a Starburst Galaxy Photon Dominated Chemistry in the Nucleus of M82: Detection of HOC+ in a Starburst Galaxy

Aug 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aipc..783..165f&link_type=abstract

THE EVOLUTION OF STARBURSTS: The 331st Wilhelm and Else Heraeus Seminar. AIP Conference Proceedings, Volume 783, pp. 165-170 (2

Computer Science

Galaxies, Interstellar Matter, Gases, Photons, Galactic Nuclei, Starburst Galaxies And Infrared Excess Galaxies, Atomic, Molecular, Chemical, And Grain Processes, Chemical Composition And Chemical Evolution, Galactic Nuclei, Circumnuclear Matter, And Bulges

Scientific paper

The nucleus of M82 has been mapped in 3mm and 1mm lines of CN, HCN, C2H, c-C3H2, CH3C2H, HC3N and 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+ abundance ratio unambiguously shows that the chemistry of the molecular gas reservoir in the nucleus of M82 is determined by the intense interstellar 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).

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