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Title:
The Localized Interplay Between Star Formation and Gas Chemistry in Nearby Starburst Galaxies
Authors:
Meier, D. S.; Turner, J. L.; Beck, S. C.
Publication:
The Evolving ISM in the Milky Way and Nearby Galaxies, The Fourth Spitzer Science Center Conference, Proceedings of the conference held December 2-5, 2007 at the Hilton Hotel, Pasadena, CA, Eds.: K. Sheth, A. Noriega-Crespo, J. Ingalls, and R. Paladini, Published online at http://ssc.spitzer.caltech.edu/mtgs/ismevol/
Publication Date:
01/2009
Origin:
AUTHOR
Keywords:
galaxies: ISM , infrared: ISM , ISM: molecules , galaxies: individual (IC 342, Maffei 2)
Bibliographic Code:
2009eimw.confE..42M

Abstract

We discuss high resolution (˜25-75 pc) imaging of the nuclear chemistry in the IR bright, nearby spirals, IC 342 and Maffei 2. Attention is focused on comparing molecular gas PDR and shock tracers, C2H and CH3OH, respectively, with the MIR PAHs, H2 and atomic spectral features. C2H is found to be a privileged tracer of the locations of PDRs. In IC 342 the PDRs are highly confined (˜50 pc scales), but less so in Maffei 2. In both nuclei the morphology of the mid infrared PAH emission is tightly correlated with the C2H. Grain species like CH3OH are common in spiral nuclei, but their locations do not correlate with embedded star formation and its interactions with the molecular gas. They originate, instead, at the locations of orbital resonances in the nuclear potential. The distribution of warm H2 in IC 342 correlates better with the shocks traced by methanol emission than with PDRs. In Maffei 2 the PDR heating is favored for H2.
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