Resolving the Connection Between Dense Gas Properties and Star Formation in Maffei 2

Details Resolving the Connection Between Dense Gas Properties and Star Formation in Maffei 2 Resolving the Connection Between Dense Gas Properties and Star Formation in Maffei 2

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21942701m&link_type=abstract

American Astronomical Society, AAS Meeting #219, #427.01

Astronomy and Astrophysics

Astronomy

Scientific paper

The intimate connection between dense gas and star formation makes characterizing evolving dense gas properties of great importance to understanding the evolution of starbursts. We present high spatial resolution ( pc) imaging of ten dense gas probes towards the nucleus of Maffei 2. These astrochemical observations are compiled from the OVRO, BIMA and CARMA millimeter interferometers. Line ratios between dense gas tracers including HCN/HCO+, HCN/HNC and HCO+/N2H+ are compared with local star formation rate, gas density and chemistry. The HCN/HCO+ and HCO+/N2H+ line ratios exhibit strong giant molecular cloud scale variation. Small scale variation in the HCN/HNC ratio is not observed. The HCN/HCO+ line ratio poorly correlates with star formation, while elevated HCO+/N2H+ ratios correlate well with photon-dominated regions (PDRs). The use of HCO+/N2H+ as a PDR tracer in external galaxies is proposed and its distribution is compared with the lower density PDR tracer, C2H, to characterize PDR physical conditions. The impact of photodissociation on the morphology of shock tracers is discussed. Conclusions from Maffei 2 are compared with IC 342 and M 82 to further investigate changes in gas chemistry with starburst phase.
This work is supported by the National Science Foundation grant AST-1009620.

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