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Environmental Effects on the ISM and Star Formation Properties of Nearby Spiral Galaxies

Part of: IAU Issue 315 - From Interstellar Clouds...

Published online by Cambridge University Press:  12 September 2016

Angus Mok  and
Christine Wilson
Angus Mok
Affiliation:
Dept. of Physics & Astronomy McMaster University, 1280 Main Street West, Hamilton, Canada email: mokakf@mcmaster.ca
Christine Wilson
Affiliation:
Dept. of Physics & Astronomy McMaster University, 1280 Main Street West, Hamilton, Canada email: wilson@physics.mcmaster.ca
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Abstract

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We studied molecular gas properties in a sample of 98 Hi - flux selected spiral galaxies within ~ 25 Mpc using the CO J = 3 − 2 line, observed with the JCMT, and subdivided into isolated, group, and Virgo subsamples. We find a larger mean H2 mass in the Virgo galaxies compared to group galaxies, despite their lower mean Hi mass. Combining our data with complementary Hα star formation rate measurements, Virgo galaxies have a longer molecular gas depletion times compared to group galaxies, perhaps due to heating processes in the cluster environment or differences in the turbulent pressure.

Keywords

galaxies: ISMgalaxies: spiralISM: moleculesstars: formation

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