Mapping Warm H2 in M51: Impacts of Global Galactic Dynamics on Molecular Clouds and Their Formation

Details Mapping Warm H2 in M51: Impacts of Global Galactic Dynamics on Molecular Clouds and Their Formation Mapping Warm H2 in M51: Impacts of Global Galactic Dynamics on Molecular Clouds and Their Formation

Mar 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008sptz.prop50407k&link_type=abstract

Spitzer Proposal ID #50407

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Scientific paper

We propose to investigate ISM evolution and turbulence driven by large-scale galactic dynamics, using the high spectral-resolution IRS (SH&LH) mapping of a large region (3.6x3.6kpc2) in M51. We will use three H2 lines, i.e. S(0), S(1), and S(2), as signposts of warm gas, local shocks, and turbulence. We will investigate their distributions in global galactic structures and dynamics. The proposed region covers two successive spiral arms and an interarm region in between; and therefore, we can trace the variations of ISM properties continuously along gas flows from one arm to the other. Our high-fidelity CO(J=1-0) map from the CARMA key science project complements this Spitzer project. We will correlate the ISM properties derived from Spitzer (e.g. temperature, surface density, and warm/cold gas fraction), with global and local gas dynamics and distribution traced with CARMA. From the variations of S(0), S(1), and S(2) line ratios over global scale, we will investigate the impacts of global galactic dynamics on interstellar turbulence, and on the formation and lifetime of molecular clouds.

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