CARMA M51 Project: Dynamically-Driven ISM Evolution

Details CARMA M51 Project: Dynamically-Driven ISM Evolution CARMA M51 Project: Dynamically-Driven ISM Evolution

Dec 2007

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2007aas...21115304k&link_type=abstract

American Astronomical Society, AAS Meeting #211, #153.04; Bulletin of the American Astronomical Society, Vol. 39, p.1005

Astronomy and Astrophysics

Astronomy

Scientific paper

The entire M51 disk is observed in CO(1-0) line with the CARMA interferometer and Nobeyama 45m telescope. With the unprecedented high image fidelity and spatial resolution, we detect many giant molecular clouds (GMCs) both on spiral arms and in interarm regions. Associations of giant molecular clouds (GMAs) are found only on spiral arms, and thus, they are unbound, short-lived structures. Molecular gas fraction is high even in interarm regions. Therefore, the GMA destruction is not caused by stellar feedback, which is likely to destroy molecules as well as GMAs and GMCs. We will discuss dynamically-driven ISM evolution -- strong shear motions in spiral arms cause GMA destruction and trigger ISM evolution.

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