Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20919906k&link_type=abstract
2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #199.06; Bulletin of the American Astronomical Society,
Astronomy and Astrophysics
Astronomy
Scientific paper
Despite numerous observational and theoretical studies, the nature of interstellar medium (ISM) gas dynamics remains uncertain. The dynamical response of the gas depends significantly on whether the ISM is a continuous hydrodynamic fluid or a set of discrete molecular clouds. The hydrodynamic fluid produces shocks along spiral arms or bars in galaxies, while the molecular clouds could ballistically pass the spiral/bar structures without encountering a shock. Such differences must change not only the dynamical response of the gas (e.g. shock, dissipation), but also the evolution timescale (e.g. gas inflow) and star formation. Continuous hydrodynamic models are often discussed to reproduce the narrow gas/dust lanes observed in barred galaxies; however, we demonstrate that an alternative scenario, cloud-based gas dynamics, also reproduces the narrow gas distribution and associated gas kinematics in bars. We compare the cloud-based gas dynamics model with CO observations of the barred galaxy NGC 4303 (M61). The cloud-based model better explains the distribution of young stellar clusters revealed in HST images as well as the observed velocity structure.
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