VLA-ANGST: The Influence of Stellar Populations on the HI Shapes and Gas Dynamics in Galaxies

Details VLA-ANGST: The Influence of Stellar Populations on the HI Shapes and Gas Dynamics in Galaxies VLA-ANGST: The Influence of Stellar Populations on the HI Shapes and Gas Dynamics in Galaxies

Jan 2012

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21910607o&link_type=abstract

American Astronomical Society, AAS Meeting #219, #106.07

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Star formation has a profound impact in the interstellar medium, in the form of radiation and mechanical energy mainly originating from massive stars. In turn, the ISM properties determine where and how strong star formation takes place. This gas-star formation interplay is thus an important driver that regulates galaxy-wide star formation and therefore the evolution of galaxies. The "ACS Nearby Galaxy Survey Treasury" (ANGST) survey aims to study the resolved, stellar population of a volume limited sample of nearby galaxies with the resolving power and sensitivity of the HST. Major data products include spatially resolved maps of star formation as a function of look-back time (typically up to 500 Myr). The HI counterparts are studied with the large VLA follow up survey VLA-ANGST. We present morphologic and kinematic studies of the HI as a function of the underlying stellar population. This includes the gas velocity dispersion that may be driven by the mechanical energy deposited by the massive stars, as well as the larger scale morphologies in the form of bubbles, shells and rings. We find that stars at the location of HI features do fulfill the energy requirements needed to reshape the ISM by more than an order of magnitude over the timespan set by their individual dynamical ages. On smaller scales of individual stars, the direct impact on the gas properties is less obvious, suggesting that the spatial distribution of velocity dispersions is the combined result of star formation over hundreds of Myrs.

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