Mathematics – Logic
Scientific paper
Jan 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009aas...21342312h&link_type=abstract
American Astronomical Society, AAS Meeting #213, #423.12; Bulletin of the American Astronomical Society, Vol. 41, p.244
Mathematics
Logic
Scientific paper
We demonstrate the necessity of observational constraints on stellar feedbacks in theoretical point of view and present recent observational studies about the stellar feedback effects on four local starburst galaxies. First, we show the effects of different stellar feedback models on the kinematics of Damped Lyman alpha Absorbers(DLAs) in cosmological simulations. This study suggests that the mometum-driven wind scenario suggested by Oppenheimer and Dave (2006) is a better model to explain the kinematics of DLAs than the constant wind scenario suggested by Springel and Hernquest (2003). But both of them are poorly constrained by observation -- they are mainly based on simply model calculations.
To improve stellar feedback model further, we need concrete observational constraints on the feedbacks. As a first step of founding the constraints, we present the small- and intermediate-scale structure of the Interstellar medium(ISM) ionized by nonradiative process for the four starburst galaxies, NGC1569, NGC4449, Holmberg II, and HE2-10, imaged with the Wide Field Planetary Camera 2 (WFPC2) and the Advanced Camera for Surveys(ACS) of the Hubble Space Telescope(HST). Those galaxies are resolved in parsec scale and can be analyzed by diagnostics diagram from H_alpha, H_beta, [NII](or[SII]), and [OIII] images. The nonradiative ionization is generally caused by shocks driven by stellar feedbacks. The theoretical energy deposited by star formation is calculated by STARBURST99 and compared with the observed shock energy to derive the efficiency of stellar feedback energy transported out to surrounding ISM. Finally we discuss about the future works with a larger sample.
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