Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001apj...547..172w&link_type=abstract
The Astrophysical Journal, Volume 547, Issue 1, pp. 172-186.
Astronomy and Astrophysics
Astronomy
183
Galaxies: Structure, Ism: Kinematics And Dynamics, Ism: Structure, Methods: Numerical
Scientific paper
High-resolution two-dimensional hydrodynamic simulations for the interstellar matter (ISM) in a galactic disk are enhanced to include explicitly star formation and the feedback effects from supernovae and stellar winds. A globally stable multiphase ISM is formed, in which filamentary and clumpy structure is a characteristic feature. We find a new component of 106-108 K gas that is a direct consequence of the energy input from the feedback. The total supernovae rate in the system varies by an order of magnitude over a timescale of 106 yr. The evolution of the supernovae rate exhibits chaotic behavior because the star formation is triggered by supernovae explosions in the inhomogeneous interstellar medium. We also find that, in spite of its very complicated spatial structure, the multiphase ISM exhibits a one-point probability density function (pdf) that is a perfect lognormal distribution over four decades in density, 102-106 Msolar pc-2. The lognormal pdf is very robust even in regions with frequent bursts of supernovae. Low-density regions or cavities (<10 Msolar pc-2), on the other hand, exhibit the normal Gaussian distribution. These characteristic pdf's are achieved over a local dynamical scale. The energy spectra are E(k)~k-3 without feedback and E(k)~k-2 including stellar energy feedback.
Norman Colin A.
Wada Keiichi
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