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Modelling the supernova-driven ISM in different environments

Gatto, A. ; Walch, S. ; Low, M.-M. Mac ; Naab, T. ; Girichidis, P. ; Glover, S. C. O. ; Wünsch, R. ; Klessen, R. S. ; Clark, P. C. ; Baczynski, C. ; Peters, T. ; Ostriker, J. P. ; Ibáñez-Mejía, J. C. ; Haid, S.

In: Monthly Notices of the Royal Astronomical Society, 2015, vol. 449, no. 1, p. 1057-1075

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    Titre
    • Modelling the supernova-driven ISM in different environments
    Auteur
    • Gatto, A.. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching, Germany
    • Walch, S.. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching, Germany
    • Low, M.-M. Mac. Department of Astrophysics, American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, USA
    • Naab, T.. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching, Germany
    • Girichidis, P.. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching, Germany
    • Glover, S. C. O.. Institut für Theoretische Astrophysik, Zentrum für Astronomie, Universität Heidelberg, Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
    • Wünsch, R.. Astronomický Ústav, Akademie věd České Republiky, Boční II 1401, CZ-14131 Praha, Czech Republic
    • Klessen, R. S.. Institut für Theoretische Astrophysik, Zentrum für Astronomie, Universität Heidelberg, Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
    • Clark, P. C.. Institut für Theoretische Astrophysik, Zentrum für Astronomie, Universität Heidelberg, Albert-Ueberle-Str. 2, D-69120 Heidelberg, Germany
    • Baczynski, C.. Department of Astrophysics, American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, USA
    • Peters, T.. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Strasse 1, D-85748 Garching, Germany
    • Ostriker, J. P.. Department of Astrophysical Sciences, Princeton University, 4 Ivy Ln, Princeton, NJ 08544, USA
    • Ibáñez-Mejía, J. C.. Department of Astrophysics, American Museum of Natural History, 79th Street at Central Park West, New York, NY 10024, USA
    • Haid, S.. Physikalisches Institut, Universität Köln, Zülpicher Strasse 77, D-50937Köln, Germany
    Type de document
    • Postprint
    Langue
    • Inglese
    Publié dans
    • Monthly Notices of the Royal Astronomical Society, 2015, vol. 449, no. 1, p. 1057-1075. Oxford University Press
    Autre version électronique
    Identifiant OAI-PMH
    • oai:doc.rero.ch:293282
    Summary
    We use hydrodynamical simulations in a (256 pc)3 periodic box to model the impact of supernova (SN) explosions on the multiphase interstellar medium (ISM) for initial densities n=0.5-30cm−3 and SN rates 1-720Myr−1. We include radiative cooling, diffuse heating, and the formation of molecular gas using a chemical network. The SNe explode either at random positions, at density peaks, or both. We further present a model combining thermal energy for resolved and momentum input for unresolved SNe. Random driving at high SN rates results in hot gas (T≳106K) filling >90 per cent of the volume. This gas reaches high pressures (104

    50 per cent), residing in small, dense clumps. Such a model might resemble the dense ISM in high-redshift galaxies. Peak driving results in huge radiative losses, producing a filamentary ISM with virtually no hot gas, and a small molecular hydrogen mass fraction (≪1 per cent). Varying the ratio of peak to random SNe yields ISM properties in between the two extremes, with a sharp transition for equal contributions. The velocity dispersion in H i remains≲10 km s−1 in all cases. For peak driving, the velocity dispersion in Hα can be as high as 70 km s−1 due to the contribution from young, embedded SN remnants