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Scaling Relations of Dwarf Galaxies without Supernova-Driven Winds

Published online by Cambridge University Press:  01 June 2007

K. Tassis ,
A. V. Kravtsov  and
N. Y. Gnedin
K. Tassis
Affiliation:
Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637, USA The Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA
A. V. Kravtsov
Affiliation:
Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637, USA The Kavli Institute for Cosmological Physics, The University of Chicago, Chicago, IL 60637, USA Enrico Fermi Institute, The University of Chicago, Chicago, IL 60637, USA
N. Y. Gnedin
Affiliation:
Department of Astronomy and Astrophysics, The University of Chicago, Chicago, IL 60637, USA Particle Astrophysics Group, Fermilab, Batavia, IL 60510, USA
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Abstract

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Nearby dwarf galaxies exhibit tight correlations between their global stellar and dynamical properties, such as circular velocity, mass-to-light ratio, stellar mass, surface brightness, and metallicity. Such correlations have often been attributed to gas or metal-rich outflows driven by supernova energy feedback to the interstellar medium. We use high-resolution cosmological simulations of high-redshift galaxies with and without energy feedback, as well as analytic modeling, to investigate whether the observed correlations can arise without supernova-driven outflows. We find that the simulated dwarf galaxies exhibit correlations similar to those observed as early as z ≈ 10 and the addition of realistic levels of supernova energy feedback has no appreciable effect on these correlations. We also show that the correlations can be well reproduced by our analytic model that accounts for gas inflow but without outflows, and star formation rate obeying the Kennicutt-Schmidt law with a critical density threshold. We argue that correlations in simulated galaxies arise due to the increasingly inefficient conversion of gas into stars in low-mass dwarf galaxies rather than supernova-driven outflows.

Keywords

stars: formationgalaxies: formationcosmology: theory
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S244: Dark Galaxies and Lost Baryons , June 2007 , pp. 256 - 265
Copyright
Copyright © International Astronomical Union 2008

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