Bulgeless dwarf galaxies and dark matter cores from supernova-driven outflows

F. Governato (), C. Brook, L. Mayer, A. Brooks, G. Rhee, J. Wadsley, P. Jonsson, B. Willman, G. Stinson, T. Quinn and P. Madau
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F. Governato: University of Washington, Seattle, Washington 98195, USA
C. Brook: Jeremiah Horrocks Institute, University of Central Lancashire, Preston, Lancashire, PR1 2HE, UK
L. Mayer: Institute for Theoretical Physics, University of Zurich, Winterthurestrasse 190, CH-8057 Zürich, Switzerland
A. Brooks: Theoretical Astrophysics, California Institute of Technology, MC 350-17, Pasadena, California 91125, USA
G. Rhee: University of Nevada, Las Vegas, Nevada 89154, USA
J. Wadsley: McMaster University, Hamilton, Ontario, L8S 4M1, Canada
P. Jonsson: Institute of Particle Physics,
B. Willman: Haverford College, 370 Lancaster Avenue, Haverford, Pennsylvania 19041, USA
G. Stinson: McMaster University, Hamilton, Ontario, L8S 4M1, Canada
T. Quinn: University of Washington, Seattle, Washington 98195, USA
P. Madau: University of California, Santa Cruz (UCSC), Santa Cruz, California 95064, USA

Nature, 2010, vol. 463, issue 7278, 203-206

Abstract: Fighting the galactic bulge Observations show most dwarf galaxies to be almost 'bulgeless', consisting of a rotating stellar disc embedded in a massive near-constant-density core halo of cold dark matter. This sits uncomfortably with the predictions of models based on the dominance of cold dark matter, which invariably generate galaxies with dense stellar spheroidal bulges and steep central dark-matter profiles, as low-angular-momentum baryons and dark matter sink to the centre of galaxies through accretion and repeated mergers. Governato et al. report hydrodynamical simulations that resolve this paradox. Strong outflows from supernovae remove low-angular-momentum gas, thereby inhibiting the formation of bulges and decreasing dark-matter density around the centre of the galaxy.

Date: 2010
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DOI: 10.1038/nature08640

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