Stellar feedback in dwarf galaxy formation.

Stellar feedback in dwarf galaxy formation. Research Abstract Details 

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Stellar feedback in dwarf galaxy formation. Abstract Text:

Sergey Mashchenko,James Wadsley,H M P Couchman,Sergey Mashchenko,James Wadsley,H M P Couchman,

Dwarf galaxies pose substantial challenges for cosmological models. In particular, current models predict a dark-matter density that is divergent at the center, which is in sharp contrast with observations that indicate a core of roughly constant density. Energy feedback, from supernova explosions and stellar winds, has been proposed as a major factor shaping the evolution of dwarf galaxies. We present detailed cosmological simulations with sufficient resolution both to model the relevant physical processes and to directly assess the impact of stellar feedback on observable properties of dwarf galaxies. We show that feedback drives large-scale, bulk motions of the interstellar gas, resulting in substantial gravitational potential fluctuations and a consequent reduction in the central matter density, bringing the theoretical predictions in agreement with observations.

Stellar feedback in dwarf galaxy formation. Publishing Authors By Initials

S Mashchenko,J Wadsley,HM Couchman,S Mashchenko,J Wadsley,HM Couchman,

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Stellar feedback in dwarf galaxy formation. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Science (New York, N.Y.)

VOLUME: 319

Page Numbers: 174-7

Journal Abbreviation: Science

ISSN: 1095-9203

DAY: 29

MONTH: 11

YEAR: 2007

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LANGUAGE: eng

NlmUniqueID: 404511

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Grant and Affiliation Information for Stellar feedback in dwarf galaxy formation.

AFFILIATION: Department of Physics and Astronomy, McMaster University, Hamilton, ON L8S 4M1, Canada. syam@physics.mcmaster.ca

Country: United States

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MEDLINETA: Science

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