Journal Article

Feedback and the formation of dwarf galaxy stellar haloes

G. S. Stinson, J. J. Dalcanton, T. Quinn, S. M. Gogarten, T. Kaufmann and J. Wadsley

in Monthly Notices of the Royal Astronomical Society

Published on behalf of The Royal Astronomical Society

Volume 395, issue 3, pages 1455-1466
Published in print May 2009 | ISSN: 0035-8711
Published online May 2009 | e-ISSN: 1365-2966 | DOI:
Feedback and the formation of dwarf galaxy stellar haloes

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Stellar population studies show that low-mass galaxies in all environments exhibit stellar haloes that are older and more spherically distributed than the main body of the galaxy. In some cases, there is a significant intermediate age component that extends beyond the young disc. We examine a suite of Smoothed Particle Hydrodynamic simulations and find that elevated early star formation activity combined with supernova feedback can produce an extended stellar distribution that resembles these haloes for model galaxies ranging from v200= 15 to 35 km s−1, without the need for accretion of subhaloes.

Keywords: methods: N-body simulations; galaxies: evolution; galaxies: formation

Journal Article.  8568 words.  Illustrated.

Subjects: Astronomy and Astrophysics

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