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Galaxy Interactions, Star Formation History, and Bulgeless Galaxies

Published online by Cambridge University Press:  01 June 2008

Shardha Jogee
Shardha Jogee*
Affiliation:
Department of Astronomy, University of Texas at Austin, 1 University Station C1400, Austin, TX 78712-0259 email: sj@astro.as.utexas.edu
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Abstract

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Hierarchical ΛCDM models provide a successful paradigm for the growth of dark matter on large scales, but they face important challenges in predicting how the baryonic components of galaxies evolve. I present constraints on two aspects of this evolution: (1) The interaction history of galaxies over the last 7 Gyr and the impact of interactions on their star formation properties, based on Jogee et al. (2008a, b); (2) Constraints on the origin of bulges in hierarchical models and the challenge posed in accounting for galaxies with low bulge-to-total ratios, based on Weinzirl, Jogee, Khochar, Burkert, & Kormendy (2008, hereafter WJKBK08).

Keywords

galaxies: evolutiongalaxies: interactionsgalaxies: structuregalaxies: bulge

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