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Assembly Histories and Observational Properties of Simulated Early-type Galaxies

Published online by Cambridge University Press:  17 July 2013

Peter H. Johansson
Peter H. Johansson*
Affiliation:
Department of Physics, University of Helsinki, Gustaf Hällströmin katu 2a, FI-00014 Helsinki, Finland email: Peter.Johansson@helsinki.fi
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Abstract

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We demonstrate that massive simulated galaxies assemble in two phases, with the initial growth dominated by compact in situ star formation, whereas the late growth is dominated by accretion of old stars formed in subunits outside the main galaxy. We also show that 1) gravitational feedback strongly suppresses late star formation in massive galaxies contributing to the observed galaxy colour bimodality that 2) the observed galaxy downsizing can be explained naturally in the two-phased model and finally that 3) the details of the assembly histories of massive galaxies are directly connected to their observed kinematic properties.

Keywords

galaxies: elliptical and lenticulargalaxies: formationgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 354 - 357
Copyright
Copyright © International Astronomical Union 2013 

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