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Understanding the size growth of massive galaxies through stellar populations

Published online by Cambridge University Press:  17 August 2016

I. Ferreras ,
I. Trujillo ,
E. Mármol-Queraltó ,
P. Pérez-González  and
the SHARDS team
I. Ferreras
Affiliation:
Mullard Space Science Laboratory, University College London, UK
I. Trujillo
Affiliation:
Instituto de Astrofísica de Canarias & Universidad de La Laguna, Spain
E. Mármol-Queraltó
Affiliation:
Institute for Astronomy, Royal Observatory, Edinburgh, UK
P. Pérez-González
Affiliation:
Departamento de Astrofísica, Universidad Complutense de Madrid, Spain email: [email protected]
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Abstract

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Massive early-type galaxies undergo a significant process of evolution with redshift on the stellar mass vs size plane. Furthermore, this trend does not depend on the age of their stellar populations. Therefore, such an evolution should involve processes that do not include a significant amount of star formation, leaving (mostly) dry mergers as the main growth channel. By studying close pairs involving a massive galaxy, one can quantify the role of mergers on the growth of massive galaxies. A recent study based on the SHARDS dataset reveals that minor mergers cannot be the dominant mechanism to explain the bulk of size growth in these systems. Merging is found to provide a constant fractional growth rate of ~10% per Gyr from redshift z=1, corresponding to an overall stellar mass increase of 2× between z=1 and z=0.

Keywords

galaxies:evolutiongalaxies:formation
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S319: Galaxies at High Redshift and Their Evolution Over Cosmic Time , August 2015 , pp. 114 - 117
Copyright
Copyright © International Astronomical Union 2016 

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