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The evolution of galaxy sizes

Published online by Cambridge University Press:  17 July 2013

Bianca M. Poggianti ,
Rosa Calvi ,
Daniele Bindoni ,
Mauro D'Onofrio ,
Alessia Moretti ,
Tiziano Valentinuzzi ,
Giovanni Fasano ,
Jacopo Fritz ,
Gabriella De Lucia  and
Benedetta Vulcani
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Bianca M. Poggianti
Affiliation:
INAF-Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, 35122Padova, Italy email: [email protected]
Rosa Calvi
Affiliation:
Department of Astronomy, University of Padova
Daniele Bindoni
Affiliation:
Department of Astronomy, University of Padova
Mauro D'Onofrio
Affiliation:
Department of Astronomy, University of Padova
Alessia Moretti
Affiliation:
Department of Astronomy, University of Padova
Tiziano Valentinuzzi
Affiliation:
INAF-Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, 35122Padova, Italy email: [email protected]
Giovanni Fasano
Affiliation:
INAF-Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, 35122Padova, Italy email: [email protected]
Jacopo Fritz
Affiliation:
Sterrenkundig Observatorium, University of Gent, Belgium
Gabriella De Lucia
Affiliation:
INAF-Astronomical Observatory of Trieste
Benedetta Vulcani
Affiliation:
Department of Astronomy, University of Padova
Daniela Bettoni
Affiliation:
INAF-Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, 35122Padova, Italy email: [email protected]
Marco Gullieuszik
Affiliation:
INAF-Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, 35122Padova, Italy email: [email protected]
Alessandro Omizzolo
Affiliation:
INAF-Astronomical Observatory of Padova, vicolo dell'Osservatorio 5, 35122Padova, Italy email: [email protected]
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Abstract

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We present a study of galaxy sizes in the local Universe as a function of galaxy environment, comparing clusters and the general field. Galaxies with radii and masses comparable to high-z massive and compact galaxies represent 4.4% of all galaxies more massive than 3 × 1010M⊙ in the field. Such galaxies are 3 times more frequent in clusters than in the field. Most of them are early-type galaxies with intermediate to old stellar populations. There is a trend of smaller radii for older luminosity-weighted ages at fixed galaxy mass. We show the relation between size and luminosity-weighted age for galaxies of different stellar masses and in different environments. We compare with high-z data to quantify the evolution of galaxy sizes. We find that, once the progenitor bias due to the relation between galaxy size and stellar age is removed, the average amount of size evolution of individual galaxies between high- and low-z is mild, of the order of a factor 1.6.

Keywords

galaxies: evolution — galaxies: structure — galaxies: fundamental parameters
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 8 , Symposium S295: The intriguing life of massive galaxies , August 2012 , pp. 151 - 154
Copyright
Copyright © International Astronomical Union 2013 

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