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The build-up of the outskirts of distant star-forming galaxies at z ~ 2

Published online by Cambridge University Press:  21 March 2017

Sandro Tacchella ,
C. Marcella Carollo ,
Avishai Dekel ,
Natascha Förster Schreiber ,
Alvio Renzini  and
zC-SINF Team
Sandro Tacchella
Affiliation:
Institute of Astronomy, ETH Zurich, CH-8093 Zurich, Switzerland email: sandro.tacchella@phys.ethz.ch
C. Marcella Carollo
Affiliation:
Institute of Astronomy, ETH Zurich, CH-8093 Zurich, Switzerland email: sandro.tacchella@phys.ethz.ch
Avishai Dekel
Affiliation:
Racah Institute of Physics, The Hebrew University, Jerusalem 91904, Israel
Natascha Förster Schreiber
Affiliation:
Max Planck Institut für Extraterrestrische Physik, D-85741, Garching, Germany
Alvio Renzini
Affiliation:
INAF Osservatorio Astronomico di Padova, vicolo dell’Osservatorio 5, I-35122 Padova, Italy
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Abstract

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In order to constrain – and understand – the growth of galaxies, we present a sample of ~ 30 galaxies at z ~ 2 with resolved distribution of stellar mass, star-formation rate, and dust attenuation on scales of ~ 1 kpc. We find that low- and intermediate-mass galaxies grow self-similarly, doubling their stellar mass in the centers and outskirts with the same pace. More massive galaxies (~ 1011 M⊙) have a reduced star-formation activity in their center: they grow mostly in the outskirts (inside-out quenching / formation). Similar trends are find in cosmological zoom-in simulations, highlighting that high stellar mass densities are formed in a gas-rich compaction phase. This nuclear ‘starburst’ phase is followed by a suppressed star-formation activity in the center, resulting in growth of the outskirts. All in all, we put forward that we witness at z ~ 2 the dissipative formation of z = 0 M* early-type galaxies.

Keywords

galaxies: bulgesgalaxies: elliptical and lenticularcDgalaxies: evolutiongalaxies: formationgalaxies: fundamental parametersgalaxies: high-redshiftgalaxies: structure
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 11 , Symposium S321: Formation and Evolution of Galaxy Outskirts , March 2016 , pp. 327 - 329
Copyright
Copyright © International Astronomical Union 2017 

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