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Cosmic evolution of stellar disk truncations: from z = 1 to the Local Universe

Published online by Cambridge University Press:  01 June 2008

Ignacio Trujillo ,
Ruyman Azzollini ,
Judit Bakos ,
John Beckman  and
Michael Pohlen
Ignacio Trujillo
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, 38205 La Laguna, S/C de Tenerife, Spain email: trujillo@iac.es, ruyman@iac.es, jbakos@iac.es, jeb@iac.es
Ruyman Azzollini
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, 38205 La Laguna, S/C de Tenerife, Spain email: trujillo@iac.es, ruyman@iac.es, jbakos@iac.es, jeb@iac.es
Judit Bakos
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, 38205 La Laguna, S/C de Tenerife, Spain email: trujillo@iac.es, ruyman@iac.es, jbakos@iac.es, jeb@iac.es
John Beckman
Affiliation:
Instituto de Astrofísica de Canarias, C/Vía Láctea s/n, 38205 La Laguna, S/C de Tenerife, Spain email: trujillo@iac.es, ruyman@iac.es, jbakos@iac.es, jeb@iac.es
Michael Pohlen
Affiliation:
Cardiff University, School of Physics & Astronomy, Cardiff, CF24 3AA, Wales, UK email: Michael.Pohlen@astro.cf.ac.uk
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Abstract

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We present our recent results on the cosmic evolution of the outskirts of disk galaxies. In particular we focus on disk–like galaxies with stellar disk truncations. Using UDF, GOODS and SDSS data we show how the position of the break (i.e. a direct estimator of the size of the stellar disk) evolves with time since z~1. Our findings agree with an evolution on the radial position of the break by a factor of 1.3 ± 0.1 in the last 8 Gyr for galaxies with similar stellar masses. We also present radial color gradients and how they evolve with time. At all redshifts we find a radial inside-out bluing reaching a minimum at the position of the break radius, this minimum is followed by a reddening outwards. Our results constraint several galaxy disk formation models and favour a scenario where stars are formed inside the break radius and are relocated in the outskirts of galaxies through secular processes.

Keywords

galaxies: evolution - galaxies: high-redshift - galaxies: structure - galaxies: formation - galaxies: spiral - galaxies: photometry
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S254: The Galaxy Disk in Cosmological Context , June 2008 , pp. 127 - 132
Copyright
Copyright © International Astronomical Union 2009

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