Cosmic evolution of stellar disk truncations: from z = 1 to the Local Universe
Abstract
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.
- Publication:
-
The Galaxy Disk in Cosmological Context
- Pub Date:
- March 2009
- DOI:
- 10.1017/S174392130802749X
- Bibcode:
- 2009IAUS..254..127T
- Keywords:
-
- galaxies: evolution - galaxies: high-redshift - galaxies: structure - galaxies: formation - galaxies: spiral - galaxies: photometry;
- galaxies: evolution;
- galaxies: high-redshift;
- galaxies: structure;
- galaxies: formation;
- galaxies: spiral;
- galaxies: photometry