Evolution of stellar disk truncations since z=1

Details Evolution of stellar disk truncations since z=1 Evolution of stellar disk truncations since z=1

2008-07-26

arxiv.org/abs/0807.4237v1

Astronomy and Astrophysics

Astrophysics

6 pages, 4 figures, Proceedings of IAU Symposium 254 "The Galaxy Disk in a Cosmological Context"

Scientific paper

We present our recent results on the cosmic evolution of the outskirst 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 redshift 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.

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