The Evolution of Disk Galaxies Since z=1

Details The Evolution of Disk Galaxies Since z=1 The Evolution of Disk Galaxies Since z=1

2006-11-10

arxiv.org/abs/astro-ph/0611326v1

Astronomy and Astrophysics

Astrophysics

To appear in the ASP Conference Series (proceedings of the Cosmic Frontiers conference held in Durham, 31st July - 4th August

Scientific paper

Based on VLT/FORS spectroscopy and HST/ACS imaging, we have constructed a sample of ~200 field spiral galaxies that cover redshifts up to z~1. Such a large data set allows to study the evolution of fundamental galaxy parameters like luminosity, size, mass, mass-to-light ratio etc. as a function of cosmic time and in various mass regimes. Several of our findings - like the time-independent fraction of stellar-to-total mass - are in compliance with a hierarchical structure growth. However, the stellar population properties of intermediate-redshift disks favour a down-sizing scenario in the sense that the average stellar ages in high-mass spirals are older than in low-mass spirals.

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