IAU01322
Presentation type requested: ORAL
GEMS: THE EVOLUTION OF DISC SIZES OVER THE LAST 10 GYRS
Marco Barden
Max-Planck-Istitut f. Astronomie

Galaxy properties like the stellar luminosities, their SEDs and intrinsic spatial structures change dramatically depending on their individual star-formation, mass-aggregation or merger histories. In order to study these processes in unprecedented detail, we have taken the largest area deep image ever taken with the Hubble Space Telescope, a ~30'x30' ACS mosaic in the F606W and F850LP bands. Together with existing redshift information, we will unravel the evolution of more than 10,000 galaxies at 0.2<z<1.2. The standard picture of hierarchical galaxy formation predicts that galaxies should grow with time in both mass and size. Sersic fits to the light profiles of these 10,000 galaxies with known redshifts will provide us with concentration indices and scale sizes. In this talk we present our first results on the size evolution of galaxies over the last ~10 Gyrs and will compare our results with expectations from models for galaxy formation. Furthermore, we will present first estimates of the evolution of the morphological mix, focussing on the advent of large numbers of disc galaxies.

Haeussler Boris , Rix Hans-walter , Bell Eric , Borch Andrea , Meisenheimer Klaus , Beckwith Steven , Jogee Shardha , Somerville Rachel S, John Caldwell, Wisotzki Lutz, Jahnke Knud, Sanchez Sebastian. F, Wolf Christian, Peng Chien Y., McIntosh Daniel H.

IAU XXV General Assembly | IAU216 HOME PAGE | IAU216 Speaker Program | IAU216 Poster Program