Detalles de publicación

PP 08008

Color Profiles of Disk Galaxies since z~1:Probeing outer disk formation scenarios

(1)Ruyman Azzollini (1) Ignacio Trujillo (1,2) John Beckman
(1) IAC. (2) CSIC
We present deep color profiles for a sample of 415 disk galaxies within the redshift range 0.1<z<~1.1, and contained in HSY-ACS imaging of the GOODS-South field (Giavalisco et al.,2004). For each galaxy, passband combinations are chosen to obtain, at each redshift, the best possible approximation to the restframe u-g color. We find that objects whcih show a truncation in their stellar disk (Type II objects), usually show a minimum in their color profile at the break, or very near to it, with a maximum to minimum amplitude of <~0.2mag/arcsec2, a feature which is
persisten throughout the explored range of redshifts, (i.e. in the last ~8 Gyr). This color structure is in qualitative agreement with recent model expectations (Roskar et al. 2008), where the break of the surface brightness profiles is the result of the interplay between a radial star formation cut-off and a redistribution of stellar mass by secular processes.

 
Aceptado para publicación en ApJL | Enviado el 2008-04-29 | Proyecto P3/86, 3E3707