1207.6634 (Moein Mosleh et al.)

The Evolution of Mass-size Relation for Lyman Break Galaxies From z=1 to z=7    [PDF]

Moein Mosleh, Rik J. Williams, Marijn Franx, Valentino Gonzalez, Rychard J. Bouwens, Pascal Oesch, Ivo Labbe, Garth D. Illingworth, Michele Trenti

For the first time, we study the evolution of the stellar mass-size relation for star-forming galaxies from z ~ 4 to z ~ 7 from Hubble-WFC3/IR camera observations of the HUDF and Early Release Science (ERS) field. The sizes are measured by determining the best fit model to galaxy images in the rest-frame 2100 \AA \ with the stellar masses estimated from SED fitting to rest-frame optical (from Spitzer/IRAC) and UV fluxes. We show that the stellar mass-size relation of Lyman-break galaxies (LBGs) persists, at least to z ~ 5, and the median size of LBGs at a given stellar mass increases towards lower redshifts. For galaxies with stellar masses of 9.5View original: http://arxiv.org/abs/1207.6634