The structural and size evolution of star-forming galaxies over the last 11 Gyr

We present new results on the evolution of rest-frame blue/UV sizes and Sersic indices of Ha-selected star-forming galaxies over the last 11 Gyr. We investigate how the perceived evolution can be affected by a range of biases and systematics such as cosmological dimming and resolution effects. We use galfit and an artificial redshifting technique, which includes the luminosity evolution of Ha-selected galaxies, to quantify the change on the measured structural parameters with redshift. We find typical sizes of 2-3 kpc and Sersic indices of n ~ 1.2, close to pure exponential discs all the way from z = 2.23 to z = 0.4. At z = 0, we find typical sizes of 4-5 kpc. Our results show that, when using galfit, cosmological dimming has a negligible impact on the derived effective radius for galaxies with