The axis ratio distribution of local and distant galaxies

Surface photometry from 16 HST/WFPC2 fields in the I₈₁₄ -band filter is used to derive the distribution of apparent axis ratios for galaxies in progressively fainter magnitude intervals for I₈₁₄ ≤ 25. We assess the systematic and accidental errors in ellipticity measurements as a function of image resolution and signal-to-noise ratio, and statistically correct for the effect of cosmological surface brightness dimming on our isophotal measurements. The axis ratio distribution for the local galaxy population was computed using log R₂₅ measurements for 1569 RC3 galaxies with B_T ≤ 13 mag. Nonparametric tests are used to show that our distant samples, in the redshift range 0.1 ≲ z ≲ 1.0-1.5, are not statistically different from the local sample. We present image montages of galaxies selected randomly from different axis ratio and apparent magnitude ranges and discuss the evolutionary consequences of the lack of a strong difference between the ellipticity distributions in near and far data sets.