Although samples are still fairly small, very interesting results have been obtained, and HST imaging offers the exciting possibility of determining the morphology of the galaxies responsible for the faint galaxy excess.
Axial ratio is the simplest morphological parameter to measure.
The counts showed that the galaxy mix at faint magnitudes differs from our local neighborhood. The counts could also be matched with the Marzke et al. This is five times the Loveday et al. loveday92 normalization, and it is inconsistent with faint redshift surveys as it predicts too many low-redshift objects. This increase in rest-frame surface brightness indicates that galactic disks undergo strong evolution at those redshifts, probably as a result of global star formation. The work of Schade et al.