Edge-on Galaxies in the Hubble Ultra Deep Field

We have produced a sample of 58 edge-on spiral galaxies at redshifts z similar to 1 selected in the Hubble Ultra Deep Field. For all galaxies we have analyzed the 2D brightness distributions in the V-606 and i(775) filters and measured the radial (h(r)) and vertical (h(z)) exponential scale lengths of the brightness distribution. We have obtained evidence that the relative thickness of the disks of distant galaxies, i.e., the ratio of the vertical and radial scale lengths, on average, exceeds the relative thickness of the disks of nearby spiral galaxies. The vertical scale length h(z) of the stellar disks of galaxies shows no big changes at z = 1. The possibility of the evolution of the radial scale length h(z) for the brightness distribution with redshift is discussed.