We report here the first evidence for stellar disk truncation at high redshift , based on surface photometry of a sample of 16 high redshift ( 0.6 < z ~ { } < 1.0 ) disk galaxies from the GOODS HST/ACS data .
The radial profiles are best fit by a double exponential profile .
This result agrees with the profile of disks in local galaxies .
The cosmological surface brightness dimming at this redshift range only allows us to detect galaxies with spatially “ early ” truncation , R _ { br } /h _ { in } \leqq 3.5 .
Six galaxies show the radial double exponential structure , with an average value of R _ { br } /h _ { in } \approx 1.8 .
Such “ early ” truncated galaxies are missing in local samples so far .
This result opens the ground for observing directly disk evolution through the study of the truncation radius as a function of redshift .