Volume 427, Number 3, December I 2004
|Page(s)||L17 - L20|
|Published online||16 November 2004|
Letter to the Editor
Truncation of stellar disks in galaxies at z ≈ 1*
Kapteyn Astronomical Institute, University of Groningen, Postbus 800, 9700AV Groningen, The Netherlands e-mail: email@example.com
Accepted: 9 October 2004
We report here the first evidence for stellar disk truncation at high redshift, based on surface photometry of a sample of 16 high redshift () 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, . Six galaxies show the radial double exponential structure, with an average value of . 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.
Key words: galaxies: spiral / galaxies: evolution / galaxies: high-redshift / galaxies: structure
© ESO, 2004
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