[32.06] The sizes of high-redshift galaxies in the Great Observatories Origins Deep Survey

AAS 201st Meeting, January, 2003
Session 32. Galaxy Evolution and Surveys: ``Far Away"
Oral, Monday, January 6, 2003, 2:00-3:30pm, 608-609

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[32.06] The sizes of high-redshift galaxies in the Great Observatories Origins Deep Survey

H. C. Ferguson, M. E. Dickinson, J. P. Gardner, M. Giavalisco, C. Kretchmer, P. Madau, L. Moustakas, C. Papovich, H. Spinrad, D. Stern, R. Idzi (), GOODS Team

Hubble Space Telescope ACS images of color-selected high-redshift galaxies are used to examine the size distribution of galaxies as a function of redshift at lookback times t > 10 Gyr. Observations consist of images taken in the F435W (B), F606W (V), F775W (i) , and F850LP (z) filters to depths of roughly AB = 26 mag in the z band. The images have a resolution of approximately 0.1 arcsec, providing a resolution better than 1 kpc at any redshift for a reasonable range of cosmological parameters. The observations are used to test whether galaxy sizes at high redshifts evolve as H^-1(z), as expected if the sizes of the star-forming portions of galaxies follow the evolution in the virial radius of dark-matter halos.

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