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Astrophysics and Space Science Proceedings
We measure and analyse the sizes of 82 massive (M ≥ 10 11 M ) galaxies at 1.7 ≤ z ≤ 3 utilizing deep HST NICMOS data taken in the GOODS North and South fields. Our sample provides the first statistical study of massive galaxy sizes at z > 2. We split our sample into disk-like (Sérsic index n ≤ 2) and spheroidlike (Sérsic index n > 2) galaxies, and find that at a given stellar mass, disk-like galaxies at z ∼ 2.3 are a factor of 2.6 ± 0.3 smaller than present day equal mass systems, anddoi:10.1007/978-3-642-11250-8_30 fatcat:6teyrzldejf4do3yod3tuxxvea