Extremely Compact Massive Galaxies at 1.7 < z < 3 [chapter]

Fernando Buitrago, Ignacio Trujillo, Christopher J. Conselice
2010 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, and
more » ... tems, and spheroid-like galaxies at the same redshift are 4.3 ± 0.7 times smaller than comparatively massive elliptical galaxies today. We furthermore show that the stellar mass densities of very massive galaxies at z ∼ 2.5 are similar to present-day globular clusters with values ∼ 2 × 10 10 M kpc −3
doi:10.1007/978-3-642-11250-8_30 fatcat:6teyrzldejf4do3yod3tuxxvea