Extremely Compact Massive Galaxies at 1.7<z<3

Details Extremely Compact Massive Galaxies at 1.7<z<3 Extremely Compact Massive Galaxies at 1.7<z<3

2008-11-18

arxiv.org/abs/0811.2931v1

Astronomy and Astrophysics

Astrophysics

4 pages, 2 figures, To appear in " Highlights of Spanish Astrophysics V " Proceedings of the VIII Scientific Meeting of the Sp

Scientific paper

We measure and analyse the sizes of 82 massive (M >= 10^11 M_Sun) galaxies at 1.72. We split our sample into disk-like (Sersic index n<=2) and spheroid-like (Sersic 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 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 ~2x10^10 M_Sun kpc^-3

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