Size Evolution in Red Galaxies from the WFC3 Early Release Science Program

Details Size Evolution in Red Galaxies from the WFC3 Early Release Science Program Size Evolution in Red Galaxies from the WFC3 Early Release Science Program

Jan 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010aas...21533803m&link_type=abstract

American Astronomical Society, AAS Meeting #215, #338.03; Bulletin of the American Astronomical Society, Vol. 42, p.442

Astronomy and Astrophysics

Astronomy

Scientific paper

The apparent dramatic evolution in the sizes of passive red galaxies at redshifts greater than unity is one of the outstanding problems in understanding galaxy evolution. At z = 2 passive galaxies have half-light radii a factor of 2 x 3 smaller than comparable mass early type galaxies today. We use deep multi-band observations of a portion of the GOODS South field to examine size evolution in color-selected samples. The WFC3 Early Release Science program provides 40 square arcminutes of deep Y, J and H band observations to supplement the deep ACS images in the northern one third of the GOODS South field. We use multi-color selection and the excellent spatial sampling of the WFC3 images to measure sizes and derive the Kormendy relation for galaxies with lower stellar masses than possible with ground-based surveys.

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