Biology – Quantitative Biology – Quantitative Methods
Scientific paper
Jul 2006
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006hst..prop10808v&link_type=abstract
HST Proposal ID #10808. Cycle 15
Biology
Quantitative Biology
Quantitative Methods
Scientific paper
Using a combination of wide-field near-infrared imaging and very deep follow-up near-infrared spectroscopy we have identified a population of massive "red and dead" galaxies at z~2.5. The galaxies lack emission lines and have strong Balmer/4000 Angstrom breaks, demonstrating directly that they have evolved stellar populations. These objects are very likely progenitors of massive ellipticals today and may be descendants of the first generation of galaxies. We propose to image 10 of these objects with the NIC2 camera to determine their morphologies. The goals are to 1 determine whether they have the sizes of present-day early-types or are more compact, as predicted by models, 2 determine the morphology, using visual classification and quantitative methods, and 3 constrain the evolution of the Kormendy relation from z~2.5 to the present. These observations will show whether the oldest and most massive galaxies at z~2.5 were already fully formed or still in the process of assembly.
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