Other
Scientific paper
Jul 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009hst..prop12167f&link_type=abstract
HST Proposal ID #12167. Cycle 18
Other
Scientific paper
We and other groups have discovered that galaxies with little or no star formation exist at redshifts beyond 1.5, and that these galaxies are very small for their stellar mass. These galaxies as a class are approximately 5 times smaller than nearby early-type galaxies of the same mass. These results have very significant implications, as they demonstrate that even the most boring galaxies at high redshift, which have no or little starformation, must undergo dramatic structural changes while evolving to low redshift. The results are still uncertain, however, as the stellar masses of these galaxies have been estimated from stellar population models. These masses have unknown errors, mostly due to uncertainties in the stellar initial mass function. The stellar population masses can be tested using dynamical mass estimators. We have taken high signal-to-noise deep spectra of quiescent galaxies at z ~1.5 - 2 using X-Shooter and LRIS on Keck. The spectra are exquisite and allow us to measure the velocity dispersions of these galaxies. To convert the dispersion to mass we need to measure accurate sizes of the galaxies. Here we propose to take WFC3 imaging so that we can measure the structural properties of these galaxies and derive their sizes, dynamical masses, and mass-to-light ratios.;
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