Physics
Scientific paper
Feb 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011noao.prop..514m&link_type=abstract
NOAO Proposal ID #2011A-0514
Physics
Scientific paper
One of the most fundamental questions regarding galaxy formation and evolution is when and how the most massive galaxies formed. Recent studies find that the number density of the most massive galaxies evolves little from z=4 to z ~ 1.5, contrary to the predictions from galaxy formation models, with the largest disagreement at 3 < z < 4. The discovery of a large, unexpected population of extremely massive galaxies at 3 < z < 4 is supported by the 0.5 deg.^2 NEWFIRM Medium-Band Survey (NMBS), a NOAO Survey program using medium band-width filters in the NIR to obtain high-accuracy photometric redshifts. Despite the unique depth and wavelength coverage of the NMBS, the existence of these galaxies is still intensely controversial. We propose to use NIRSPEC on Keck to obtain spectroscopic redshifts for the brightest ~50% of a large, unique, and homogeneous sample of 14 very massive galaxies at 3 < z < 4 selected from the NMBS. In 2 nights, NIRSPEC will provide continuum and emission line detections in the K-band allowing us to 1) spectroscopically confirm the existence of galaxies at 3
Dare Emily
Labb'e Ivo
Marchesini Danilo
van Dokkum Pieter
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