Ultra-Deep KECK spectroscopy of early-type galaxies in GOODS-N

Details Ultra-Deep KECK spectroscopy of early-type galaxies in GOODS-N Ultra-Deep KECK spectroscopy of early-type galaxies in GOODS-N

Dec 2004

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004aas...205.3102t&link_type=abstract

American Astronomical Society Meeting 205, #31.02; Bulletin of the American Astronomical Society, Vol. 36, p.1397

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We present the first result of a spectroscopic follow-up of 250 early-type galaxies in the GOODS-N field. Ultra deep Keck spectra (6-12 hrs) are used to derive stellar velocity dispersion and, together with GOODS photometry, to measure the evolution of the Fundamental Plane out to z=1.2. The implied evolution of the mass to light ratio is found to depend strongly on galaxy mass. The most massive E/S0 are old and dead, while evidence for continuing star formation is found in less massive galaxies. The implication of this ``downsizing" phenomenon in terms of cosmological models of galaxy formation is briefly discussed.
Funding from Hubble Fellowship HF-01167.01 and STScI grant AR-09920.01 is gratefully acknowledged.

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