AAS 203rd Meeting, January 2004
Session 82 Mass and Energy Matters
Poster, Wednesday, January 7, 2004, 9:20am-6:30pm, Grand Hall

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[82.05] Exploring the Redshift Desert with the Gemini Deep Deep Survey

K. Glazebrook (Johns Hopkins University), Gemini Deep Deep Survey Team

The Gemini Deep Deep Survey is the first highly complete survey of galaxies in the redshift desert 1 < z < 2. Using photometric redshifts we exclude the z < 1 population and select galaxies to I < 24.5, K < 20.8 for spectroscopy. Using unprecedentedly long 100,000 sec exposures on the Gemini telescope with the GMOS spectrograph and the nod and shuffle technique we have secured high signal:noise spectra sufficient to obtain absorption line redshifts of both old & red galaxies and young starforming galaxies out to z=2. Our sample is 80% complete and has 120 confirmed redshifts with 1.3 < z < 2. We find an abundance of red objects, spectroscopically confirmed to be old populations and not reddened, in the former desert and have determined stellar masses using SED fitting and our K photometry. We find that two thirds of the mass in the Universe at z=2 is in old, non-starforming galaxies and have determined a preliminary mass function. We also find a population of massive star-forming galaxies with masses comparable to present day galaxies like the Milky Way but star-formation rates 4--5 times higher. An analysis of the ISM absorption lines indicates these systems have approximately solar metallicity.

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Bulletin of the American Astronomical Society, 35 #5
© 2003. The American Astronomical Soceity.