Probing the Redshift Desert Using the Gemini Deep Deep Survey: observing galaxy mass assembly at z>1

Details Probing the Redshift Desert Using the Gemini Deep Deep Survey: observing galaxy mass assembly at z>1 Probing the Redshift Desert Using the Gemini Deep Deep Survey: observing galaxy mass assembly at z>1

2003-11-03

arxiv.org/abs/astro-ph/0311045v1

Astronomy and Astrophysics

Astrophysics

8 pages, 5 figures, write up of talk at IAU Symposium 216 (2003)

Scientific paper

The aim of the Gemini Deep Deep Survey is to push spectroscopic studies of complete galaxy samples (both red and blue objects) significantly beyond z=1; this is the redshift where the current Hubble sequence of ellipticals and spirals is already extant. In the Universe at z=2 the only currently spectroscopically confirmed galaxies are blue, star-forming and of fragmented morphology. Exploring this transition means filling the `redshift desert' 11 which has led us to carry out the longest exposure redshift survey ever done: 100 ksec spectroscopic MOS exposures with GMOS on Gemini North. We have developed an implementation of the CCD ``nod & shuffle'' technique to ensure precise sky-subtraction in these ultra-deep exposures. At the halfway mark the GDDS now has ~36 galaxies in the redshift desert 1.2

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