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

Jan 2005

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005iaus..216..390g&link_type=abstract

Maps of the Cosmos, Proceedings of IAU Symposium No. 216, held during the IAU General Assembly XXV in Sydney, Australia, 14-17 J

Astronomy and Astrophysics

Astronomy

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' 1>1 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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