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Gemini Observatory

By F. Combes, J. Palous, Roberto G. Abraham, Patrick J. Mccarthy, Erin Mentuch, Preethi Nair, Jean-rené Gauthier, Ra Savaglio, David Crampton, Stephanie Juneau, Richard Murowinski, Damien Le Borgne, R. G. Carlberg, Inger Jørgensen, Hsiao-wen Chen and Ronald O. Marzke


Abstract. We have used the Hubble Space Telescope’s Advanced Camera for Surveys to measure the mass density function of morphologically-selected early-type galaxies in the Gemini Deep Deep Survey fields, over the redshift range 0.9 < z < 1.6. Our imaging data set covers four well-separated sight-lines, and is roughly intermediate (in terms of both depth and area) between the GOODS/GEMS imaging data, and the images obtained in the Hubble Deep Field campaigns. Our images contain 144 galaxies with ultra-deep spectroscopy, and they have been analyzed using a new purpose-written morphological analysis code which improves the reliability of morphological classifications by adopting a ‘quasi-petrosian ’ image thresholding technique. We find that at z = 1 approximately 70 % of the stars in massive galaxies reside in early-type systems. This fraction is remarkably similar to that seen in the local Universe. However, we detect very rapid evolution in this fraction over the range 1.0 < z < 1.6, suggesting that in this epoch the strong color-morphology relationship seen in the nearby Universe is beginning to fall into place

Topics: galaxy formation, morphology
Year: 2006
OAI identifier: oai:CiteSeerX.psu:
Provided by: CiteSeerX
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