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- When do early-type galaxies form?
- Abraham, Roberto G.; McCarthy, Patrick J.; Mentuch, Erin; Glazebrook, Karl; Nair, Preethi; Gauthier, Jean-Ren; Savaglio, Sandra; Crampton, David; Juneau, Stephanie; Murowinski, Richard; Le Borgne, Damien; Carlberg, Ray G.; Jørgensen, Inger; Roth, Kathy; Chen, Hsiao Wen; Marzke, Ronald O.
- 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 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.
- Publication type
- Conference paper
- Research centre
- Swinburne University of Technology. Faculty of Information and Communication Technologies. Centre for Astrophysics and Supercomputing
- Galaxy evolution across the Hubble time: proceedings of the International Astronomical Union Symposium 235, Prague, Czech Republic, 14-17 August 2006 / Françoise Combes and Jan Palouš (eds.), Vol. 2, pp. 345-349
- Publication year
- Galaxy evolution; Galaxy formation; Gemini Deep Deep Survey; GOODS/GEMS imaging data; Hubble Deep Field campaigns; Hubble Space Telescope; Morphology
- Cambridge University Press
- 1743-9213 (series ISSN)
- 9780521863445, 0521863449
- Publisher URL
- Copyright © International Astronomical Union 2007. Published version of the paper reproduced here in accordance with the copyright policy of the publisher.
- Full text
- Peer reviewed