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Morphological properties of massive galaxies at high−z from GOODS

Published online by Cambridge University Press:  01 July 2007

Swara Ravindranath
Affiliation:
Inter-University of Astronomy & Astrophysics, Pune, Maharashtra, India email: swara@iucaa.ernet.in
E. Daddi
Affiliation:
CEA Saclay/Service d'Astrophysique, Gif-sur-Yvette Cedex, France email: edaddi@cea.fr
M. Giavalisco
Affiliation:
University of Massachusetts, Amherst, Massacheussetts, USA email: mauro@astro.umass.edu
H. C. Ferguson
Affiliation:
Space Telescope Science Institute, Baltimore, Maryland, USA email: ferguson@stsci.edu
M. E. Dickinson
Affiliation:
National Optical Astronomy Observatory, Tucson, Arizona, USA email: med@noao.edu
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Abstract

We have used the BzK-selection to identify a composite population of passive, and star-forming galaxies at redshifts 1.4 ≤ z ≤ 2.5 from the Great Observatories Origins Deep Survey (GOODS). Using an unprecedented large sample of galaxies in this redshift range, we characterize the morphological diversity through the analysis of the surface-brightness profile shapes for 171 galaxies with passive SEDs, and 1068 star-forming galaxies. We find that the z ~ 2 galaxies display a wide range of morphologies, from spheroidals to disk-like. Interestingly, the galaxies with passively-evolving SEDs predominantly have steep profiles as seen for the classical bulges at low redshifts, although they are very compact with re < 3 kpc. The star-forming galaxies on the other hand exhibit mostly disk-like and merger morphologies, and have sizes comparable to their low−z counterparts. Our results emphasize the need for an unbiased selection in order to reveal the morphological diversities, and range of galaxy properties at high redshifts.

Type
Contributed Papers
Copyright
Copyright © International Astronomical Union 2008

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