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The fundamental plane of bulges at intermediate redshift

Published online by Cambridge University Press:  01 July 2007

Lauren A. MacArthur ,
Richard S. Ellis  and
Tommaso Treu
Lauren A. MacArthur
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA email: lam@astro.caltech.edu
Richard S. Ellis
Affiliation:
California Institute of Technology, Pasadena, CA 91125, USA email: lam@astro.caltech.edu
Tommaso Treu
Affiliation:
Department of Physics, University of California, Santa Barbara, CA 93106-9530, USA
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Abstract

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We report on a new study aimed at understanding the diversity and evolutionary properties of distant galactic bulges in the context of well-established trends for pure spheroidal galaxies. Bulges have been isolated for a sample of 137 spiral galaxies in the GOODS fields within the redshift range 0.1 < z < 1.2. Using proven photometric techniques we determine for each galaxy the characteristic parameters (size, surface brightness, profile shape) in the 4 GOODS-ACS imaging bands of both the disk and bulge components. Using the DEIMOS spectrograph on Keck, precision stellar velocity dispersions were secured for a sizeable fraction of the bulges. This has enabled us to compare the Fundamental Plane of our distant bulges with that of field spheroidal galaxies in a similar redshift range. Bulges in spiral galaxies with a bulge-to-total luminosity ratio (B/T) > 0.2 show very similar patterns of evolution to those seen for low luminosity spheroidals. To first order, their recent mass assembly histories are equivalent.

Keywords

galaxies: bulgesgalaxies: formationgalaxies: evolutiongalaxies: high-redshift
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 3 , Symposium S245: Formation and Evolution of Galaxy Bulges , July 2007 , pp. 443 - 446
Copyright
Copyright © International Astronomical Union 2008

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