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Mild Velocity Dispersion Evolution of massive galaxies since z~2

Published online by Cambridge University Press:  13 April 2010

Ignacio Trujillo  and
A. Javier Cenarro
Ignacio Trujillo
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain email: trujillo@iac.es; cenarro@cefca.es Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
A. Javier Cenarro
Affiliation:
Instituto de Astrofísica de Canarias, Vía Láctea s/n, 38200 La Laguna, Tenerife, Spain email: trujillo@iac.es; cenarro@cefca.es Departamento de Astrofísica, Universidad de La Laguna, E-38205 La Laguna, Tenerife, Spain
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Abstract

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Making use of public spectra from Cimatti et al. (2008), we measure for the first time the velocity dispersion of spheroid-like massive (M* ~ 1011M⊙) galaxies at z ~ 1.6. By comparing with galaxies of similar stellar mass at lower redshifts, we find evidence for a mild evolution in velocity dispersion, decreasing from ~240 kms−1 at z ~ 1.6 down to ~180 km s−1 at z ~ 0. Such mild evolution contrasts with the strong change in size (a factor of ~4) found for these type of objects in the same cosmic time, and it is consistent with a progressive larger role, at lower redshift, of the dark matter halo in setting the velocity dispersion of these galaxies. We discuss the implications of our results within the context of different scenarios proposed for the evolution of these massive objects.

Keywords

galaxies: evolution — galaxies: formation — galaxies: structure — galaxies: kinematics and dynamics
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 5 , Symposium S262: Stellar Populations – Planning for the Next Decade , August 2009 , pp. 184 - 187
Copyright
Copyright © International Astronomical Union 2010

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