Mild Velocity Dispersion Evolution of massive galaxies since z~2

Details Mild Velocity Dispersion Evolution of massive galaxies since z~2 Mild Velocity Dispersion Evolution of massive galaxies since z~2

Apr 2010

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2010iaus..262..184t&link_type=abstract

Stellar Populations – Planning for the Next Decade, Proceedings of the International Astronomical Union, IAU Symposium, Volume 2

Astronomy and Astrophysics

Astronomy

Galaxies: Evolution — Galaxies: Formation — Galaxies: Structure — Galaxies: Kinematics And Dynamics

Scientific paper

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&sun;) 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.

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