Weak Velocity Dispersion Evolution of Spheroid-like Massive Galaxies since z~2 Export

@article{citeulike:4118292, abstract = {Making use of public spectra from Cimatti et al (2008), we constrain for the first time the velocity dispersion of spheroid-like massive (M\_star \~{} 10^11 M\_sun) galaxies at z \~{} 1.6. By comparing with galaxies of similar stellar mass at lower redshifts, we find evidence for a weak evolution in velocity dispersion, decreasing from \~{}240 km/s at z \~{} 1.6 down to \~{}180 km/s 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.}, archivePrefix = {arXiv}, author = {Cenarro, Javier A. and Trujillo, Ignacio}, citeulike-article-id = {4118292}, citeulike-linkout-0 = {http://arxiv.org/abs/0902.4893}, citeulike-linkout-1 = {http://arxiv.org/pdf/0902.4893}, day = {27}, eprint = {0902.4893}, keywords = {dispersion, evolution, velocity}, month = {Feb}, posted-at = {2009-03-08 18:01:30}, priority = {2}, title = {Weak Velocity Dispersion Evolution of Spheroid-like Massive Galaxies since z\~{}2}, url = {http://arxiv.org/abs/0902.4893}, year = {2009} }

TY - JOUR ID - citeulike:4118292 L3 - citeulike-article-id:4118292 N2 - Making use of public spectra from Cimatti et al (2008), we constrain for the first time the velocity dispersion of spheroid-like massive (M_star ~ 10^11 M_sun) galaxies at z ~ 1.6. By comparing with galaxies of similar stellar mass at lower redshifts, we find evidence for a weak evolution in velocity dispersion, decreasing from ~240 km/s at z ~ 1.6 down to ~180 km/s 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. TI - Weak Velocity Dispersion Evolution of Spheroid-like Massive Galaxies since z~2 KW - dispersion KW - evolution KW - velocity AU - Cenarro, Javier AU - Trujillo, Ignacio PY - 2009/Feb/27/ UR - http://arxiv.org/abs/0902.4893 ER -