%0 Journal Article
%A Barro, Guillermo
%A Cardiel López, Nicolás
%A Gallego Maestro, Jesús
%T Velocity dispersions and stellar populations of the most compact and massive early-type galaxies at redshift ~1
%D 2011
%@ 2041-8205
%U https://hdl.handle.net/20.500.14352/42999
%X We present Gran-Telescopio-Canarias/OSIRIS optical spectra of four of the most compact and massive early-type galaxies (ETGs) in the Groth Strip Survey at redshift z ~ 1, with effective radii R e = 0.5-2.4 kpc and photometric stellar masses M   = (1.2-4) × 1011 M ☉. We find that these galaxies have velocity dispersions σ = 156-236 km s–1. The spectra are well fitted by single stellar population models with approximately 1 Gyr of age and solar metallicity. We find that (1) the dynamical masses of these galaxies are systematically smaller by a factor of ~6 than the published stellar masses using BRIJK photometry, and (2) when estimating stellar masses as 0.7× M dyn, a combination of passive luminosity fading with mass/size growth due to minor mergers can plausibly evolve our objects to match the properties of the local population of ETGs.
%~