Velocity dispersions and stellar populations of the most compact and massive early-type galaxies at redshift ∼1

J. Martínez-Manso, R. Guzmán, G. Barro, A. J. Cenarro, P. G. Pérez-González, P. Sánchez-Blázquez, I. Trujillo, M. Balcells, N. Cardiel, J. Gallego, A. Hempel, M. Prieto

Resultado de la investigación: Contribución a una revistaArtículo de la conferenciarevisión exhaustiva

Resumen

We present Gran-Telescopio-Canarias/OSIRIS optical spectra of 4 of the most compact and massive early-type galaxies in the Groth Strip Survey at redshift z ∼ 1, with effective radii Re = 0.5 - 2.4 kpc and photometric stellar masses M* = 1.2 - 4 × 1011 M . We find 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: (i) the dynamical masses of these galaxies are systematically smaller by a factor of ∼6 than the published stellar masses; (ii) when estimating stellar masses as 0.7 × Mdyn, 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 early-type galaxies.

Idioma originalInglés
Páginas (desde-hasta)26-27
Número de páginas2
PublicaciónRevista Mexicana de Astronomia y Astrofisica: Serie de Conferencias
Volumen42
EstadoPublicada - 3 jun 2013
Evento4th Meeting on Science with the Gran Telescopio Canarias - Santa Cruz de La Palma, Espana
Duración: 16 nov 201118 nov 2011

Áreas temáticas de ASJC Scopus

  • Ciencias planetarias y espacial
  • Astronomía y astrofísica

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