Título:
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Velocity dispersions and stellar populations of the most compact and massive early-type galaxies at redshift ~1
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Autores:
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Barro, Guillermo ;
Cardiel López, Nicolás ;
Gallego Maestro, Jesús
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Tipo de documento:
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texto impreso
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Editorial:
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IOP Publishing, 2011-09-10
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Dimensiones:
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application/pdf
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Nota general:
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info:eu-repo/semantics/openAccess
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Idiomas:
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Palabras clave:
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Estado = Publicado
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Materia = Ciencias: Física: Astrofísica
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Tipo = Artículo
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Resumen:
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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 ? = 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.
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En línea:
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https://eprints.ucm.es/59785/1/cardiel07.pdf
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