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Título:
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Velocity Dispersions and Stellar Populations of the Most Compact and Msssive early-Type Galaxies at Redshift similar to 1
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Autores:
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Martínez Manso, Jesús ;
Guzmán, Rafael ;
Barro, Guillermo ;
Cenarro, Javier ;
Pérez González, Pablo Guillermo ;
Sánchez Blázquez, Patricia ;
Trujillo, Ignacio ;
Balcells, Marc ;
Cardiel López, Nicolás ;
Hempel, Angela ;
Prieto, Mercedes
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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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Materia = Ciencias: Física: Astronomía
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Materia = Ciencias: Física: Física atmosférica
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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 similar to 1, with effective radii R-e = 0.5-2.4 kpc and photometric stellarmasses M-star = (1.2-4) x 10(11)M(circle dot). We find that these galaxies have velocity dispersions sigma = 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 similar to 6 than the published stellarmasses using BRIJK photometry, and (2) when estimating stellarmasses as 0.7xM(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/id/eprint/27876/1/cardiel07.pdf
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