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Título:
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The galexis^(4)g uv-ir color-color diagram: catching spiral galaxies away from the blue sequence
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Autores:
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Bouquin, Alexandre Y. K. ;
Gil de Paz, Armando ;
Boissier, Samuel ;
Muñoz Mateos, Juan Carlos ;
Sheth, Kartik ;
Zaritsky, Dennis ;
Laine, Jarkko ;
Gallego Maestro, Jesús ;
Peletier, Reynier F. ;
Roeck, Benjamin R. ;
Knapen, Johan H.
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Tipo de documento:
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texto impreso
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Editorial:
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IOP Publishing, 2015-02-10
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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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Tipo = Artículo
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Resumen:
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We obtained GALEX FUV, NUV, and Spitzer/ IRAC 3.6 ?m photometry for > 2000 galaxies, available for 90% of the S^(4)G sample. We find a very tight. GALEX blue sequence (GBS) in the (FUV- NUV) versus (NUV-[3.6]) color- color diagram, which is populated by irregular and spiral galaxies, and is mainly driven by changes in the formation timescale (tau) and a degeneracy between (tau) and dust reddening. The tightness of the GBS provides an unprecedented way of identifying star- forming galaxies and objects that are just evolving to (or from) what we call the. GALEX green valley (GGV). At the red end of the GBS, at (NUV-[3.6]) > 5, we find a wider. GALEX red sequence (GRS) mostly populated by E/ S0 galaxies that has a perpendicular slope to that of the GBS and of the optical red sequence. We find no such dichotomy in terms of stellar mass (measured by M_([3.6])) since both massive (M. > 10^(11)M.) blue- and red- sequence galaxies are identified. The type that is proportionally more often found in the GGV is the S0- Sa's, and most of these are located in high- density environments. We discuss evolutionary models of galaxies that show a rapid transition from the blue to the red sequence on a timescale of 10^(8) yr.
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En línea:
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https://eprints.ucm.es/id/eprint/29180/1/jesusgallego124libre.pdf
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