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Título:
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Radial distribution of stars, gas, and dust in sings galaxies. II. Derived dust properties
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Autores:
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Muñoz Mateos, J. C. ;
Gil de Paz, Armando ;
Boissier, S. ;
Zamorano Calvo, Jaime ;
Dale, D. A. ;
Pérez González, Pablo Guillermo ;
Gallego Maestro, Jesús ;
Madore, B. F. ;
Bendo, G. ;
Thornley, M. D. ;
Draine, B. T. ;
Boselli, A. ;
Buat, V. ;
Calzetti, D. ;
Moustakas, J. ;
Kennicutt, R. C. Jr.
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Tipo de documento:
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texto impreso
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Editorial:
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American Astronomical Society, 2009-08-20
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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 present a detailed analysis of the radial distribution of dust properties in the SINGS sample, performed on a set of ultraviolet (UV), infrared (IR), and Hi surface brightness profiles, combined with published molecular gas profiles and metallicity gradients. The internal extinction, derived from the total-IR (TIR)-to-far-UV (FUV) luminosity ratio, decreases with radius, and is larger in Sb-Sbc galaxies. The TIR-to-FUV ratio correlates with the UV spectral slope ?, following a sequence shifted to redder UV colors with respect to that of starbursts. The star formation history (SFH) is identified as the main driver of this departure. Both L_TIR)/L_FUV and ? correlate well with metallicity, especially in moderately face-on galaxies. The relation shifts to redder colors with increased scatter in more edge-on objects. By applying physical dust models to our radial spectral energy distributions, we have derived radial profiles of the total dust mass surface density, the fraction of the total dust mass contributed by polycyclic aromatic hydrocarbons (PAHs), and the intensity of the radiation field heating the grains. The dust profiles are exponential, their radial scale length being constant from Sb to Sd galaxies (only ~ 10% larger than the stellar scale length). Many S0/a-Sab galaxies have central depressions in their dust radial distributions. The PAH abundance increases with metallicity for 12 + log(O/H)
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En línea:
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https://eprints.ucm.es/id/eprint/34151/1/jesusgallego45libre.pdf
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