Outer-disk reddening and gas-phase metallicities: The CALIFA connection
Author
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Marino, R.
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Gil de Paz, A.
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Sánchez, S.
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Sánchez Blázquez, P.
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Cardiel, N.
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Castillo Morales, A.
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Pascual, S.
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Vilchez, J.
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Kehrig, C.
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Molla, M.
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Méndez Abreu, J.
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Catalán Torrecilla, C.
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Florido, E.
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Pérez, I.
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Ruiz Lara, T.
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Ellis, S.
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López Sánchez, Ángel R.
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González Delgado, R. M.
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Lorenzo Cáceres, A. de
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García Benito, R.
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Galbany, Lluis
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Zibett, S.
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Cortijo, C.
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Kalinova, V.
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Mast, D.
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Iglesias Paramo, J.
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Papaderos, P.
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Walcher, C.
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Bland Hawthorn, J.
Admission date
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2016-06-16T23:07:31Z
Available date
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2016-06-16T23:07:31Z
Publication date
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2016
Cita de ítem
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Astronomy & Astrophysics Volumen: 585 Número de artículo: A47 (2016)
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Identifier
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DOI: 10.1051/0004-6361/201526986
Identifier
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https://repositorio.uchile.cl/handle/2250/138947
General note
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Artículo de publicación ISI
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Abstract
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We study, for the first time in a statistically significant and well-defined sample, the relation between the outer-disk ionized-gas metallicity gradients and the presence of breaks in the surface brightness profiles of disk galaxies. Sloan Digital Sky Survey (SDSS) g' - and r' - band surface brightness, (g' - r') color, and ionized-gas oxygen abundance profiles for 324 galaxies within the Calar Alto Legacy Integral Field Area (CALIFA) survey are used for this purpose. We perform a detailed light-profile classification, finding that 84% of our disks show down- or up-bending profiles (Type II and Type III, respectively), while the remaining 16% are well fitted by one single exponential (Type I). The analysis of the color gradients at both sides of this break shows a U-shaped profile for most Type II galaxies with an average minimum (g' - r') color of similar to 0.5mag and an ionized-gas metallicity flattening associated with it only in the case of low-mass galaxies. Comparatively, more massive systems show a rather uniform negative metallicity gradient. The correlation between metallicity flattening and stellar mass for these systems results in p-values as low as 0.01. Independent of the mechanism having shaped the outer light profiles of these galaxies, stellar migration or a previous episode of star formation in a shrinking star-forming disk, it is clear that the imprint in their ionized-gas metallicity was different for low-and high-mass Type II galaxies. In the case of Type III disks, a positive correlation between the change in color and abundance gradient is found (the null hypothesis is ruled out with a p-value of 0.02), with the outer disks of Type III galaxies with masses <= 10(10) M-circle dot showing a weak color reddening or even a bluing. This is interpreted as primarily due to a mass downsizing effect on the population of Type III galaxies that recently experienced an enhanced inside-out growth.
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Patrocinador
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Spanish program of International Campus of Excellence Moncloa (CEI); Spanish Ministerio de Economia y Competitividad (MINECO)
AyA2010-15081
AyA2012-30717
AyA2013-46724P; European Commission, via the Initial Training Network DAGAL under REA
PITN-GA-2011-289313 ; Spanish Ministerio de Educacion, Cultura y Deporte; Marie Curie Career Integration Grant
303912; Ministry of Economy, Development, and Tourism's Millennium Science Initiative
IC 120009; CONIC YT through FONDECYT
3140566; European Research Council ; FCT through the Investigador FCT
IF/01220/2013; FCT - FCT-MEC (PIDDAC)
FCOMP-01-0124-FEDER-029170
FCT PTDC/FIS-AST/3214/2012 ; CONACYT-125180;
DGAPA-IA100815