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http://hdl.handle.net/20.500.12386/25939
Titolo: | Outer-disk reddening and gas-phase metallicities: The CALIFA connection | Autori: | Marino, R. A. Gil de Paz, A. Sánchez, S. F. Sánchez-Blázquez, P. Cardiel, N. Castillo-Morales, A. Pascual, S. Vílchez, J. Kehrig, C. Mollá, M. Mendez-Abreu, J. Catalán-Torrecilla, C. Florido, E. Perez, I. Ruiz-Lara, T. Ellis, S. López-Sánchez, A. R. González Delgado, R. M. de Lorenzo-Cáceres, A. García-Benito, R. Galbany, L. ZIBETTI, Stefano Cortijo, C. Kalinova, V. Mast, D. Iglesias-Páramo, J. Papaderos, P. Walcher, C. J. Bland-Hawthorn, J. |
Data pubblicazione: | 2016 | Rivista: | ASTRONOMY & ASTROPHYSICS | Numero: | 585 | Da pagina:: | A47 | Abstract: | 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-gasoxygen 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 ~0.5 mag 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<SUP>10</SUP> M<SUB>☉</SUB> 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. | URI: | http://hdl.handle.net/20.500.12386/25939 | URL: | https://www.aanda.org/articles/aa/abs/2016/01/aa26986-15/aa26986-15.html | ISSN: | 0004-6361 | DOI: | 10.1051/0004-6361/201526986 | Bibcode ADS: | 2016A&A...585A..47M | Fulltext: | open |
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