nan otros
Complutense University of Madrid
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Astronomy and Astrophysics | 2016
R. A. Marino; Armando Gil de Paz; Nicolás Cardiel López; África Castillo Morales; Cristina Catalán Torrecilla; otros
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 ≤10^10 M_⊙ 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.
Astronomy and Astrophysics | 2013
R. A. Marino; Armando Gil de Paz; África Castillo Morales; otros
Revista Mexicana De Astronomia Y Astrofisica | 2013
Armando Gil de Paz; Jesús Gallego Maestro; África Castillo Morales; María del Carmen Eliche Moral; R. A. Marino; Sergio Pascual Ramírez; Jaime Zamorano Calvo; Nicolás Cardiel López; Pablo Guillermo Pérez González; otros
Archive | 2018
Pablo Guillermo Pérez González; otros
Archive | 2018
Pablo Guillermo Pérez González; otros
Archive | 2018
Cristina Catalán Torrecilla; otros
Archive | 2018
Pablo Guillermo Pérez González; otros
Archive | 2018
Pablo Guillermo Pérez González; otros
Archive | 2017
Jesús Gallego Maestro; otros
Archive | 2017
Cristina Catalán Torrecilla; otros