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Astronomy and Astrophysics | 2016

Outer-disk reddening and gas-phase metallicities: The CALIFA connection

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

The O3N2 and N2 abundance indicators revisited : improved calibrations based on CALIFA and Te-based literature data

R. A. Marino; Armando Gil de Paz; África Castillo Morales; otros


Revista Mexicana De Astronomia Y Astrofisica | 2013

MEGARA: the future IFU and MOS of the 10.4 M GTC

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

Extreme magnification of an individual star at redshift 1.5 by a galaxy-cluster lens

Pablo Guillermo Pérez González; otros


Archive | 2018

Clumpy Galaxies in CANDELS. II. Physical Properties of UV-bright Clumps at 0.5 <= z < 3

Pablo Guillermo Pérez González; otros


Archive | 2018

Morpho-kinematic properties of field S0 bulges in the CALIFA survey

Cristina Catalán Torrecilla; otros


Archive | 2018

Major merging history in CANDELS. I. Evolution of the incidence of massive galaxy-galaxy pairs from z=3 to z ∼ 0

Pablo Guillermo Pérez González; otros


Archive | 2018

The relationship between galaxy and dark matter halo size from z ∼ 3 to the present

Pablo Guillermo Pérez González; otros


Archive | 2017

Gran Telescopio Canarias observations of an overdense region of Lyman alpha emitters at z=6.5

Jesús Gallego Maestro; otros


Archive | 2017

Arm and interarm abundance gradients in CALIFA spiral galaxies

Cristina Catalán Torrecilla; otros

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Nicolás Cardiel López

National Autonomous University of Mexico

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África Castillo Morales

Autonomous University of Madrid

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Armando Gil de Paz

Complutense University of Madrid

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Jaime Zamorano Calvo

Complutense University of Madrid

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Armando Gil de Paz

Complutense University of Madrid

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Jesús Gallego Maestro

Complutense University of Madrid

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