RT Journal Article
T1 Outer-disk reddening and gas-phase metallicities: The CALIFA connection
A1 Marino, Raffaella Anna
A1 Gil De Paz, Armando
A1 Sánchez, S. F.
A1 Sánchez Blázquez, Patricia
A1 Cardiel López, Nicolás
A1 Castillo Morales, María África
A1 Pascual Ramírez, Sergio
A1 Vílchez, J.
A1 Kehrig, C.
A1 Mollá, M.
A1 Mendez Abreu, J.
A1 Catalán Torrecilla, Cristina
A1 Florido, E.
A1 Perez, I.
A1 Ruiz Lara, T.
A1 Ellis, S.
A1 López Sánchez, A. R.
A1 González Delgado, R. M.
A1 Lorenzo Cáceres, A. de
A1 García Benito, R.
A1 Galbany, L.
A1 Zibetti, S.
A1 Cortijo, C.
A1 Kalinova, V.
A1 Mast, D.
A1 Iglesias Páramo, J.
A1 Papaderos, P.
A1 Walcher, C. J.
A1 Bland Hawthorn, J.
A1 CALIFA Team, 
AB 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.
PB EDP Sciencies
SN 1432-0746
YR 2016
FD 2016-01
LK https://hdl.handle.net/20.500.14352/24440
UL https://hdl.handle.net/20.500.14352/24440
LA eng
NO Marino, R. A., Gil de Paz, A., Sánchez, S. F. et al. «Outer-Disk Reddening and Gas-Phase Metallicities: The CALIFA Connection». Astronomy & Astrophysics, vol. 585, enero de 2016, p. A47. www.aanda.org, https://doi.org/10.1051/0004-6361/201526986.
NO Unión Europea - FP7
NO Ministerio de Economía, Comercio y Empresa (España)
NO Campus de Excelencia Internacional Moncloa
NO Unión Europea - Acciones Marie Curie
NO Ministerio de Educación, Formación Profesional y Deportes (España)
NO Ministry of Economy, Development, and Tourism's Millennium Science Initiative
NO Fondo Nacional de Desarrollo Científico, Tecnológico y de Innovación Tecnológica (Chile)
NO Iniciativa Científica Milenio (Chile)
NO FCT Investigator Programme (Portugal)
NO Ministério da Educação e Ciência (Portugal)
NO Dirección General Asuntos del Personal Académico - Universidad Nacional Autónoma de México
NO Fondo Europeo de Desarrollo Regional
NO Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016 I+D+i - Ministerio de Economía, Comercio y Empresa (España)
NO Ministerio Economía, Fomento y Turismo (Chile)
NO Millennium Institute of Astrophysics
NO Comisión Nacional de Investigación Científica y Tecnológica (Chile)
NO Universidad Nacional Autónoma de México
DS Docta Complutense
RD 15 sept 2024