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

R. A. Marino, A. Gil De Paz, S. F. Sánchez, P. Sánchez-Blázquez, N. Cardiel, A. Castillo-Morales, S. Pascual, J. Vílchez, C. Kehrig, M. Mollá, J. Mendez-Abreu, C. Catalán-Torrecilla, E. Florido, I. Perez, T. Ruiz-Lara, S. Ellis, A. R. López-Sánchez, R. M. González Delgado, A. De Lorenzo-Cáceres, R. García-Benito & 10 others L. Galbany, S. Zibetti, C. Cortijo, V. Kalinova, D. Mast, J. Iglesias-Páramo, P. Papaderos, C. J. Walcher, J. Bland-Hawthorn, Califa Team

Research output: Contribution to journalArticleResearchpeer-review

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-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 ∼ 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 ≤1010 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.

LanguageEnglish
Article numberA47
Pages1-29
Number of pages29
JournalAstronomy and Astrophysics
Volume585
DOIs
Publication statusPublished - 1 Jan 2016

Fingerprint

metallicity
vapor phases
galaxies
ionized gases
gas
color
profiles
gradients
flattening
brightness
null hypothesis
disk galaxies
stellar mass
star formation
oxygen
stars

Keywords

  • Galaxies: abundances
  • Galaxies: evolution
  • Galaxies: ISM
  • Galaxies: photometry
  • Hii regions
  • ISM: abundances

Cite this

Marino, R. A., Gil De Paz, A., Sánchez, S. F., Sánchez-Blázquez, P., Cardiel, N., Castillo-Morales, A., ... Team, C. (2016). Outer-disk reddening and gas-phase metallicities: The CALIFA connection. Astronomy and Astrophysics, 585, 1-29. [A47]. https://doi.org/10.1051/0004-6361/201526986
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, S. ; Cortijo, C. ; Kalinova, V. ; Mast, D. ; Iglesias-Páramo, J. ; Papaderos, P. ; Walcher, C. J. ; Bland-Hawthorn, J. ; Team, Califa. / Outer-disk reddening and gas-phase metallicities : The CALIFA connection. In: Astronomy and Astrophysics. 2016 ; Vol. 585. pp. 1-29.
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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-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 ∼ 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 ≤1010 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.",
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Marino, RA, Gil De Paz, A, Sánchez, SF, 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, AR, González Delgado, RM, De Lorenzo-Cáceres, A, García-Benito, R, Galbany, L, Zibetti, S, Cortijo, C, Kalinova, V, Mast, D, Iglesias-Páramo, J, Papaderos, P, Walcher, CJ, Bland-Hawthorn, J & Team, C 2016, 'Outer-disk reddening and gas-phase metallicities: The CALIFA connection' Astronomy and Astrophysics, vol. 585, A47, pp. 1-29. https://doi.org/10.1051/0004-6361/201526986

Outer-disk reddening and gas-phase metallicities : The CALIFA connection. / 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, S.; Cortijo, C.; Kalinova, V.; Mast, D.; Iglesias-Páramo, J.; Papaderos, P.; Walcher, C. J.; Bland-Hawthorn, J.; Team, Califa.

In: Astronomy and Astrophysics, Vol. 585, A47, 01.01.2016, p. 1-29.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - Outer-disk reddening and gas-phase metallicities

T2 - Astronomy and Astrophysics

AU - Marino,R. A.

AU - Gil De Paz,A.

AU - Sánchez,S. F.

AU - Sánchez-Blázquez,P.

AU - Cardiel,N.

AU - Castillo-Morales,A.

AU - Pascual,S.

AU - Vílchez,J.

AU - Kehrig,C.

AU - Mollá,M.

AU - Mendez-Abreu,J.

AU - Catalán-Torrecilla,C.

AU - Florido,E.

AU - Perez,I.

AU - Ruiz-Lara,T.

AU - Ellis,S.

AU - López-Sánchez,A. R.

AU - González Delgado,R. M.

AU - De Lorenzo-Cáceres,A.

AU - García-Benito,R.

AU - Galbany,L.

AU - Zibetti,S.

AU - Cortijo,C.

AU - Kalinova,V.

AU - Mast,D.

AU - Iglesias-Páramo,J.

AU - Papaderos,P.

AU - Walcher,C. J.

AU - Bland-Hawthorn,J.

AU - Team,Califa

PY - 2016/1/1

Y1 - 2016/1/1

N2 - 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 ∼ 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 ≤1010 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.

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-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 ∼ 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 ≤1010 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.

KW - Galaxies: abundances

KW - Galaxies: evolution

KW - Galaxies: ISM

KW - Galaxies: photometry

KW - Hii regions

KW - ISM: abundances

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Marino RA, Gil De Paz A, Sánchez SF, Sánchez-Blázquez P, Cardiel N, Castillo-Morales A et al. Outer-disk reddening and gas-phase metallicities: The CALIFA connection. Astronomy and Astrophysics. 2016 Jan 1;585:1-29. A47. https://doi.org/10.1051/0004-6361/201526986