A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA

S. F. Sánchez, F. F. Rosales-Ortega, J. Iglesias-Páramo, M. Mollá, J. Barrera-Ballesteros, R. A. Marino, E. Pérez, P. Sánchez-Blazquez, R. González Delgado, R. Cid Fernandes, A. De Lorenzo-Cáceres, J. Mendez-Abreu, L. Galbany, J. Falcon-Barroso, D. Miralles-Caballero, B. Husemann, R. García-Benito, D. Mast, C. J. Walcher, A. Gil De Paz & 17 others B. García-Lorenzo, B. Jungwiert, J. M. Vílchez, Lucie Jílková, M. Lyubenova, C. Cortijo-Ferrero, A. I. Díaz, L. Wisotzki, I. Márquez, J. Bland-Hawthorn, S. Ellis, G. Van De Ven, K. Jahnke, P. Papaderos, J. M. Gomes, M. A. Mendoza, A. R. López-Sánchez

Research output: Contribution to journalArticleResearchpeer-review

Abstract

We present the largest and most homogeneous catalog of H ii regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxies observed by the CALIFA survey. We describe the procedures used to detect, select, and analyze the spectroscopic properties of these ionized regions. In the current study we focus on characterizing of the radial gradient of the oxygen abundance in the ionized gas, based on the study of the deprojecteddistribution of H ii regions. We found that all galaxies without clear evidence of an interaction present a common gradient in the oxygen abundance, with a characteristic slope of αO/H =-0.1 dex/re between 0.3 and 2 disk effective radii (re), and a scatter compatible with random fluctuations around this value, when the gradient is normalized to the disk effective radius. The slope is independent of morphology, the incidence of bars, absolute magnitude, or mass. Only those galaxies with evidence of interactions and/or clear merging systems present a significantly shallower gradient, consistent with previous results. The majority of the 94 galaxies with H ii regions detected beyond two disk effective radii present a flattening in the oxygen abundance. The flattening is statistically significant. We cannot provide a conclusive answer regarding the origin of this flattening. However, our results indicate that its origin is most probably related to the secular evolution of galaxies. Finally, we find a drop/truncation of the oxygen abundance in the inner regions for 26 of the galaxies. All of them are non-interacting, mostly unbarred Sb/Sbc galaxies. This feature is associated with a central star-forming ring, which suggests that both features are produced by radial gas flows induced by resonance processes. Our result suggests that galaxy disks grow inside-out, with metal enrichment driven by the local star formation history and with a small variation galaxy-by-galaxy. At a certain galactocentric distance, the oxygen abundance seems to be correlated well with the stellar mass density and total stellar mass of the galaxies, independently of other properties of the galaxies. Other processes, such as radial mixing and inflows/outflows seem to have a limited effect on shaping of the radial distribution of oxygen abundances, although they are not ruled out.

LanguageEnglish
Article numberA49
Pages1-25
Number of pages25
JournalAstronomy and Astrophysics
Volume563
DOIs
Publication statusPublished - Mar 2014
Externally publishedYes

Fingerprint

disk galaxies
galaxies
gradients
oxygen
flattening
radial flow
stellar mass
gas flow
radii
catalogs
inflow
outflow
slopes
ionized gases
metal
radial distribution
history
gas
star formation
incidence

Keywords

  • galaxies: abundances
  • galaxies: evolution
  • galaxies: ISM
  • galaxies: star formation
  • HII regions
  • ISM: abundances

Cite this

Sánchez, S. F., Rosales-Ortega, F. F., Iglesias-Páramo, J., Mollá, M., Barrera-Ballesteros, J., Marino, R. A., ... López-Sánchez, A. R. (2014). A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA. Astronomy and Astrophysics, 563, 1-25. [A49]. https://doi.org/10.1051/0004-6361/201322343
Sánchez, S. F. ; Rosales-Ortega, F. F. ; Iglesias-Páramo, J. ; Mollá, M. ; Barrera-Ballesteros, J. ; Marino, R. A. ; Pérez, E. ; Sánchez-Blazquez, P. ; González Delgado, R. ; Cid Fernandes, R. ; De Lorenzo-Cáceres, A. ; Mendez-Abreu, J. ; Galbany, L. ; Falcon-Barroso, J. ; Miralles-Caballero, D. ; Husemann, B. ; García-Benito, R. ; Mast, D. ; Walcher, C. J. ; Gil De Paz, A. ; García-Lorenzo, B. ; Jungwiert, B. ; Vílchez, J. M. ; Jílková, Lucie ; Lyubenova, M. ; Cortijo-Ferrero, C. ; Díaz, A. I. ; Wisotzki, L. ; Márquez, I. ; Bland-Hawthorn, J. ; Ellis, S. ; Van De Ven, G. ; Jahnke, K. ; Papaderos, P. ; Gomes, J. M. ; Mendoza, M. A. ; López-Sánchez, A. R. / A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA. In: Astronomy and Astrophysics. 2014 ; Vol. 563. pp. 1-25.
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title = "A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA",
abstract = "We present the largest and most homogeneous catalog of H ii regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxies observed by the CALIFA survey. We describe the procedures used to detect, select, and analyze the spectroscopic properties of these ionized regions. In the current study we focus on characterizing of the radial gradient of the oxygen abundance in the ionized gas, based on the study of the deprojecteddistribution of H ii regions. We found that all galaxies without clear evidence of an interaction present a common gradient in the oxygen abundance, with a characteristic slope of αO/H =-0.1 dex/re between 0.3 and 2 disk effective radii (re), and a scatter compatible with random fluctuations around this value, when the gradient is normalized to the disk effective radius. The slope is independent of morphology, the incidence of bars, absolute magnitude, or mass. Only those galaxies with evidence of interactions and/or clear merging systems present a significantly shallower gradient, consistent with previous results. The majority of the 94 galaxies with H ii regions detected beyond two disk effective radii present a flattening in the oxygen abundance. The flattening is statistically significant. We cannot provide a conclusive answer regarding the origin of this flattening. However, our results indicate that its origin is most probably related to the secular evolution of galaxies. Finally, we find a drop/truncation of the oxygen abundance in the inner regions for 26 of the galaxies. All of them are non-interacting, mostly unbarred Sb/Sbc galaxies. This feature is associated with a central star-forming ring, which suggests that both features are produced by radial gas flows induced by resonance processes. Our result suggests that galaxy disks grow inside-out, with metal enrichment driven by the local star formation history and with a small variation galaxy-by-galaxy. At a certain galactocentric distance, the oxygen abundance seems to be correlated well with the stellar mass density and total stellar mass of the galaxies, independently of other properties of the galaxies. Other processes, such as radial mixing and inflows/outflows seem to have a limited effect on shaping of the radial distribution of oxygen abundances, although they are not ruled out.",
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Sánchez, SF, Rosales-Ortega, FF, Iglesias-Páramo, J, Mollá, M, Barrera-Ballesteros, J, Marino, RA, Pérez, E, Sánchez-Blazquez, P, González Delgado, R, Cid Fernandes, R, De Lorenzo-Cáceres, A, Mendez-Abreu, J, Galbany, L, Falcon-Barroso, J, Miralles-Caballero, D, Husemann, B, García-Benito, R, Mast, D, Walcher, CJ, Gil De Paz, A, García-Lorenzo, B, Jungwiert, B, Vílchez, JM, Jílková, L, Lyubenova, M, Cortijo-Ferrero, C, Díaz, AI, Wisotzki, L, Márquez, I, Bland-Hawthorn, J, Ellis, S, Van De Ven, G, Jahnke, K, Papaderos, P, Gomes, JM, Mendoza, MA & López-Sánchez, AR 2014, 'A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA', Astronomy and Astrophysics, vol. 563, A49, pp. 1-25. https://doi.org/10.1051/0004-6361/201322343

A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA. / Sánchez, S. F.; Rosales-Ortega, F. F.; Iglesias-Páramo, J.; Mollá, M.; Barrera-Ballesteros, J.; Marino, R. A.; Pérez, E.; Sánchez-Blazquez, P.; González Delgado, R.; Cid Fernandes, R.; De Lorenzo-Cáceres, A.; Mendez-Abreu, J.; Galbany, L.; Falcon-Barroso, J.; Miralles-Caballero, D.; Husemann, B.; García-Benito, R.; Mast, D.; Walcher, C. J.; Gil De Paz, A.; García-Lorenzo, B.; Jungwiert, B.; Vílchez, J. M.; Jílková, Lucie; Lyubenova, M.; Cortijo-Ferrero, C.; Díaz, A. I.; Wisotzki, L.; Márquez, I.; Bland-Hawthorn, J.; Ellis, S.; Van De Ven, G.; Jahnke, K.; Papaderos, P.; Gomes, J. M.; Mendoza, M. A.; López-Sánchez, A. R.

In: Astronomy and Astrophysics, Vol. 563, A49, 03.2014, p. 1-25.

Research output: Contribution to journalArticleResearchpeer-review

TY - JOUR

T1 - A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA

AU - Sánchez, S. F.

AU - Rosales-Ortega, F. F.

AU - Iglesias-Páramo, J.

AU - Mollá, M.

AU - Barrera-Ballesteros, J.

AU - Marino, R. A.

AU - Pérez, E.

AU - Sánchez-Blazquez, P.

AU - González Delgado, R.

AU - Cid Fernandes, R.

AU - De Lorenzo-Cáceres, A.

AU - Mendez-Abreu, J.

AU - Galbany, L.

AU - Falcon-Barroso, J.

AU - Miralles-Caballero, D.

AU - Husemann, B.

AU - García-Benito, R.

AU - Mast, D.

AU - Walcher, C. J.

AU - Gil De Paz, A.

AU - García-Lorenzo, B.

AU - Jungwiert, B.

AU - Vílchez, J. M.

AU - Jílková, Lucie

AU - Lyubenova, M.

AU - Cortijo-Ferrero, C.

AU - Díaz, A. I.

AU - Wisotzki, L.

AU - Márquez, I.

AU - Bland-Hawthorn, J.

AU - Ellis, S.

AU - Van De Ven, G.

AU - Jahnke, K.

AU - Papaderos, P.

AU - Gomes, J. M.

AU - Mendoza, M. A.

AU - López-Sánchez, A. R.

PY - 2014/3

Y1 - 2014/3

N2 - We present the largest and most homogeneous catalog of H ii regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxies observed by the CALIFA survey. We describe the procedures used to detect, select, and analyze the spectroscopic properties of these ionized regions. In the current study we focus on characterizing of the radial gradient of the oxygen abundance in the ionized gas, based on the study of the deprojecteddistribution of H ii regions. We found that all galaxies without clear evidence of an interaction present a common gradient in the oxygen abundance, with a characteristic slope of αO/H =-0.1 dex/re between 0.3 and 2 disk effective radii (re), and a scatter compatible with random fluctuations around this value, when the gradient is normalized to the disk effective radius. The slope is independent of morphology, the incidence of bars, absolute magnitude, or mass. Only those galaxies with evidence of interactions and/or clear merging systems present a significantly shallower gradient, consistent with previous results. The majority of the 94 galaxies with H ii regions detected beyond two disk effective radii present a flattening in the oxygen abundance. The flattening is statistically significant. We cannot provide a conclusive answer regarding the origin of this flattening. However, our results indicate that its origin is most probably related to the secular evolution of galaxies. Finally, we find a drop/truncation of the oxygen abundance in the inner regions for 26 of the galaxies. All of them are non-interacting, mostly unbarred Sb/Sbc galaxies. This feature is associated with a central star-forming ring, which suggests that both features are produced by radial gas flows induced by resonance processes. Our result suggests that galaxy disks grow inside-out, with metal enrichment driven by the local star formation history and with a small variation galaxy-by-galaxy. At a certain galactocentric distance, the oxygen abundance seems to be correlated well with the stellar mass density and total stellar mass of the galaxies, independently of other properties of the galaxies. Other processes, such as radial mixing and inflows/outflows seem to have a limited effect on shaping of the radial distribution of oxygen abundances, although they are not ruled out.

AB - We present the largest and most homogeneous catalog of H ii regions and associations compiled so far. The catalog comprises more than 7000 ionized regions, extracted from 306 galaxies observed by the CALIFA survey. We describe the procedures used to detect, select, and analyze the spectroscopic properties of these ionized regions. In the current study we focus on characterizing of the radial gradient of the oxygen abundance in the ionized gas, based on the study of the deprojecteddistribution of H ii regions. We found that all galaxies without clear evidence of an interaction present a common gradient in the oxygen abundance, with a characteristic slope of αO/H =-0.1 dex/re between 0.3 and 2 disk effective radii (re), and a scatter compatible with random fluctuations around this value, when the gradient is normalized to the disk effective radius. The slope is independent of morphology, the incidence of bars, absolute magnitude, or mass. Only those galaxies with evidence of interactions and/or clear merging systems present a significantly shallower gradient, consistent with previous results. The majority of the 94 galaxies with H ii regions detected beyond two disk effective radii present a flattening in the oxygen abundance. The flattening is statistically significant. We cannot provide a conclusive answer regarding the origin of this flattening. However, our results indicate that its origin is most probably related to the secular evolution of galaxies. Finally, we find a drop/truncation of the oxygen abundance in the inner regions for 26 of the galaxies. All of them are non-interacting, mostly unbarred Sb/Sbc galaxies. This feature is associated with a central star-forming ring, which suggests that both features are produced by radial gas flows induced by resonance processes. Our result suggests that galaxy disks grow inside-out, with metal enrichment driven by the local star formation history and with a small variation galaxy-by-galaxy. At a certain galactocentric distance, the oxygen abundance seems to be correlated well with the stellar mass density and total stellar mass of the galaxies, independently of other properties of the galaxies. Other processes, such as radial mixing and inflows/outflows seem to have a limited effect on shaping of the radial distribution of oxygen abundances, although they are not ruled out.

KW - galaxies: abundances

KW - galaxies: evolution

KW - galaxies: ISM

KW - galaxies: star formation

KW - HII regions

KW - ISM: abundances

UR - http://www.scopus.com/inward/record.url?scp=84896772171&partnerID=8YFLogxK

U2 - 10.1051/0004-6361/201322343

DO - 10.1051/0004-6361/201322343

M3 - Article

VL - 563

SP - 1

EP - 25

JO - Astronomy and Astrophysics

T2 - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

SN - 0004-6361

M1 - A49

ER -

Sánchez SF, Rosales-Ortega FF, Iglesias-Páramo J, Mollá M, Barrera-Ballesteros J, Marino RA et al. A characteristic oxygen abundance gradient in galaxy disks unveiled with CALIFA. Astronomy and Astrophysics. 2014 Mar;563:1-25. A49. https://doi.org/10.1051/0004-6361/201322343