Insights on the stellar mass-metallicity relation from the califa survey

R. M. González Delgado, R. Cid Fernandes, R. García-Benito, E. Pérez, A. L. De Amorim, C. Cortijo-Ferrero, E. A D Lacerda, R. López Fernández, S. F. Sánchez, N. Vale Asari, J. Alves, J. Bland-Hawthorn, L. Galbany, A. Gallazzi, B. Husemann, S. Bekeraite, B. Jungwiert, A. R. López-Sánchez, A. De Lorenzo-Cáceres, R. A. Marino & 9 others D. Mast, M. Mollá, A. Del Olmo, P. Sánchez-Blázquez, G. Van De Ven, J. M. Vílchez, C. J. Walcher, L. Wisotzki, B. Ziegler

Research output: Contribution to journalArticle

59 Citations (Scopus)

Abstract

We use spatially and temporally resolved maps of stellar population properties of 300 galaxies from the CALIFA integral field survey to investigate how the stellar metallicity (Z *) relates to the total stellar mass (M *) and the local mass surface density (μ*) in both spheroidal- and disk-dominated galaxies. The galaxies are shown to follow a clear stellar mass-metallicity relation (MZR) over the whole 109-1012 M⊙ range. This relation is steeper than the one derived from nebular abundances, which is similar to the flatter stellar MZR derived when we consider only young stars. We also find a strong relation between the local values of μ* and Z * (the μZR), betraying the influence of local factors in determining Z *. This shows that both local (μ*-driven) and global (M *-driven) processes are important in determining metallicity in galaxies. We find that the overall balance between local and global effects varies with the location within a galaxy. In disks, μ* regulates Z *, producing a strong μZR whose amplitude is modulated by M *. In spheroids it is M * that dominates the physics of star formation and chemical enrichment, with μ* playing a minor, secondary role. These findings agree with our previous analysis of the star formation histories of CALIFA galaxies, which showed that mean stellar ages are mainly governed by surface density in galaxy disks and by total mass in spheroids.

Original languageEnglish
Article numberL16
Pages (from-to)1-5
Number of pages5
JournalAstrophysical Journal Letters
Volume791
Issue number1
DOIs
Publication statusPublished - 10 Aug 2014
Externally publishedYes

Keywords

  • galaxies: evolution
  • galaxies: fundamental parameters
  • galaxies: stellar content
  • galaxies: structure

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