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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents

ID: 709853.0, MPI für Astronomie / Publikationen_mpia
Insights on the stellar mass-metallicity relation from the CALIFA survey
Authors:González Delgado, R. M.; Cid Fernandes, R.; García-Benito, R.; Pérez, E.; de Amorim, A. L.; Cortijo-Ferrero, C.; Lacerda, E. A. D.; López Fernández, R.; Sánchez, S. F.; Vale Asari, N.; Alves, J.; Bland-Hawthorn, J.; Galbany, L.; Gallazzi, A.; Husemann, B.; Bekeraite, S.; Jungwiert, B.; López-Sánchez, A. R.; de Lorenzo-Cáceres, A.; Marino, R. A.; Mast, D.; Mollá, M.; del Olmo, A.; Sánchez-Blázquez, P.; van de Ven, G.; Vílchez, J. M.; Walcher, C. J.; Wisotzki, L.; Ziegler, B.; Collaboration920, C.
Date of Publication (YYYY-MM-DD):2014
Title of Journal:The Astrophysical Journal Letters
Issue / Number:1
Start Page:id. L16 (5 pp)
Audience:Not Specified
Abstract / Description: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 sstarf) relates to the total stellar mass (M sstarf) and the local mass surface density (musstarf) 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 &sun; 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 musstarf and Z sstarf (the muZR), betraying the influence of local factors in determining Z sstarf. This shows that both local (musstarf-driven) and global (M sstarf-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, musstarf regulates Z sstarf, producing a strong muZR whose amplitude is modulated by M sstarf. In spheroids it is M sstarf that dominates the physics of star formation and chemical enrichment, with musstarf 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.
Free Keywords:galaxies: evolution; galaxies: fundamental parameters; galaxies: stellar content; galaxies: structure
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X %R 10.1088/2041-8205/791/1/L16
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