From Erb's PPT (http://www2.astro.psu.edu/~caryl/a597/Bin_metallicity.pdf) |
The simple interpretation for the mass- dependence is a metal loss via galactic winds, where galaxies with shallow potential well have more efficient outflows.
The scatter observed in the MZ relation is correlated
with other physical properties. These correlations provide clues to the origin of the MZ relation.
Zahid et al. 2014 defined the "turnover mass" in the mass-Z relation, and found that the "turnover mass" revolves with redshift from local to z~1.6.
I list some paper about the relation and will give a simple review for this relations sometime.
CHEMICAL EVOLUTION OF THE ISM IN NEARBY GALAXIES
4.2. The Metallicity-Luminosity Relationship
The Universal Relation of Galactic Chemical Evolution: The Origin of the Mass-Metallicity Relation (Zahid 2014)
The MZ relation was first observed in a small sample of
nearby galaxies by Lequeux et al. (1979). They showed
that galaxy metallicity increases with stellar mass. Sub-
sequently, Tremonti et al. (2004) measure the MZ rela-
tion of ∼ 50, 000 star-forming galaxies in the local Uni-
verse. They find a tight MZ relation (∼0.1 dex scatter)
extending over three orders of magnitude in stellar mass.
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