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IMF - metallicity: a tight local relation revealed by the CALIFA survey

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arxiv 1506.00638 v1 pith:RERUQ7M6 submitted 2015-06-01 astro-ph.GA

IMF - metallicity: a tight local relation revealed by the CALIFA survey

Ignacio Mart\'in-Navarro , Alexandre Vazdekis , Francesco La Barbera , Jes\'us Falc\'on-Barroso , Mariya Lyubenova , Glenn van de Ven , Ignacio Ferreras , S.F. S\'anchez
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S.C. Trager R. Garc\'ia-Benito D. Mast M.A. Mendoza P. S\'anchez-Bl\'azquez R. Gonz\'alez Delgado C.J. Walcher the CALIFA team
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keywords early-typegalaxiesgalaxylocalmetallicityrelationbeencalifa
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Variations in the stellar initial mass function (IMF) have been invoked to explain the spectroscopic and dynamical properties of early-type galaxies. However, no observations have yet been able to disentangle the physical driver. We analyse here a sample of 24 early-type galaxies drawn from the CALIFA survey, deriving in a homogeneous way their stellar population and kinematic properties. We find that the local IMF is tightly related to the local metallicity, becoming more bottom-heavy towards metal-rich populations. Our result, combined with the galaxy mass-metallicity relation, naturally explains previous claims of a galaxy mass-IMF relation, derived from non-IFU spectra. If we assume that - within the star formation environment of early-type galaxies - metallicity is the main driver of IMF variations, a significant revision of the interpretation of galaxy evolution observables is necessary.

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