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|Title:||IMF-Metallicity: A Tight Local Relation Revealed by the CALIFA Survey||Authors:||Martín-Navarro, Ignacio
LA BARBERA, Francesco
van de Ven, Glenn
Sánchez, S. F.
Trager, S. C.
Mendoza, M. A.
González Delgado, R.
Walcher, C. J.
|Issue Date:||2015||Journal:||THE ASTROPHYSICAL JOURNAL LETTERS||Number:||806||Issue:||2||First Page:||L31||Abstract:||Variations in the stellar initial mass function (IMF) have been invoked to explain the spectroscopic and dynamical properties of early-type galaxies (ETGs). However, no observations have yet been able to disentangle the physical driver. We analyze here a sample of 24 ETGs 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 toward 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 ETGs—metallicity is the main driver of IMF variations, a significant revision of the interpretation of galaxy evolution observables is necessary.||Acknowledgments:||We acknowledge support from grants AYA2013-48226-C3-1 P and AYA2010-15081 from the Spanish MINECO. C.J.W. acknowledges support through the Marie Curie Career Integration Grant 303912. P.S.-B. acknowledges support from the Ramón y Cajal program, ATA2010-21322-C03-02 (MINECO). J.F.B. and Gvd.V. acknowledge the DAGAL network from the People Programme (Marie Curie Actions) of the European Unions Seventh Framework Programme FP7/2007–2013 under REA grant agreement number PITN-GA-2011-289313.||URI:||http://hdl.handle.net/20.500.12386/26190||URL:||https://iopscience.iop.org/article/10.1088/2041-8205/806/2/L31||ISSN:||2041-8205||DOI:||10.1088/2041-8205/806/2/L31||Bibcode ADS:||2015ApJ...806L..31M||Fulltext:||open|
|Appears in Collections:||1.01 Articoli in rivista|
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