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          Institute: MPI für Astronomie     Collection: Publikationen_mpia     Display Documents



ID: 730109.0, MPI für Astronomie / Publikationen_mpia
IMF–METALLICITY: A tight local relation revealed by the CALIFA survey
Authors:Martín-Navarro, I.; Vazdekis, A.; La Barbera, F.; Falcón-Barroso, J.; Lyubenova, M.; van de Ven, G.; Ferreras, I.; Sánchez, S. F.; Trager, S. C.; García-Benito, R.; Mast, D.; Mendoza, M. A.; Sánchez-Blázquez, P.; González Delgado, R.; Walcher, C. J.; Team, T. C.
Date of Publication (YYYY-MM-DD):2015
Title of Journal:The Astrophysical Journal Letters
Volume:806
Issue / Number:2
Start Page:id. L31 (5 pp)
Audience:Not Specified
Abstract / Description: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.
Free Keywords:galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: formation; galaxies: fundamental parameters; galaxies: stellar content
External Publication Status:published
Document Type:Article
Communicated by:N. N.
Affiliations:MPI für Astronomie
Identifiers:ISSN:0004-637X
URL:http://cdsads.u-strasbg.fr/abs/2015ApJ...806L..31M
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