%0 Generic %1 martinnavarro2015metallicity %A Martín-Navarro, Ignacio %A Vazdekis, Alexandre %A La Barbera, Francesco %A Falcón-Barroso, Jesús %A Lyubenova, Mariya %A van de Ven, Glenn %A Ferreras, Ignacio %A Sánchez, S. F. %A Trager, S. C. %A García-Benito, R. %A Mast, D. %A Mendoza, M. A. %A Sánchez-Blázquez, P. %A Delgado, R. González %A Walcher, C. J. %A team, the CALIFA %D 2015 %K ifu imf metallicity variation %T IMF - metallicity: a tight local relation revealed by the CALIFA survey %U http://arxiv.org/abs/1506.00638 %X 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.

@misc{martinnavarro2015metallicity, abstract = {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.}, added-at = {2015-06-03T10:22:15.000+0200}, author = {Martín-Navarro, Ignacio and Vazdekis, Alexandre and La Barbera, Francesco and Falcón-Barroso, Jesús and Lyubenova, Mariya and van de Ven, Glenn and Ferreras, Ignacio and Sánchez, S. F. and Trager, S. C. and García-Benito, R. and Mast, D. and Mendoza, M. A. and Sánchez-Blázquez, P. and Delgado, R. González and Walcher, C. J. and team, the CALIFA}, biburl = {https://www.bibsonomy.org/bibtex/2bdeac74e5b9f47af795522a5588f13ee/miki}, description = {[1506.00638] IMF - metallicity: a tight local relation revealed by the CALIFA survey}, interhash = {20e7381d89dbad33d06ae34f5c538de7}, intrahash = {bdeac74e5b9f47af795522a5588f13ee}, keywords = {ifu imf metallicity variation}, note = {cite arxiv:1506.00638Comment: Accepted for publication in ApJL. 6 pages, 4 figures}, timestamp = {2015-06-03T10:22:15.000+0200}, title = {IMF - metallicity: a tight local relation revealed by the CALIFA survey}, url = {http://arxiv.org/abs/1506.00638}, year = 2015 }