Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 756, Issue 2, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/2041-8205/756/2/L31
Keywords
galaxies: abundances; galaxies: fundamental parameters; galaxies: ISM; galaxies: stellar content; techniques: imaging spectroscopy
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Funding
- Mexican National Council for Science and Technology (CONACYT) under the program Estancias Postdoctorales y Sabaticas al Extranjero para la Consolidacion de Grupos de Investigacion
- Spanish Plan Nacional de Astronomia program [AYA2010-21887 C04-03]
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We demonstrate the existence of a local mass, metallicity, star formation relation using spatially resolved optical spectroscopy of H II regions in the local universe. One of the projections of this distribution-the local mass-metallicity relation-extends over a wide range in this parameter space: three orders of magnitude in mass and a factor of eight in metallicity. We explain the new relation as the combined effect of the differential distributions of mass and metallicity in the disks of galaxies, and a selective star formation efficiency. We use this local relation to reproduce-with a noticeable agreement-the mass-metallicity relation seen in galaxies, and conclude that the latter is a scale-up integrated effect of a local relation, supporting the inside-out growth and downsizing scenarios of galaxy evolution.
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