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Metallicity gradients in nearby star forming galaxies

Published online by Cambridge University Press:  03 March 2020

Francesco Belfiore
Francesco Belfiore*
Affiliation:
University of California Observatories - Lick Observatory, University of California Santa Cruz, 1156 High St., Santa Cruz, CA95064, USA email: fbelfior@ucsc.edu
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Abstract

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I study the gas phase metallicity (O/H) radial profiles in a representative sample of 550 nearby star forming galaxies with resolved spectroscopic data from the SDSS-IV MaNGA survey. Using strong-line ratio diagnostics (R23 and O3N2) and referencing to the effective (half-light) radius (Re), I find that the metallicity gradient steepens with stellar mass going from log(M/Mȯ) = 9.0 to log(M/Mȯ) = 10.5. At higher masses a flattening of the metallicity radial profile is observed in the central regions (R < 1Re). These findings are in agreement with recent independent analysis of other large samples of nearby galaxies.

Keywords

galaxies: abundancesgalaxies: ISMgalaxies: evolution
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 14 , Symposium A30: Astronomy in Focus XXX , August 2018 , pp. 249 - 250
Copyright
© International Astronomical Union 2020

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