Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 514, Issue 2, Pages 2298-2314Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stac1475
Keywords
ISM: abundances; ISM: general; galaxies: general; galaxies: ISM; galaxies: statistics; galaxies: structure
Categories
Funding
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for HighPerformance Computing at the University of Utah
- DGAPA-PAPIIT, UNAM [IA-100420]
- CONACYT [CF19-39578]
- Conselho Nacional de Desenvolvimento Cient'ifico e Tecnologico (CNPq) [311223/2020-6, 304927/2017-1, 400352/20168]
- Fundacao de amparo 'a pesquisa do Rio Grande do Sul (FAPERGS) [16/2551-0000251-7, 19/1750-2]
- Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior (CAPES) [0001]
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico [302280/2019-7]
- Brazilian Participation Group
- Carnegie Institution for Science, Carnegie Mellon University
- Chilean Participation Group
- French Participation Group
- Harvard-Smithsonian Center for Astrophysics
- Instituto de Astrofisica de Canarias
- Johns Hopkins University
- Kavli Institute for the Physics and Mathematics of the Universe (IPMU)/University of Tokyo
- Lawrence Berkeley National Laboratory
- Leibniz Institut fur Astrophysik Potsdam (AIP)
- Max-Planck-Institut fur Astronomie (MPIA Heidelberg)
- Max-Planck-Institut fur Astrophysik (MPA Garching)
- Max-PlanckInstitut fur Extraterrestrische Physik (MPE)
- National Astronomical Observatories of China
- New Mexico State University
- New York University
- University of Notre Dame
- Observatario Nacional/MCTI
- Ohio State University
- Pennsylvania State University
- Shanghai Astronomical Observatory
- United Kingdom Participation Group
- Universidad Nacional Autonoma de Mexico
- University of Arizona
- University of Colorado Boulder
- University of Oxford
- University of Portsmouth
- University of Utah
- University of Virginia
- University of Washington
- University of Wisconsin
- Vanderbilt University
- Yale University
Ask authors/readers for more resources
Gas-phase metallicity gradients provide clues to the formation histories of galaxies, and the most extended galaxies display steeper gradients. By examining local relations, we can qualitatively predict the gradient behavior on the mass-size plane, but there are some discrepant gradients that need to be explained by physical causes.
Gas-phase metallicity gradients in galaxies provide important clues to those galaxies' formation histories. Using SDSS-IV MaNGA data, we previously demonstrated that gas metallicity gradients vary systematically and significantly across the galaxy mass-size plane: at stellar masses beyond approximately 10(10) M-circle dot, more extended galaxies display steeper gradients (in units of dex/R-e) at a given stellar mass. Here, we set out to develop a physical interpretation of these findings by examining the ability of local similar to kpc-scale relations to predict the gradient behaviour along the mass-size plane. We find that local stellar mass surface density, when combined with total stellar mass, is sufficient to reproduce the overall mass-size trend in a qualitative sense. We further find that we can improve the predictions by correcting for residual trends relating to the recent star formation histories of star-forming regions. However, we find as well that the most extended galaxies display steeper average gradients than predicted, even after correcting for residual metallicity trends with other local parameters. From these results, we argue that gas-phase metallicity gradients can largely be understood in terms of known local relations, but we also discuss some possible physical causes of discrepant gradients.
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