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SDSS-IV MaNGA: The radial distribution of physical properties within galaxies in the nearby universe

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arxiv 2206.07058 v1 pith:OODFMKQK submitted 2022-06-14 astro-ph.GA

SDSS-IV MaNGA: The radial distribution of physical properties within galaxies in the nearby universe

classification astro-ph.GA
keywords propertiesstellarradialdistributionglobalgradientsthosecontinuum
verification ladder T0 review T1 audit T2 compute T3 formal T4 reserved
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Using the largest sample of galaxies observed with an optical integral field unit (IFU, the SDSS-IV MaNGA survey, $\sim$10000 targets), we derive the radial distribution of the physical properties obtained from the stellar continuum and the ionized-gas emission lines. Given the large sample, we are able to explore the impact of the total stellar mass and morphology by averaging those radial distributions for different bins of both global properties. We use a piece-wise analysis to characterize the slopes of the gradients from those properties at different galactocentric distances. In general we find that most of the properties -- derived from both the stellar continuum and the ionized gas emission lines -- exhibit a negative gradient with a secondary impact by global properties such as the total stellar mass or morphology. Our results confirm the intimate interplay between the properties of the stellar component and those of the ionized gas at local (kpc) scales in order to set the observed gradients. Furthermore, the resemblance of the gradients for similar global properties (in particular for the stellar parameters) indicates statistical similar histories of star formation and chemical enrichment with an initial radial gas distribution following the potential of the galaxy.

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