SDSS-IV MaNGA: drivers of stellar metallicity in nearby galaxies

ABSTRACT The distribution of stellar metallicities within and across galaxies is an excellent relic of the chemical evolution across cosmic time. We present a detailed analysis of spatially resolved stellar populations based on >2.6 million spatial bins from 7439 nearby galaxies in the Sloan Digi...

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Veröffentlicht in:Monthly notices of the Royal Astronomical Society 2021-12, Vol.508 (4), p.4844-4857
Hauptverfasser: Neumann, Justus, Thomas, Daniel, Maraston, Claudia, Goddard, Daniel, Lian, Jianhui, Hill, Lewis, Domínguez Sánchez, Helena, Bernardi, Mariangela, Margalef-Bentabol, Berta, Barrera-Ballesteros, Jorge K, Bizyaev, Dmitry, Boardman, Nicholas F, Drory, Niv, Fernández-Trincado, José G, Lane, Richard
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container_end_page 4857
container_issue 4
container_start_page 4844
container_title Monthly notices of the Royal Astronomical Society
container_volume 508
creator Neumann, Justus
Thomas, Daniel
Maraston, Claudia
Goddard, Daniel
Lian, Jianhui
Hill, Lewis
Domínguez Sánchez, Helena
Bernardi, Mariangela
Margalef-Bentabol, Berta
Barrera-Ballesteros, Jorge K
Bizyaev, Dmitry
Boardman, Nicholas F
Drory, Niv
Fernández-Trincado, José G
Lane, Richard
description ABSTRACT The distribution of stellar metallicities within and across galaxies is an excellent relic of the chemical evolution across cosmic time. We present a detailed analysis of spatially resolved stellar populations based on >2.6 million spatial bins from 7439 nearby galaxies in the Sloan Digital Sky Survey-IV (SDSS-IV) Mapping Nearby Galaxies at APO (MaNGA) survey. To account for accurate inclination corrections, we derive an equation for morphology-dependent determination of galaxy inclinations. Our study goes beyond the well-known global mass–metallicity relation and radial metallicity gradients by providing a statistically sound exploration of local relations between stellar metallicity [Z/H], stellar surface mass density Σ⋆, and galactocentric distance in the global mass–morphology plane. We find a significant resolved mass density–metallicity relation $r\Sigma _\star ZR$ for galaxies of all types and masses above $10^{9.8}\, \mathrm{M_\odot }$. Different radial distances make an important contribution to the spread of the relation. Particularly, in low- and intermediate-mass galaxies, we find that at fixed Σ⋆ metallicity increases with radius independently of morphology. For high masses, this radial dependence is only observed in high Σ⋆ regions of spiral galaxies. This result calls for a driver of metallicity, in addition to Σ⋆ that promotes chemical enrichment in the outer parts of galaxies more strongly than in the inner parts. We discuss gas accretion, outflows, recycling, and radial migration as possible scenarios.
doi_str_mv 10.1093/mnras/stab2868
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We find a significant resolved mass density–metallicity relation $r\Sigma _\star ZR$ for galaxies of all types and masses above $10^{9.8}\, \mathrm{M_\odot }$. Different radial distances make an important contribution to the spread of the relation. Particularly, in low- and intermediate-mass galaxies, we find that at fixed Σ⋆ metallicity increases with radius independently of morphology. For high masses, this radial dependence is only observed in high Σ⋆ regions of spiral galaxies. This result calls for a driver of metallicity, in addition to Σ⋆ that promotes chemical enrichment in the outer parts of galaxies more strongly than in the inner parts. 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subjects abundances
ASTRONOMY AND ASTROPHYSICS
evolution
galaxies
spectroscopic
statistics
stellar content
techniques
title SDSS-IV MaNGA: drivers of stellar metallicity in nearby galaxies
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