期刊
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
卷 466, 期 4, 页码 4731-4758出版社
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stw3371
关键词
galaxies: elliptical and lenticular; cD; galaxies: evolution; galaxies: formation; galaxies: spiral; galaxies: star formation; galaxies: stellar content
资金
- STFC PhD studentship
- NSF [AST-1517006]
- Leverhulme Early Career Fellowship
- CNPq
- Fapergs
- Science and Technology Facilities Council (STFC)
- ERC 'QUENCH' [695671]
- Institute of Cosmology of Gravitation
- SEPNet
- University of Portsmouth
- Alfred P. Sloan Foundation
- U.S. Department of Energy Office of Science
- Center for High-Performance Computing at the University of Utah
- [RSCF-14-22-00041]
- Science and Technology Facilities Council [ST/M001172/1, ST/N000668/1] Funding Source: researchfish
- STFC [ST/N000668/1, ST/L000695/1, ST/M001172/1] Funding Source: UKRI
- Division Of Astronomical Sciences
- Direct For Mathematical & Physical Scien [1517006] Funding Source: National Science Foundation
We study the internal gradients of stellar population propertieswithin 1.5 R-e for a representative sample of 721 galaxies, with stellar masses ranging between 10(9)M circle dot and 10(11.5)M circle dot from the SDSS-IV MaNGA Integral-Field-Unit survey. Through the use of our full spectral fitting code FIREFLY, we derive light-and mass-weighted stellar population properties and their radial gradients, as well as full star formation and metal enrichment histories. We also quantify the impact that different stellar population models and full spectral fitting routines have on the derived stellar population properties and the radial gradient measurements. In our analysis, we find that age gradients tend to be shallow for both early-type and late-type galaxies. Mass-weighted age gradients of early-types arepositive (similar to 0.09 dex/Re) pointing to ` outsidein' progression of star formation, while late-type galaxies have negative light-weighted age gradients (similar to-0.11 dex/R-e), suggesting an ` inside-out' formation of discs. We detect negative metallicity gradients in both early-and late-type galaxies, but these are significantly steeper in late-types, suggesting that the radial dependence of chemical enrichment processes and the effect of gas inflow and metal transport are far more pronounced in discs. Metallicity gradients of both morphological classes correlate with galaxy mass, with negative metallicity gradients becoming steeper with increasing galaxy mass. The correlation with mass is stronger for late-type galaxies, with a slope of d(del[Z/H])/d(logM) similar to -0.2 +/- 0.05, compared to d(del[Z/H])/d(logM) similar to -0.05 +/- 0.05 for early-types. This result suggests that the merger history plays a relatively small role in shaping metallicity gradients of galaxies.
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