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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
earth and planetary sciences
SDSS-IV MaNGA: Spatially resolved star formation histories in galaxies as a function of galaxy mass and type
Monthly Notices of the Royal Astronomical Society, Volume 466, No. 4, Year 2017
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Description
We study the internal gradients of stellar population propertieswithin 1.5 Re for a representative sample of 721 galaxies, with stellar masses ranging between 109M⊙ and 1011.5M⊙ 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 (~0.09 dex/Re) pointing to 'outside- in' progression of star formation, while late-type galaxies have negative light-weighted age gradients (~-0.11 dex/Re), 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(∇[Z/H])/d(logM) ~ -0.2 ± 0.05, compared to d(∇[Z/H])/d(logM) ~ -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. © 2016 The Authors.
Authors & Co-Authors
Thomas, Daniel B.
United Kingdom, Portsmouth
University of Portsmouth
Maraston, Claudia
United Kingdom, Portsmouth
University of Portsmouth
Westfall, Kyle B.
United Kingdom, Portsmouth
University of Portsmouth
Etherington, James
United Kingdom, Portsmouth
University of Portsmouth
Riffel, Rogério
Brazil, Porto Alegre
Universidade Federal do Rio Grande do Sul
Brazil, Rio de Janeiro
Laboratório Interinstitucional de E-astronomia
Zheng, Zheng
China, Beijing
Chinese Academy of Sciences
Argudo-Fernández, M.
Chile, Antofagasta
Universidad de Antofagasta
Lian, Jianhui
United Kingdom, Portsmouth
University of Portsmouth
Bershady, Matthew A.
United States, Madison
University of Wisconsin-madison
Bundy, Kevin A.
Japan, Tokyo
The University of Tokyo
Drory, Niv
United States, Austin
The University of Texas at Austin
Law, David R.
United States, Baltimore
Space Telescope Science Institute
Yan, Renbin
United States, Lexington
University of Kentucky
Wake, David A.
United States, Madison
University of Wisconsin-madison
United Kingdom, Milton Keynes
The Open University
Weijmans, Anne Marie
United Kingdom, St Andrews
University of st Andrews
Bizyaev, Dmitry Anatolevich
United States, Sunspot
Apache Point Observatory
Brownstein, Joel R.
United States, Salt Lake City
The University of Utah
Lane, Richard R.
Chile, Santiago
Pontificia Universidad Católica de Chile
Maiolino, Roberto
United Kingdom, Cambridge
University of Cambridge
Masters, Karen L.
United Kingdom, Portsmouth
University of Portsmouth
Merrifield, Michael R.
United Kingdom, Nottingham
University of Nottingham
Nitschelm, Christian H.R.
Chile, Antofagasta
Universidad de Antofagasta
Pan, Kaike
United States, Sunspot
Apache Point Observatory
Roman-Lopes, Alexandre
Chile, La Serena
Universidad de la Serena
Storchi-Bergmann, Thaísa
Brazil, Porto Alegre
Universidade Federal do Rio Grande do Sul
Brazil, Rio de Janeiro
Laboratório Interinstitucional de E-astronomia
P. Schneider, Donald P.
United States, University Park
Pennsylvania State University
Statistics
Citations: 161
Authors: 26
Affiliations: 19
Identifiers
Doi:
10.1093/mnras/stw3371
ISSN:
00358711
Study Design
Cross Sectional Study
Study Approach
Quantitative