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SDSS-IV MaNGA : spatially resolved star formation histories in galaxies as a function of galaxy mass and type

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SDSS-IV MaNGA : spatially resolved star formation histories in galaxies as a function of galaxy mass and type

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Título SDSS-IV MaNGA : spatially resolved star formation histories in galaxies as a function of galaxy mass and type
Autor Goddard, Daniel
Thomas, D.
Maraston, Claudia
Westfall, Kyle B.
Etherington, James
Riffel, Rogério
Mallmann, Nícolas Dullius
Zheng, Zheng
Argudo-Fernández, Maria
Lian, Jianhui
Bershady, Matthew A.
Bundy, Kevin
Drory, Niv
Law, David R.
Yan, Renbin
Wake, D.A.
Weijmans, Anne Marie
Bizyaev, D.
Brownstein, Joel R.
Lane, Richard R.
Maiolino, Roberto
Masters, K.L.
Merrifield, Michael
Nitschelm, Christian
Pan, K.
Roman-Lopes, Alexandre
Storchi-Bergmann, Thaisa
Schneider, D.P.
Abstract 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.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 466, no. 4 (May 2017), p. 4731–4758
Assunto Formacao de galaxias
Galaxias elipticas
Mapeamentos astronômicos
Populacoes estelares
[en] Galaxies: elliptical and lenticular CD
[en] Galaxies: evolution
[en] Galaxies: formation
[en] Galaxies: spiral
[en] Galaxies: star formation
[en] Galaxies: stellar content
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/168974
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