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SDSS-IV MaNGA : stellar population gradients as a function of galaxy environment

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SDSS-IV MaNGA : stellar population gradients as a function of galaxy environment

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Título SDSS-IV MaNGA : stellar population gradients as a function of galaxy environment
Autor Goddard, Daniel
Thomas, D.
Maraston, Claudia
Westfall, Kyle B.
Etherington, James
Riffel, Rogério
Mallmann, Nícolas Dullius
Zheng, Zheng
Argudo-Fernández, Maria
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
Abstract We study the internal radial gradients of stellar population properties within 1.5 Re and analyse the impact of galaxy environment.We use a representative sample of 721 galaxies with masses ranging between 109M and 1011.5M from the SDSS-IV survey MaNGA. We split this sample by morphology into early-type and late-type galaxies. Using the full spectral fitting code FIREFLY, we derive the light and mass-weighted stellar population properties, age and metallicity, and calculate the gradients of these properties.We use three independent methods to quantify galaxy environment, namely the Nth nearest neighbour, the tidal strength parameter Q and distinguish between central and satellite galaxies. In our analysis, we find that early-type galaxies generally exhibit shallowlight-weighted age gradients in agreement with the literature and mass-weighted median age gradients tend to be slightly positive. Late-type galaxies, instead, have negative light-weighted age gradients. We detect negative metallicity gradients in both early- and late-type galaxies that correlate with galaxy mass, with the gradients being steeper and the correlation with mass being stronger in late-types.We find, however, that stellar population gradients, for both morphological classifications, have no significant correlation with galaxy environment for all three characterizations of environment. Our results suggest that galaxy mass is the main driver of stellar population gradients in both early and late-type galaxies, and any environmental dependence, if present at all, must be very subtle.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 465, no. 1 (Feb. 2017), p. 688–700
Assunto Formacao de estrelas
Galaxias seyfert
Mapeamentos astronômicos
Metalicidade
Populacoes estelares
[en] Galaxies: elliptical and lenticular
[en] Galaxies: evolution
[en] Galaxies: formation
[en] Galaxies: spiral
[en] Galaxies: stellar content
[en] Surveys
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/164972
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