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SDSS-IV MaNGA : environmental dependence of stellar age and metallicity gradients in nearby galaxies

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SDSS-IV MaNGA : environmental dependence of stellar age and metallicity gradients in nearby galaxies

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Título SDSS-IV MaNGA : environmental dependence of stellar age and metallicity gradients in nearby galaxies
Autor Zheng, Zheng
Wang, Huiyuan
Ge, Junqiang
Mao, Shude
Li, Cheng
Li, Ran
Mo, Houjun
Goddard, Daniel
Bundy, Kevin
Li, Hongyu
Nair, Preethi B.
Lin, Lihwai
Long, Richard J.
Riffel, Rogério
Thomas, D.
Masters, K.L.
Bizyaev, D.
Brownstein, Joel R.
Zhang, Kai
Law, David R.
Drory, Niv
Lopes, Alexandre Roman
Malanushenko, E.
Abstract We present a study on the stellar age and metallicity distributions for 1105 galaxies using the STARLIGHT software on MaNGA (Mapping Nearby Galaxies at APO) integral field spectra.We derive age and metallicity gradients by fitting straight lines to the radial profiles, and explore their correlations with total stellar mass M∗, NUV − r colour and environments, as identified by both the large-scale structure (LSS) type and the local density. We find that the mean age and metallicity gradients are close to zero but slightly negative, which is consistent with the inside-out formation scenario. Within our sample, we find that both the age and metallicity gradients show weak or no correlation with either the LSS type or local density environment. In addition, we also study the environmental dependence of age and metallicity values at the effective radii. The age and metallicity values are highly correlated with M∗ and NUV − r and are also dependent on LSS type as well as local density. Low-mass galaxies tend to be younger and have lower metallicity in low-density environments while high-mass galaxies are less affected by environment.
Contido em Monthly notices of the Royal Astronomical Society. Oxford. Vol. 465, no. 4 (Mar. 2017), p. 4572-4588
Assunto Evolucao estelar
Formacao de galaxias
Mapeamentos astronômicos
Metalicidade
Populacoes estelares
[en] Galaxies abundances
[en] Galaxies evolution
[en] Galaxies formation
[en] Galaxies statistics
[en] Galaxies stellar content
[en] Galaxies structure
Origem Estrangeiro
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/159777
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