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

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...

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Detalles Bibliográficos
Autores: 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.
Tipo de recurso: artículo
Estado:Versión publicada
Fecha de publicación:2017
País:Brasil
Institución:Universidade Federal do Rio Grande do Sul (UFRGS)
Repositorio:Repositório Institucional da UFRGS
Idioma:inglés
OAI Identifier:oai:www.lume.ufrgs.br:10183/159777
Acceso en línea:http://hdl.handle.net/10183/159777
Access Level:acceso abierto
Palabra clave:Formacao de galaxias
Evolucao estelar
Populacoes estelares
Metalicidade
Mapeamentos astronômicos
Galaxies abundances
Galaxies evolution
Galaxies formation
Galaxies statistics
Galaxies stellar content
Galaxies structure
Descripción
Sumario: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.

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