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Impact of AGN and nebular emission on the estimation of stellar properties of galaxies

Leandro S. M. Cardoso


The study of galaxy formation and evolution using data from large-scale surveys relies to a large extent on an automated and robust application of spectral synthesis to derive physical properties of galaxies. However, most of the state-of-the-art codes used to decompose the galaxy optical spectrum into its elementary spectral components adopt mainly stellar ingredients. With this in mind, in this presentation we will investigate the impact of emission produced by an active galactic nucleus (AGN) and/or excited gas on the estimation of fundamental stellar properties of galaxies with currently available codes as a function, among others, cosmic time and star formation history. Subsequently, we will also see how the neglect of these non-stellar spectral components in the modelling can lead to an erroneous understanding of the formation and evolution of star-forming and/or active galaxies.

2017 May 30, 15:00

Observatório Astronómico de Lisboa (Seminar room)
Tapada da Ajuda, 1349-018 Lisboa

Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia