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Recovering the origin of the lenticular galaxy NGC3115 using multi-band photometry

Published online by Cambridge University Press:  29 March 2021

Maria Luísa Buzzo Open the ORCID record for Maria Luísa Buzzo [Opens in a new window] ,
Arianna Cortesi ,
Ariel Werle Open the ORCID record for Ariel Werle [Opens in a new window]  and
Claudia Mendes de Oliveira
Maria Luísa Buzzo
Affiliation:
Universidade de São Paulo, IAG, Rua do Matão 1226, São Paulo, Brazil
Arianna Cortesi
Affiliation:
Universidade de São Paulo, IAG, Rua do Matão 1226, São Paulo, Brazil Observatório do Valongo, Ladeira do Pedro Antônio 43, Rio de Janeiro, RJ, Brazil
Ariel Werle
Affiliation:
Universidade de São Paulo, IAG, Rua do Matão 1226, São Paulo, Brazil INAF - Osservatorio Astronomico di Padova, Vicolo dell’Osservatorio 5, I-35122 Padova, Italy
Claudia Mendes de Oliveira
Affiliation:
Universidade de São Paulo, IAG, Rua do Matão 1226, São Paulo, Brazil
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Abstract

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We perform simultaneous multi-band fitting, using the routine GALFITM, of the galaxy NGC3115, in order to recover the stellar populations of its main components (a bulge, a thin disc and a thick disc). We model 11 bands, from ultraviolet to infrared, in order to take into account the galaxy younger stellar population and the presence of the Active Galactic Nuclei (AGN). We find that the majority of the galaxy baryonic mass belongs to the thick disc, which is also the oldest galaxy component, consistent with results from the literature. Differently from previous works, we find that the bulge has the bluest colour and it is younger than the thick disc, either as a result of recent star formation activity, or AGN feedback, or white dwarf emission in an old stellar population. Finally, we propose that NGC3115 was formed either through a two-phase formation scenario, or via an outside-in quenching of an isolated spiral galaxy, whose thick disc had been heated-up via minor mergers with dwarf satellites.

Keywords

galaxies: evolutiongalaxies: formationgalaxies: elliptical and lenticular
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 421 - 423
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

References

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