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Recovering the star formation history of galaxies through spectral fitting: Current challenges

Published online by Cambridge University Press:  29 March 2021

Lucimara P. Martins Open the ORCID record for Lucimara P. Martins [Opens in a new window]
Lucimara P. Martins*
Affiliation:
Núcleo de Astrofísica/Universidade Cidade de São Paulo/Universidade Cruzeiro do Sul Rua Galvão Bueno, 868, São Paulo, SP, Brazil, 01506-000 email: lucimara.martins@cruzeirodosul.edu.br
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Abstract

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With the exception of some nearby galaxies, we cannot resolve stars individually. To recover the galaxies star formation history (SFH), the challenge is to extract information from their integrated spectrum. A widely used tool is the full spectral fitting technique. This consists of combining simple stellar populations (SSPs) of different ages and metallicities to match the integrated spectrum. This technique works well for optical spectra, for metallicities near solar and chemical histories not much different from our Galaxy. For everything else there is room for improvement. With telescopes being able to explore further and further away, and beyond the optical, the improvement of this type of tool is crucial. SSPs use as ingredients isochrones, an initial mass function, and a library of stellar spectra. My focus are the stellar libraries, key ingredient for SSPs. Here I talk about the latest developments of stellar libraries, how they influence the SSPs and how to improve them.

Keywords

atomic datastars: fundamental parametersgalaxies: stellar content
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 386 - 390
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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