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The interplay of internal and external processes in the buildup of disk galaxies: thick-disk star formation histories in AURIGA simulations

Published online by Cambridge University Press:  09 June 2023

Francesca Pinna Open the ORCID record for Francesca Pinna [Opens in a new window] ,
Daniel Walo-Martín  and
Robert J.J. Grand
Francesca Pinna
Affiliation:
Max Planck Institute for Astronomy, Koenigstuhl 17, D-69117 Heidelberg, Germany email: pinna@mpia.de
Daniel Walo-Martín
Affiliation:
Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, Av. del Astrofísico Francisco Sánchez s/n, E-38206, La Laguna, Tenerife, Spain
Robert J.J. Grand
Affiliation:
Instituto de Astrofísica de Canarias, Calle Vía Láctea s/n, E-38205 La Laguna, Tenerife, Spain Departamento de Astrofísica, Universidad de La Laguna, Av. del Astrofísico Francisco Sánchez s/n, E-38206, La Laguna, Tenerife, Spain
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Abstract

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Recent integral-field spectroscopy observations have revealed that thick- and thin-disk star-formation histories are regulated by the interplay of internal and external processes. We analyze stellar-population properties of 24 spiral galaxies from the AURIGA zoom-in cosmological simulations, to offer a more in-depth interpretation of observable properties. We present edge-on maps of stellar age, metallicity and [Mg/Fe] abundance, and we extract the star-formation and chemical-evolution histories of thin and thick disks. Both show signs of the interplay between internal chemical enrichment and gas and star accretion. Thick disks show particularly complex stellar populations, including an in-situ component, formed from both slowly enriched and accreted more pristine gas, and an additional significant fraction of ex-situ stars.

Keywords

techniques: spectroscopicgalaxies: evolutiongalaxies: structure
Type
Contributed Paper
Information
Proceedings of the International Astronomical Union , Volume 17 , Symposium S373: Resolving the Rise and Fall of Star Formation in Galaxies , August 2021 , pp. 151 - 153
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Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

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