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Variable metallicity yields as tracers of inflows

Published online by Cambridge University Press:  09 June 2023

Artemi Camps-Fariña Open the ORCID record for Artemi Camps-Fariña [Opens in a new window] ,
Patricia Sánchez-Blázquez ,
Santi Roca-Fàbrega  and
Sebastián F. Sánchez Open the ORCID record for Sebastián F. Sánchez [Opens in a new window]
Artemi Camps-Fariña
Affiliation:
Departamento de Física de la Tierra y Astrofísica, Universidad Complutense de Madrid, Pl. Ciencias, 1, Madrid, 28015, Spain; email: arcamps@ucm.es
Patricia Sánchez-Blázquez
Affiliation:
Departamento de Física de la Tierra y Astrofísica, Universidad Complutense de Madrid, Pl. Ciencias, 1, Madrid, 28015, Spain; email: arcamps@ucm.es
Santi Roca-Fàbrega
Affiliation:
Departamento de Física de la Tierra y Astrofísica, Universidad Complutense de Madrid, Pl. Ciencias, 1, Madrid, 28015, Spain; email: arcamps@ucm.es
Sebastián F. Sánchez
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México, Circuito Exterior, Ciudad de México, 04510, México
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Abstract

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Pristine gas accretion is expected to be the main driver of sustained star formation in galaxies. We measure the required amount of accreted gas at each moment over a galaxy’s history to produce the observed metallicity at that time given its star-forming history. More massive galaxies tend to have higher accretion rates and a larger drop of the accretion rate towards the present time. Within the same mass bin galaxies that are currently star-forming or in the Green Valley have similar, sustained, accretion histories while retired galaxies had a steep decline in the past. Plotting the T80 of the individual accretion histories, a measure of how sustained they are, versus the stellar mass and current sSFR we see a distribution such that currently star-forming galaxies have sustained or recent accretion and retired galaxies have declined accretion histories.

Keywords

galaxies: abundancesgalaxies: evolutiontechniques: spectroscopic
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. 246 - 248
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Creative Commons
Creative Common License - CCCreative Common License - BY
This is an Open Access article, distributed under the terms of the Creative Commons Attribution licence (https://creativecommons.org/licenses/by/4.0/), which permits unrestricted re-use, distribution, and reproduction in any medium, provided the original work is properly cited.
Copyright
© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union

References

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