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Direct measures of chemical abundances from stacked spectra of star-forming galaxies: Implications for the mass–metallicity–star formation rate relation

Published online by Cambridge University Press:  29 March 2021

Slodkowski Katia Clerici Open the ORCID record for Slodkowski Katia Clerici [Opens in a new window]  and
Natalia Vale Asari Open the ORCID record for Natalia Vale Asari [Opens in a new window]
Slodkowski Katia Clerici
Affiliation:
Departamento de Física - CFM, Universidade Federal de Santa Catarina, C.P. 476, 88040-900, Florianópolis, SC, Brazil email: [email protected]
Natalia Vale Asari
Affiliation:
Departamento de Física - CFM, Universidade Federal de Santa Catarina, C.P. 476, 88040-900, Florianópolis, SC, Brazil email: [email protected]
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Abstract

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The stellar mass–star formation rate–metallicity relation provides clues on the chemical evolution of galaxies. We revisit this relation by measuring the gas-phase metallicity using the direct method. For metal-rich galaxies this is not straightforward, because auroral emission lines sensitive the electron temperature are lost in spectral noise. In order to increase the spectral signal-to-noise ratio and detect faint auroral lines, we stack the spectra of similar galaxies. This allows us to use the direct method to obtain consistent metallicity measurements.

Keywords

galaxies: abundancesgalaxies: ISMISM: HII regionsISM: abundances
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 424 - 426
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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