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Post-starburst galaxies in different environments

Published online by Cambridge University Press:  29 March 2021

Rodolfo Spindler Open the ORCID record for Rodolfo Spindler [Opens in a new window] ,
Marina Trevisan  and
Allan Schnorr-Müller Open the ORCID record for Allan Schnorr-Müller [Opens in a new window]
Rodolfo Spindler
Affiliation:
Department of Astronomy, Institute of Physics, Federal University of Rio Grande do Sul, 9500 Bento Gonçalves Avenue, Porto Alegre, RS, 91501-970, Brazil email: [email protected]
Marina Trevisan
Affiliation:
Department of Astronomy, Institute of Physics, Federal University of Rio Grande do Sul, 9500 Bento Gonçalves Avenue, Porto Alegre, RS, 91501-970, Brazil email: [email protected]
Allan Schnorr-Müller
Affiliation:
Department of Astronomy, Institute of Physics, Federal University of Rio Grande do Sul, 9500 Bento Gonçalves Avenue, Porto Alegre, RS, 91501-970, Brazil email: [email protected]
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Abstract

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Post-starburst galaxies (PSBGs) are systems that experienced a burst followed by a rapid quenching of star formation. However, it is still unclear what causes these events and what is the environmental role in the origin of PSBGs. To address this, we analysed sizes, morphologies, ages, and metallicities of PSBGs at 0.05 ≤ z ≤ 0.1 in groups and clusters of galaxies. We find a statistically significant excess of compact PSBGs in groups compared to a control sample of passive galaxies. Satellite PSBGs in groups tend to be more compact compared to their counterparts in clusters. Additionally, the PSBGs in groups have smaller T-type values and are likely to be found in inner group regions compared to PSBGs in clusters. Our results are compatible with dissipative wet merger events being an important mechanism responsible for the origin of PSBGs in groups, but other – less dissipative – processes may be producing PSBGs in cluster environments.

Keywords

galaxies: post-starburstgalaxies: quenchinggalaxies: environment
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 190 - 191
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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