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Diving deeper into jellyfish: The rich population of jellyfish galaxies in Abell 901/2

Published online by Cambridge University Press:  29 March 2021

Fernanda Roman de Oliveira Open the ORCID record for Fernanda Roman de Oliveira [Opens in a new window] ,
Ana Chies Santos ,
Fabrício Ferrari  and
Geferson Lucatelli
Fernanda Roman de Oliveira
Affiliation:
Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, RS, Brazil email: fernanda.oliveira@ufrgs.br
Ana Chies Santos
Affiliation:
Departamento de Astronomia, Universidade Federal do Rio Grande do Sul, Av. Bento Gonçalves 9500, 91501-970, Porto Alegre, RS, Brazil email: fernanda.oliveira@ufrgs.br
Fabrício Ferrari
Affiliation:
Instituto de Matemática, Estatística e Física, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
Geferson Lucatelli
Affiliation:
Instituto de Matemática, Estatística e Física, Universidade Federal do Rio Grande, Rio Grande, RS, Brazil
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Abstract

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Jellyfish galaxies are the most striking examples of galaxies undergoing ram pressure stripping – the removal of gas as a result of a hydrodynamic friction in dense environments. As part of the OMEGA (OSIRIS Mapping of Emission-line Galaxies in Abell 901/2) survey, we have identified the largest sample of jellyfish galaxies in a single system to this date, located in the Abell 901/2 multi-cluster system at z ˜ 0.165. We present our results with a detailed description of this sample regarding their very high star formation rates and their unique spatial distribution pattern that can be explained as a result of the merging system triggering ram pressure stripping events. Furthermore, we also show the results of our most recent morphometric studies where we use Morfometryka as a tool to characterise the morphologies and structural evolution of jellyfish galaxies. Our morphometric analysis shows that jellyfish galaxy candidates have peculiar concave regions in their surface brightness profiles. Therefore, these profiles are less concentrated (lower Sérsic indices) than other star forming galaxies that are not experiencing such extreme ram pressure effects.

Keywords

galaxies: evolutiongalaxies: structuregalaxies: clusters: generalgalaxies: intergalactic medium
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 15 , Symposium S359: Galaxy Evolution and Feedback across Different Environments , March 2019 , pp. 147 - 152
Copyright
© The Author(s), 2021. Published by Cambridge University Press on behalf of International Astronomical Union

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