The impact of galaxy cluster growth on ram pressure stripping
Fecha
2024
Autores
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TDOC
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Universidad de Valparaíso
Ubicación
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item.page.issne
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Facultad
Facultad de Ciencias
Departamento o Escuela
Facultad de Ciencias. Instituto de Física y Astronomía
Determinador
Recolector
Especie
Nota general
Doctorado en Astrofísica. Universidad de Valparaíso. 2024.
Resumen
In a hierarchical Universe, galaxy clusters continue to grow with cosmic time, and thus, many of them are disturbed by the accretion of groups or major collisions with other clusters.
Hydrodynamical simulations and a few observational works show that ram-pressure stripping can be boosted up in merging clusters, providing an alternative way of forming jellyfish galaxies. In this work, we classify the dynamical state of the WINGS and OmegaWINGS X-ray selected cluster samples at z ∼ 0.05 using different proxies from the most diverse wavelengths to investigate how the fractions of ram-pressure stripped galaxies among the spiral population correlate with the cluster “messiness”. Our findings show no significant correlation between a cluster ’s dynamical state or mass and the fraction of jellyfish galaxies. We tentatively create a dynamical state classification system considering dynamic state classification parameters at different wavelengths. When analyzing the results, we found a possible enhancement in interacting clusters. The results regarding the cluster mass are intriguing since, in massive clusters, the higher relative velocity between the ICM and the galaxies in messy environments is also expected to enhance ram pressure. Ram pressure stripping beyond the analysed cluster radius or pre-processing in galaxy groups could impact this result.
Our results show that cluster mergers possibly accelerate galaxy evolution through ram pressure enhancement. The amount of recently accreted galaxy groups is not linked to this enhancement since, in substructures, we found a suppressed fraction of galaxies undergoing ram pressure stripping.
Descripción
Lugar de Publicación
Valparaíso
Auspiciador
Palabras clave
GALAXIAS, SUPERCUMULOS