A 3D view of the Hydra I cluster core - II. Stellar populations
Carlos Eduardo Barbosa, Magda Arnaboldi, Michael Hilker, Lodovico, Coccato, Tom Richtler, Cl\'audia Mendes de Oliveira
TL;DR
This study uses new spectroscopic data to map stellar population properties in the Hydra I cluster core, revealing distinct age and metallicity distributions that inform galaxy cluster formation theories.
Contribution
It provides the first detailed spatial mapping of stellar populations in Hydra I's core using FORS2/VLT spectroscopy, linking stellar properties to cluster substructures.
Findings
Stellar populations follow photometric substructure trends.
Distinct properties suggest multiple formation epochs.
Results constrain cluster core evolutionary scenarios.
Abstract
Several observations of the central region of the Hydra I galaxy cluster point to a multi-epoch assembly history. Using our novel FORS2/VLT spectroscopic data set, we were able to map the luminosity-weighted age, [Fe/H] and [/Fe] distributions for the stellar populations around the cD galaxy NGC 3311. Our results indicate that the stellar populations follow the trends of the photometric substructures, with distinct properties that may aid to constrain the evolutionary scenarios for the formation of the cluster core.
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