Spatially resolved star-formation histories of local post-starburst galaxies: Starburst and quenching spatial patterns consistent with recent mergers
Ho-Hin Leung, Vivienne Wild, Michail Papathomas, Daniel J. Mortlock, Amy L. Rankine, Emma Curtis-Lake, Yirui Zheng, Adam C. Carnall, and Peter H. Johansson

TL;DR
This study uses spatially-resolved spectroscopy to analyze the star-formation histories of local post-starburst galaxies, revealing patterns consistent with recent mergers and providing insights into their quenching processes.
Contribution
It introduces a hierarchical Bayesian approach to measure detailed spatially-resolved SFHs, metallicity, and dust properties in PSB galaxies, linking observed patterns to merger-driven evolution.
Findings
Outer starbursts were weaker and slower, followed by stronger central starbursts.
Central starbursts caused a significant increase in stellar metallicity.
Features suggest tidal effects from recent mergers influence galaxy properties.
Abstract
Post-starburst (PSB) galaxies, having recently experienced a starburst followed by rapid quenching, are excellent laboratories to probe physical mechanisms that drive starbursts and shutting down of star formation. Integral-field spectroscopy reveals the galaxies' spatially-resolved properties, where observed directional patterns can be linked to the galaxies' past evolution. We measure the resolved star-formation histories (SFHs), stellar metallicity evolution and dust properties of three local PSBs from the MaNGA survey, down to " resolution (kpc) using a hierarchical Bayesian model. Local parameters were constrained simultaneously with parameters describing spatial trends. We found that all three galaxies first experienced an outer, weaker and slower quenching starburst, followed by a central, stronger and faster quenching starburst that peaked Gyr after the…
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Taxonomy
TopicsGalaxies: Formation, Evolution, Phenomena · Astronomy and Astrophysical Research · Gamma-ray bursts and supernovae
