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arXiv · 2610.38836

Environmental Quenching of Satellite Galaxies out to z~0.4 with GAMA and DEVILS

Megan Oxland·Matías Bravo·Laura Parker·Luke Davies·Sabine Bellstedt
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Abstract

While numerous studies have shown that satellite galaxies experience declining star formation rates after infall, direct comparisons across different surveys and redshifts are complicated by varying sample selections, environmental metrics, and techniques used to derive galaxy properties. In this work, we select satellite galaxies from the highly complete Galaxy and Mass Assembly (GAMA) Survey and the Deep Extragalactic VIsible Legacy Survey (DEVILS) to investigate environmental quenching out to z~0.4. These surveys derive galaxy properties and environments in a consistent manner, minimizing systematic biases and enabling a robust comparison across redshift. Using projected phase space as a proxy for infall time, we quantify the evolution of the quenched fraction and trace how satellites evolve relative to the star-forming main sequence (SFMS). We find consistent trends between GAMA and DEVILS, with satellites exhibiting a steady decline in star formation relative to the SFMS at a rate of ~0.14 dex/Gyr following infall. Extending this analysis to include visual morphology, we find similar declining trends for both early- and late-type systems. Overall, we find no significant redshift evolution between GAMA and DEVILS, indicating that group and cluster environments have a comparable impact on the star formation activity of satellite galaxies over the past ~4.5 Gyr.

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Megan Oxland, Matías Bravo, Laura Parker, Luke Davies, Sabine Bellstedt. 2026-10-28. Environmental Quenching of Satellite Galaxies out to z~0.4 with GAMA and DEVILS. https://arxiv.org/abs/2610.38836

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