Chemical pre-processing of cluster galaxies over the past 10 billion years in 
the IllustrisTNG simulations

Gupta, Anshu; Yuan, Tiantian; Torrey, Paul; Vogelsberger, Mark; Martizzi, Davide; Tran, Kim-Vy H.; Kewley, Lisa J.; Marinacci, Federico; Nelson, Dylan; Pillepich, Annalisa; Hernquist, Lars; Genel, Shy; Springel, Volker

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Chemical pre-processing of cluster galaxies over the past 10 billion years in the IllustrisTNG simulations

MPS-Authors

Gupta, Anshu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Yuan, Tiantian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Torrey, Paul
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Vogelsberger, Mark
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Martizzi, Davide
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tran, Kim-Vy H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kewley, Lisa J.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Marinacci, Federico
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nelson, Dylan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pillepich, Annalisa
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hernquist, Lars
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Genel, Shy
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Springel, Volker
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

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https://ui.adsabs.harvard.edu/abs/2018MNRAS.477L..35G
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Citation

Gupta, A., Yuan, T., Torrey, P., Vogelsberger, M., Martizzi, D., Tran, K.-V.-H., et al. (2018). Chemical pre-processing of cluster galaxies over the past 10 billion years in the IllustrisTNG simulations. Monthly Notices of the Royal Astronomical Society, 477, L35-L39.

Cite as: https://hdl.handle.net/21.11116/0000-0005-CD7A-C

Abstract

We use the IllustrisTNG simulations to investigate the evolution of the mass-metallicity relation (MZR) for star-forming cluster galaxies as a function of the formation history of their cluster host. The simulations predict an enhancement in the gas-phase metallicities of star-forming cluster galaxies (10⁹ < M_* < 10¹⁰ M_☉ h^-1) at z ≤ 1.0 in comparisons to field galaxies. This is qualitatively consistent with observations. We find that the metallicity enhancement of cluster galaxies appears prior to their infall into the central cluster potential, indicating for the first time a systematic `chemical pre-processing' signature for infalling cluster galaxies. Namely, galaxies that will fall into a cluster by z = 0 show a ̃0.05 dex enhancement in the MZR compared to field galaxies at z ≤ 0.5. Based on the inflow rate of gas into cluster galaxies and its metallicity, we identify that the accretion of pre- enriched gas is the key driver of the chemical evolution of such galaxies, particularly in the stellar mass range (10⁹ < M_* < 10¹⁰ M_☉ h^-1). We see signatures of an environmental dependence of the ambient/inflowing gas metallicity that extends well outside the nominal virial radius of clusters. Our results motivate future observations looking for pre- enrichment signatures in dense environments.