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February 5, 20260 citations

Exploring the IR-radio correlation in massive galaxy clusters at the end of cosmic noon

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NSN. SamansoJNJ. B. NantaisSAS. Alberts

Key Points

  • The research aims to investigate how the environment affects infrared and radio emissions of cluster galaxies during the epoch when quenching begins.
  • Analyzed 129 cluster member galaxies from 11 massive clusters at redshifts 1.0–1.8.
  • Calculated the IR-radio correlation slope parameter to identify differences in emissions.
  • Used comparisons between cluster galaxies and field galaxies across varying redshifts.
  • Identified and analyzed active galactic nuclei to assess their influence on the correlation.
  • Found a marginally significant difference in the IR-radio correlation slope between cluster and field galaxies.
  • Identified a stronger difference in correlation for lower-redshift clusters where quenching starts.
  • No observed difference in the high-redshift cluster samples compared to field galaxies.
  • AGNs did not significantly influence the IR-radio correlation, indicating they are mostly radio quiet.

Abstract

Context. Galaxies in overdense environments, such as clusters, present predominantly quenched populations up to z∼1. This suggests that environmental mechanisms suppress the star formation in these galaxies for the majority of cosmic history. At low redshifts, galaxies in rich group and cluster environments frequently show a radio emission excess in the IR-radio correlation, but this has yet to be confirmed at high redshifts, when environmental effects begin to strongly affect the evolution of cluster galaxies. Aims. We investigate the effect of the environment on the infrared and radio emission of cluster galaxies during the transition epoch at 11 Mpc). We find no difference in the IR-radio correlation between galaxies that host AGNs and non-active star-forming galaxies either. This suggests that our AGNs are overwhelmingly radio quiet and therefore do not affect the results we described above. We conclude that further investigations based on larger datasets are needed to constrain the impact of the cluster environment on the IR-radio correlation better.

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Cite This Study

Samanso et al. (2025) studied this question.

synapsesocial.com/papers/698433f6f1d9ada3c1fb19d7https://doi.org/10.1051/0004-6361/202452996/pdf
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Also Consider

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