Extended Radio AGN at z ∼ 1 in the ORELSE Survey: The Confining Effect of Dense Environments

Lu Shen*, Guilin Liu, Meng-Fei Zhang, Brian C. Lemaux, Lori M. Lubin, Debora Pelliccia, Emily Moravec, Emmet Golden-Marx, Hongyan Zhou, Wenjuan Fang, Adam Tomczak, John McKean, Neal A. Miller, Christopher D. Fassnacht, Po-Feng Wu, Dale Kocevski, Roy Gal, Denise Hung, Gordon Squires

*Corresponding author for this work

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Recent hydrodynamic simulations and observations of radio jets have shown that the surrounding environment has a large effect on their resulting morphology. To investigate this, we use a sample of 50 Extended Radio Active Galactic Nuclei (ERAGN) detected in the Observations of Redshift Evolution in Large-Scale Environments survey. These sources are all successfully cross-identified to galaxies within a redshift range of 0.55 ≤ z ≤ 1.35, either through spectroscopic redshifts or accurate photometric redshifts. We find that ERAGN are more compact in high-density environments than those in low-density environments at a significance level of 4.5σ. Among a series of internal properties under our scrutiny, only the radio power demonstrates a positive correlation with their spatial extent. After removing the possible radio power effect, the difference of size in low- and high-density environments persists. In the global environment analyses, the majority (86%) of high-density ERAGN reside in the cluster/group environment. In addition, ERAGN in the cluster/group central regions are preferentially compact with a small scatter in size, compared to those in the cluster/group intermediate regions and fields. In conclusion, our data appear to support the interpretation that the dense intracluster gas in the central regions of galaxy clusters plays a major role in confining the spatial extent of radio jets.
Original languageEnglish
Article number101
Number of pages13
JournalThe Astrophysical Journal
Issue number2
Publication statusPublished - 16-Oct-2020


  • Radio active galactic nuclei
  • Radio galaxies
  • Galaxy clusters
  • Radio jets
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  • 1343
  • 584
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