Anisotropic quenching is detected at the highest redshift yet and linked to preprocessing dominating over intrahalo effects by ~20% along the major axis in a delay-then-rapid quenching model informed by cluster accretion histories.
Protoclusters associated with z > 2 radio galaxies. I. Characteristics of high redshift protoclusters
9 Pith papers cite this work. Polarity classification is still indexing.
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Pith papers citing it
abstract
[Abridged] We present the results of a large program conducted with the Very Large Telescope and Keck telescope to search for forming clusters of galaxies near powerful radio galaxies at 2.0 < z < 5.2. We obtained narrow- and broad-band images of nine radio galaxies and their surroundings. The imaging was used to select candidate Lyman alpha emitting galaxies in ~3x3 Mpc^2 areas near the radio galaxies. A total of 337 candidate emitters were found with a rest-frame Lyman alpha equivalent width of EW_0 > 15 A and Sigma = EW_0/Delta EW_0 > 3. Follow-up spectroscopy confirmed 168 Lyman alpha emitters near eight radio galaxies. The success rate of our selection procedure is 91%. At least six of our eight fields are overdense in Lyman alpha emitters by a factor 3-5. Also, the emitters show significant clustering in velocity space. In the overdense fields, the width of the velocity distributions of the emitters is a factor 2-5 smaller than the width of the narrow-band filters. Taken together, we conclude that we have discovered six forming clusters of galaxies (protoclusters). We estimate that roughly 75% of powerful (L_2.7GHz > 10^33 erg/s/Hz/sr) high redshift radio galaxies reside in a protocluster, with a sizes of at least 1.75 Mpc. We estimate that the protoclusters have masses in the range 2-9 x 10^14 Msun and they are likely to be progenitors of present-day (massive) clusters of galaxies. For the first time, we have been able to estimate the velocity dispersion of cluster progenitors from z~5 to ~2. The velocity dispersion of the emitters increases with cosmic time, in agreement with the dark matter velocity dispersion in numerical simulations of forming massive clusters.
years
2026 9representative citing papers
Three z~3 protoclusters selected identically from the same imaging show diverse galaxy properties, likely reflecting different developmental phases of cluster formation.
Spectroscopic follow-up confirms four protoclusters at z~3.4 selected by the deep learning model PCFNet, with marginal diversity in gas-phase metallicity among them.
Three z>6 quasars from the JWST Aether survey have FeII emission strengths in the top ~3% of the low-redshift quasar population, indicating very rapid chemical enrichment within the first Gyr.
At z≈2, Magneticum protoclusters show moderate self-similarity deviations, double-β density profiles, and hot ionised gas dominant only beyond ~0.1–0.5 R500c, with clear mass, merger and AGN trends.
Simulations show observationally selected protocluster candidates at z ≳ 5 include significant interlopers, undergo 2-6 major mergers, and exhibit stronger clustering than observed, requiring total galaxy mass within 10 cMpc for reliable progenitor identification.
Using JWST spectroscopy and halo mass estimates, the authors show that massive quiescent galaxies at z~2 in more massive dark matter haloes formed earlier and possibly quenched earlier, though quenching times vary widely.
A review/roadmap arguing that SKA observations of radio galaxies, combined with multi-wavelength redshift and cosmic-web catalogues, will let radio galaxies trace and probe the structure, magnetism, and energetics of the cosmic web from z≈0 to z>4.
citing papers explorer
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Anisotropic quenching beyond $z=1$ and its implications for preprocessing around high-redshift galaxy clusters
Anisotropic quenching is detected at the highest redshift yet and linked to preprocessing dominating over intrahalo effects by ~20% along the major axis in a delay-then-rapid quenching model informed by cluster accretion histories.
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Diverse Protoclusters at $z\sim3$ Disclosed by Systematic Spectroscopy
Three z~3 protoclusters selected identically from the same imaging show diverse galaxy properties, likely reflecting different developmental phases of cluster formation.
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Diverse Metallicities in Protoclusters at $z \sim 3.4$ detected by Deep Learning
Spectroscopic follow-up confirms four protoclusters at z~3.4 selected by the deep learning model PCFNet, with marginal diversity in gas-phase metallicity among them.
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Extreme Enrichment at Cosmic Dawn: Three FeII-Strong Quasars at z > 6 from the JWST Aether survey
Three z>6 quasars from the JWST Aether survey have FeII emission strengths in the top ~3% of the low-redshift quasar population, indicating very rapid chemical enrichment within the first Gyr.
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The youth of the intracluster medium. I. A non-parametric characterisation of the gas and electron number density profiles of $z \simeq 2$ protoclusters
At z≈2, Magneticum protoclusters show moderate self-similarity deviations, double-β density profiles, and hot ionised gas dominant only beyond ~0.1–0.5 R500c, with clear mass, merger and AGN trends.
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On the later evolution of observationally selected protocluster candidates at $z\,{\gtrsim}\,5$
Simulations show observationally selected protocluster candidates at z ≳ 5 include significant interlopers, undergo 2-6 major mergers, and exhibit stronger clustering than observed, requiring total galaxy mass within 10 cMpc for reliable progenitor identification.
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The Role of Environment in Shaping the Assembly Timelines of Massive Quiescent Galaxies at Cosmic Noon
Using JWST spectroscopy and halo mass estimates, the authors show that massive quiescent galaxies at z~2 in more massive dark matter haloes formed earlier and possibly quenched earlier, though quenching times vary widely.
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Tracing the Cosmic web across Cosmic time through SKA observations of radio galaxies
A review/roadmap arguing that SKA observations of radio galaxies, combined with multi-wavelength redshift and cosmic-web catalogues, will let radio galaxies trace and probe the structure, magnetism, and energetics of the cosmic web from z≈0 to z>4.
- A large overdensity of LRD-like galaxies discovered by JWST in the SPT2349-56 protocluster at z=4.30