Revisiting scaling relations for giant radio halos in galaxy clusters

G. Brunetti; G.W. Pratt; K. Dolag; M. Markevitch; R. Cassano; R. Kale; S. Ettori; S. Giacintucci; T. Venturi

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Revisiting scaling relations for giant radio halos in galaxy clusters

R. Cassano, S. Ettori, G. Brunetti, S. Giacintucci, G.W. Pratt, T. Venturi, R. Kale, K. Dolag

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M. Markevitch

Cosmology and Nongalactic Astrophysics · Submitted 18 Jun 2013

abstract compiled · 2026-09-23 · no language-model review

The authors' main claim These results confirm the key role of mergers for the origin of giant radio halos, suggesting that they trigger the relativistic particle acceleration.

how it is stated · hedged possibility 0.79 read the record →

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arXiv ID1306.4379 (version 2)

Pith IDPQUX32NI, Pith's permanent record of this paper and its review

CitationG. Brunetti, G.W. Pratt, K. Dolag, M. Markevitch, R. Cassano, R. Kale, S. Ettori, S. Giacintucci, T. Venturi. "Revisiting scaling relations for giant radio halos in galaxy clusters." arXiv:1306.4379 (2013). https://pith.science/paper/PQUX32NI

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Many galaxy clusters host Megaparsec-scale radio halos, generated by ultrarelativistic electrons in the magnetized intracluster medium. Correlations between the power of radio halos and the thermal properties of the hosting clusters were established in the last decade, including the connection between the presence of a halo and cluster mergers. The X-ray luminosity and redshift limited Extended GMRT Radio Halo Survey provides a rich and unique dataset for statistical studies of the halos. We uniformly analyze the radio and X-ray data for the GMRT cluster sample, and use the new Planck SZ catalog, to revisit the correlations between the power of halos and the thermal properties of galaxy clusters. We find that the radio power of halos at 1.4 GHz scales with the cluster X-ray (0.1--2.4 keV) luminosity computed within R_500 as P_1.4 L_500^2.0. Our bigger and more homogenous sample confirms that the X-ray luminous (L_500 > 5x10^44 erg/s) clusters branch into two populations --- radio halos lie on the correlation, while clusters with upper limits to radio-halo emission are well below that correlation. This bimodality remains if we excise cool cores from the X-ray luminosities. Correlating with Planck data, we find that P_1.4 scales with the cluster integrated SZ signal within R_500 as P_1.4 Y_500^2.1, in line with previous findings. However, contrary to previous studies that were limited by incompleteness and small sample size, we find that the "SZ-luminous" Y_500 > 6x10^-5 Mpc^2 clusters show a bimodal behavior similar to that in the radio-X-ray diagram. Bimodality of both correlations can be traced to clusters dynamics, with radio halos found exclusively in merging clusters. These results confirm the key role of mergers for the origin of giant radio halos, suggesting that they trigger the relativistic particle acceleration.

background contribution method result interpretation main claim

What the classifier reports for each sentence. The number is the probability it gave the label.
#	sentence	role	the authors' own work	states the main conclusion	strength
s0	Many galaxy clusters host Megaparsec-scale radio halos, generated by ultrarelativistic electrons in the magnetized intracluster medium.	background 1.00	0.04	0.02	asserted 1.00
s1	Correlations between the power of radio halos and the thermal properties of the hosting clusters were established in the last decade, including the connection between the presence of a halo and cluster mergers.	background 1.00	0.04	0.03	asserted 1.00
s2	The X-ray luminosity and redshift limited Extended GMRT Radio Halo Survey provides a rich and unique dataset for statistical studies of the halos.	method 0.70	0.24	0.02	asserted 1.00
s3	We uniformly analyze the radio and X-ray data for the GMRT cluster sample, and use the new Planck SZ catalog, to revisit the correlations between the power of halos and the thermal properties of galaxy clusters.	method 0.71	0.94	0.03	asserted 0.87
s4	We find that the radio power of halos at 1.4 GHz scales with the cluster X-ray (0.1--2.4 keV) luminosity computed within R_500 as P_1.4 L_500^2.0.	result 1.00	0.97	0.21	asserted 1.00
s5	Our bigger and more homogenous sample confirms that the X-ray luminous (L_500 > 5x10^44 erg/s) clusters branch into two populations --- radio halos lie on the correlation, while clusters with upper limits to radio-halo emission are well below that correlation.	result 1.00	0.95	0.16	asserted 1.00
s6	This bimodality remains if we excise cool cores from the X-ray luminosities.	result 1.00	0.91	0.05	asserted 1.00
s7	Correlating with Planck data, we find that P_1.4 scales with the cluster integrated SZ signal within R_500 as P_1.4 Y_500^2.1, in line with previous findings.	result 1.00	0.94	0.07	asserted 1.00
s8	However, contrary to previous studies that were limited by incompleteness and small sample size, we find that the "SZ-luminous" Y_500 > 6x10^-5 Mpc^2 clusters show a bimodal behavior similar to that in the radio-X-ray diagram.	result 1.00	0.96	0.12	asserted 1.00
s9	Bimodality of both correlations can be traced to clusters dynamics, with radio halos found exclusively in merging clusters.	interpretation 0.80	0.85	0.52	asserted 0.98
s10	These results confirm the key role of mergers for the origin of giant radio halos, suggesting that they trigger the relativistic particle acceleration.	interpretation 1.00	0.67	0.79	hedged possibility 0.79

What kind of paper the classifier reports this is: empirical study 1.00 · evidence from analysis of existing data 0.99.

What was examined, and what was not

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arXiv listing abstract v2

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full text
figures and tables
references and citing sentences
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P abstract

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T body sentences
C citations
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Every quoted sentence on this record is the authors'. Every label is from Pith's closed vocabulary, with the probability shown beside it. Every number in the measurements table is the authors', checked by code. Record as JSON

The paper

Original abstract

Many galaxy clusters host Megaparsec-scale radio halos, generated by ultrarelativistic electrons in the magnetized intracluster medium. Correlations between the power of radio halos and the thermal properties of the hosting clusters were established in the last decade, including the connection between the presence of a halo and cluster mergers. The X-ray luminosity and redshift limited Extended GMRT Radio Halo Survey provides a rich and unique dataset for statistical studies of the halos. We uniformly analyze the radio and X-ray data for the GMRT cluster sample, and use the new Planck SZ catalog, to revisit the correlations between the power of halos and the thermal properties of galaxy clusters. We find that the radio power of halos at 1.4 GHz scales with the cluster X-ray (0.1--2.4 keV) luminosity computed within R_500 as P_1.4 L_500^2.0. Our bigger and more homogenous sample confirms that the X-ray luminous (L_500 > 5x10^44 erg/s) clusters branch into two populations --- radio halos lie on the correlation, while clusters with upper limits to radio-halo emission are well below that correlation. This bimodality remains if we excise cool cores from the X-ray luminosities. Correlating with Planck data, we find that P_1.4 scales with the cluster integrated SZ signal within R_500 as P_1.4 Y_500^2.1, in line with previous findings. However, contrary to previous studies that were limited by incompleteness and small sample size, we find that the "SZ-luminous" Y_500 > 6x10^-5 Mpc^2 clusters show a bimodal behavior similar to that in the radio-X-ray diagram. Bimodality of both correlations can be traced to clusters dynamics, with radio halos found exclusively in merging clusters. These results confirm the key role of mergers for the origin of giant radio halos, suggesting that they trigger the relativistic particle acceleration.

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References

Forward citations

Cited by 8 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

MeerKAT reveals an ultra-steep spectrum radio halo in Abell 370
astro-ph.GA 2026-11 accept novelty 7.0 of 10

Deep MeerKAT observations reveal that the radio halo in Abell 370 has a steeper spectrum (α=-1.54) and larger size (1.1 Mpc) than previously known, classifying it as an Ultra-Steep Spectrum Radio Halo (USSRH).
The MIni-Halos in MIni-Clusters (MIMIC) project: New insights into the origin of mini-halos from a LOFAR, uGMRT, and MeerKAT study of diffuse radio emission in Abell 496 and ZwCl 235
astro-ph.GA 2026-10 accept novelty 7.0 of 10

Two newly detected radio mini-halos in low-mass relaxed clusters have steep spectra and are confined by cold fronts, supporting turbulent re-acceleration and extending scaling relations to lower powers.
Two-component large-scale radio emission in Abell 2244
astro-ph.CO 2026-07 conditional novelty 6.0 of 10

Abell 2244 hosts a two-component radio halo whose outer part has a flatter spectral index than megahaloes and a weaker radio-X-ray correlation than the inner halo.
Multi-Wavelength Signatures of a Giant Cometary Radio Halo in MACSJ0417-1154
astro-ph.HE 2026-07 conditional novelty 6.0 of 10

MACSJ0417’s giant radio halo shows spectral steepening and radio–X-ray correlation consistent with turbulence from a 6:1 off-axis merger that preserved the cool core; pure hadronic models are energetically excluded.
MOSS III: MeerKATs view on the galaxy populations in two massive galaxy clusters
astro-ph.GA 2026-10 accept novelty 5.0 of 10

The actively merging cluster ZwCL2341 contains ~4× more star-forming galaxies and is dominated by star-formation-powered radio emission, while the relaxed cluster A2631 is an outlier in total SFR versus mass, suggesti...

Show 3 more citing papers

Unlocking Pandora's Secrets: Probing the Thermodynamics of Abell 2744
astro-ph.HE 2026-11 accept novelty 4.0 of 10

NuSTAR observations of Abell 2744 yield a shock Mach number of 1.58, rule out significant inverse Compton hard X-ray emission, and give a lower limit on the magnetic field of B > 0.2 μG.
The nature of the Diffuse Gamma-Ray Background
astro-ph.CO 2015-02 accept novelty 3.0 of 10

The review concludes that known astrophysical populations can plausibly account for most of the Fermi LAT diffuse gamma-ray background, leaving limited but not excluded room for a dark matter contribution.
Probing the Fundamental Nature of Particle Dark Matter
astro-ph.CO 2026-06 unverdicted novelty 2.0 of 10

Review summarizing radio searches for WIMP and ALP dark matter with SKA precursors and forecasts for SKA-Low and SKA-Mid telescopes.

How later papers used it

55 later papers cite it

Evidence: substantial. 32 of the citing papers share no author with it, and 13 of those carry a confident label from Pith's citation classifier.

Pith read 28 of the 120 citing sentences, choosing only those whose citation markers point at this paper alone, and wrote the paraphrases from them. The summary, the counts, the evidence level, the links and the quotes come from code; the summary counts the papers listed below. A later paper is listed under a label when Pith's citation classifier gives one of its sentences that label at probability 0.8 or more (0.95 for support), Pith's reading finds that the citing paper itself did it, and a second check confirms the paraphrase against the sentence. This section lists uses only. It does not list criticism or disagreement, so their absence here says nothing about how the paper has been received. Papers that share an author with this one are listed apart, under "By the same authors". A quote is the citing authors' own sentence, shown when their paper's licence is CC BY, CC BY-SA or CC0. JSON

3 later papers by other authors are listed below: 1 used its method or tool, 2 used its data or values and 1 compared its own results with it. 1 of them appears under more than one label. 3 more papers by the same authors are listed: 1 used its method or tool and 2 compared their own results with it.

Uses its method or tool 2 of 9 papers with this label · 1 by the same authors

Used an equation from this paper to estimate the error on the mini-halo flux.

On the relation between mini-halos and AGN feedback in clusters of galaxies (2020) · 0.99 · paraphrased: the licence does not allow quoting

By the same authors

Included the k-correction as in this paper to compute a specific luminosity at 143 MHz.

Discovery of large-scale diffuse radio emission in low-mass galaxy cluster Abell 1931 (2018) (same authors) · 0.96 · paraphrased: the licence does not allow quoting

Uses its data or values 2 of 4 papers with this label

Made use of observation data presented by this paper, which reported a scaling relation of P_1400 proportional to M_500^3.70 ± 0.56.

Contribution of Radio Halos to the Foreground for SKA EoR Experiments (2019) · 0.83 · paraphrased: the licence does not allow quoting
Determined the assumed halo surface brightness from observed scaling relations in this paper.

MERGHERS Pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev-Zel'dovich-selected galaxy clusters from ACT (2020) · 0.80 · paraphrased: the licence does not allow quoting

Compares with it 3 of 16 papers with this label · 2 by the same authors

Compared its own simulated scaling relation of P_1400 proportional to M_vir^3.94 ± 0.12 with this paper's findings, finding consistency on both slope and normalization.

Contribution of Radio Halos to the Foreground for SKA EoR Experiments (2019) · 0.99 · paraphrased: the licence does not allow quoting

By the same authors

Found that its equivalent BCES orthogonal fits from this paper and Shakouri et al. are consistent within the uncertainties, though the raw scatter increased with sample size.

Diffuse galaxy cluster emission at 168 MHz within the Murchison Widefield Array Epoch of Reionization 0-hour field (2017) (same authors) · 1.00 · paraphrased: the licence does not allow quoting
Compared its own 1 sigma rms upper limit for the radio halo with the value predicted from this paper's P_1.4 GHz-M_500 relation, finding it 6-12 times smaller.

Radio observations of the double-relic galaxy cluster Abell 1240 (2018) (same authors) · 0.96 · paraphrased: the licence does not allow quoting

How the literature uses it

6 arXiv papers cite this in 8 sentences

Each citing sentence is taken from the citing paper's LaTeX source and typed by Pith's classifier. A label appears at probability 0.8 or more (0.95 for support), a contest at 0.7 or more; the quoted words are the citing authors'. How each label was checked · JSON

Papers citing it · 6 sentences without a confident label

Uses its method or tool 1 paper

Following [ref] , we estimated the error on the minihalo flux density $S_MH$ as

New detections of radio minihalos in cool cores of galaxy clusters · Radio and X-ray data · 1.00

Cites it as background 1 paper

Additionally, an important class of diffuse, low surface brightness radio sources are cluster relics and halos (e.g. [ref] ), which are believed to be caused by shocks and turbulence in the outskirts of galaxy clusters [ref] .

Robust sparse image reconstruction of radio interferometric observations with purify · Discussion · 0.84

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