Analytical model for cluster radio relics

Brüggen, M.; Vazza, Franco

doi:10.1093/mnras/staa418

Cited by 30 publications

(24 citation statements)

References 83 publications

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“…Radio relics are elongated (∼Mpc), steep-spectrum (α −1) synchrotron sources that sit preferentially at the edges of galaxy clusters (e.g., Enßlin et al 1998;van Weeren et al 2010van Weeren et al , 2019Brunetti & Jones 2014;Pearce et al 2017). There is a consensus that radio relics are produced by large shock waves but many aspects, including the cause for the apparently high particle acceleration efficiency, remain unclear (e.g., Botteon et al 2016bBotteon et al , 2020bvan Weeren et al 2016b;Hoang et al 2017Hoang et al , 2018Okabe et al 2019Okabe et al , 2021Brüggen & Vazza 2020). Another type of extended synchrotron radio source, namely halos, is often found in the central region of galaxy clusters.…”

Section: Radio Emission From the Merging Clusters Efeds J0935133+004mentioning

confidence: 99%

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

Ghirardini

Bulbul

Hoang

et al. 2021

A&A

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Aims. We examine the X-ray, optical, and radio properties of the member clusters of a new supercluster discovered during the SRG/eROSITA Performance Verification phase. Methods. We analyzed the 140 deg2 eROSITA Final Equatorial Depth Survey (eFEDS) field observed during the Performance Verification phase to a nominal depth of about 2.3 ks. In this field, we detect a previously unknown supercluster consisting of a chain of eight galaxy clusters at z ~ 0.36. The redshifts of these members were determined through Hyper Suprime-Cam photometric measurements. We examined the X-ray morphological and dynamical properties, gas, and total mass out to R500 of the members and compare these with the same properties of the general population of clusters detected in the eFEDS field. We further investigated the gas in the bridge region between the cluster members for a potential WHIM detection. We also used radio follow-up observations with LOFAR and uGMRT to search for diffuse emission and constrain the dynamic state of the system. Results. We do not find significant differences between the morphological parameters and properties of the intra-cluster medium of the clusters embedded in this large-scale filament and those of the eFEDS clusters. We also provide upper limits on the electron number density and mass of the warm-hot intergalactic medium as provided by the eROSITA data. These limits are consistent with previously reported values for the detections in the vicinity of clusters of galaxies. In LOFAR and uGMRT follow-up observations of the northern part of this supercluster, we find two new radio relics and a radio halo that are the result of major merger activity in the system. Conclusions. These early results show the potential of eROSITA to probe large-scale structures such as superclusters and the properties of their members. Our forecasts show that we will be able to detect about 450 superclusters, with approximately 3000 member clusters located in the eROSITA_DE region at the final eROSITA all-sky survey depth, enabling statistical studies of the properties of superclusters and their constituents embedded in the cosmic web.

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Section: Radio Emission From the Merging Clusters Efeds J0935133+004mentioning

confidence: 99%

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

Ghirardini

Bulbul

Hoang

et al. 2021

A&A

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“…Schuecker et al 2001;Cassano 2010). Cluster radio shocks or radio relics are arc-shaped, diffuse sources that appear to be related to shock waves in the ICM (Brüggen & Vazza 2020). Moreover, there is a class of sources that trace old radio plasma from AGN that has been re-energised through processes in the ICM.…”

Section: Introductionmentioning

confidence: 99%

Radio observations of the merging galaxy cluster system Abell 3391-Abell 3395

Brüggen

Reiprich

Bulbul

et al. 2021

A&A

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The pre-merging system of galaxy clusters Abell 3391-Abell 3395 located at a mean redshift of 0.053 has been observed at 1 GHz in an ASKAP/EMU Early Science observation as well as in X-rays with eROSITA. The projected separation of the X-ray peaks of the two clusters is ∼50 or ∼ 3.1 Mpc. Here we present an inventory of interesting radio sources in this field around this cluster merger. While the eROSITA observations provide clear indications of a bridge of thermal gas between the clusters, neither ASKAP nor MWA observations show any diffuse radio emission coinciding with the X-ray bridge. We derive an upper limit on the radio emissivity in the bridge region of J 1 GHz < 1.2 × 10 −44 W Hz −1 m −3. A non-detection of diffuse radio emission in the X-ray bridge between these two clusters has implications for particle-acceleration mechanisms in cosmological large-scale structure. We also report extended or otherwise noteworthy radio sources in the 30 deg 2 field around Abell 3391-Abell 3395. We identified 20 Giant Radio Galaxies, plus 7 candidates, with linear projected sizes greater than 1 Mpc. The sky density of field radio galaxies with largest linear sizes of > 0.7 Mpc is ≈ 1.7 deg −2 , three times higher than previously reported. We find no evidence for a cosmological evolution of the population of Giant Radio Galaxies. Moreover, we find seven candidates for cluster radio relics and radio halos.

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“…Diffusive Shock Acceleration (DSA, see Blandford & Eichler 1987, for a review) is the most likely mechanism driving the particle acceleration at shock fronts. It can explain many properties of relics, such as their morphologies, radio fluxes, polarisation properties and the power-law energy distribution of cosmic rays (Hoeft & Brüggen 2007;Kang et al 2012;Brüggen & Vazza 2020). Observations of some cluster relics suggest that they can be explained by diffusive shock acceleration of electrons from the thermal pool (standard DSA), as in e.g.…”

Section: Introductionmentioning

confidence: 99%

Radio relics in PSZ2 G096.88+24.18: a connection with pre-existing plasma

Jones

Gasperin

Cuciti

et al. 2021

Monthly Notices of the Royal Astronomical Society

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Giant radio relics are arc-like structures of diffuse, non-thermal synchrotron radiation that trace shock waves induced by galaxy cluster mergers. The particle (re-)acceleration mechanism producing such radio relics is unclear. One major open question is whether relics can be formed directly from a population of thermal seed electrons, or if pre-existing relativistic seed electrons are required. In some cases AGN can provide such a population of sub-GeV electrons. However, it is unclear how common this connection is. In this paper we present LOFAR 140 MHz and VLA L-band radio observations, as well as Chandra data of PSZ2 G096.88+24.18, a merging galaxy cluster system hosting a pair of radio relics. A large patch of diffuse emission connects a bright radio galaxy with one of the relics, likely affecting the properties of the relic. We find that the most plausible explanation for the connection is that the merger shock wave has passed over an AGN lobe. The shock passing over this seed population of electrons has led to an increased brightness in the relic only in the region filled with seed electrons.

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Analytical model for cluster radio relics

Cited by 30 publications

References 83 publications

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

Radio observations of the merging galaxy cluster system Abell 3391-Abell 3395

Radio relics in PSZ2 G096.88+24.18: a connection with pre-existing plasma

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