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

Jones, A.; Gasperin, F. de; Cuciti, V.; Hoang, D. N.; Botteon, A.; Brüggen, M.; Brunetti, G.; Finner, Kyle; Forman, W.; Jones, C.; Kraft, Ralph; Shimwell, T. W.; Weeren, R. J. van

doi:10.1093/mnras/stab1443

Cited by 13 publications

(17 citation statements)

References 73 publications

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“…For radio halos, these systems include Abell 3562 (Venturi et al 2003;Giacintucci et al 2005 G049.32+44.37, PSZ2 G179.09+60.12, and PSZ2 G172.63+35.15 (Botteon et al 2022). For relics, the low-mass systems hosting relic(s) that have been reported in the literature are ZwCl 0008.8+5215 (Feretti et al 2012;van Weeren et al 2011), Abell 1240(Kempner & Sarazin 2001Bonafede et al 2009;Hoang et al 2018), Abell 3376 (Bagchi et al 2006), PSZ1 G096.89+24.17 (De Gasperin et al 2014;Jones et al 2021), Abell 168 (Dwarakanath et al 2018), Abell 1904(van Weeren et al 2021), PSZ2 G080.16+57.65, PSZ2 G099.48+55.60, PSZ2 G048.10+57.16, PSZ2 G165.46+66.15, and PSZ2 G057.61+34.93 (Botteon et al 2022).…”

Section: Source Classificationmentioning

confidence: 97%

Diffuse radio emission from non-Planckgalaxy clusters in the LoTSS-DR2 fields

Hoang

Brüggen

Botteon

et al. 2022

A&A

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Context. The presence of large-scale magnetic fields and ultra-relativistic electrons in the intra-cluster medium (ICM) is confirmed through the detection of diffuse radio synchrotron sources, so-called radio halos and relics. Due to their steep-spectrum nature, these sources are rarely detected at frequencies above a few gigahertz, especially in low-mass systems. Aims. The aim of this study is to discover and characterise diffuse radio sources in low-mass galaxy clusters in order to understand their origin and their scaling with host cluster properties. Methods. We searched for cluster-scale radio emission from low-mass galaxy clusters in the Low Frequency Array (LOFAR) Twometre Sky Survey -Data Release 2 (LoTSS-DR2) fields. We made use of existing optical (Abell, DESI, WHL) and X-ray (comPRASS, MCXC) catalogues. The LoTSS-DR2 data were processed further to improve the quality of the images that are used to detect and characterise diffuse sources. Results. We detect diffuse radio emission in 28 galaxy clusters. The numbers of confirmed (candidates) halos and relics are six (seven) and 10 (three), respectively. Among these, 11 halos and 10 relics, including candidates, are newly discovered by LOFAR. In addition to these, five diffuse sources are detected in tailed radio galaxies and are probably associated with mergers during the formation of the host clusters. We are unable to classify a further 13 diffuse sources. We compare our newly detected, diffuse sources to known sources by placing them on the scaling relation between the radio power and the mass of the host clusters.

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Section: Source Classificationmentioning

confidence: 97%

Diffuse radio emission from non-Planckgalaxy clusters in the LoTSS-DR2 fields

Hoang

Brüggen

Botteon

et al. 2022

A&A

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“…This relic is connected, at least in projection, to an AGN (see van Weeren et al 2021, for more details), which could have had an effect on the relic's brightness. Such an effect has been observed in other relics, such as PSZ2 G096.88+24.18 (Jones et al 2021). However, PSZ2 G089.52+62.34 is also a low-mass cluster, where we observe very few relics and therefore the correlation is poorly constrained.…”

Section: Low-power Rrsmentioning

confidence: 48%

“…Evidence of turbulence in the downstream regions of relics has been discovered in some clusters. For example, Kale et al (2012) and Jones et al (2021) found patchy polarised emission in the Abell 3376 and PSZ2 G096.88+24.18 relics, respectively, which they each attributed to turbulence. Di Gennaro et al (2021) performed an extensive analysis of the polarisation structure in the Sausage relic using RM-synthesis.…”

Section: Downstream Relic Widthmentioning

confidence: 99%

The Planck clusters in the LOFAR sky VI. LoTSS-DR2: Properties of radio relics

Jones,

de Gasperin,

Cuciti

et al. 2023

Preprint

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Context. It is well-established that shock waves in the intracluster medium launched by galaxy cluster mergers can produce synchrotron emission, which is visible to us at radio frequencies as radio relics. However, the particle acceleration mechanism producing these relics is still not fully understood. It is also unclear how relics relate to radio halos, which trace merger-induced turbulence in the intracluster medium. Aims. We aim to perform the first statistical analysis of radio relics in a mass-selected sample of galaxy clusters, using homogeneous observations. Methods. We analysed all relics observed by the Low Frequency Array Two Metre Sky Survey Data Release 2 (LoTSS DR2) at 144 MHz, hosted by galaxy clusters in the second Planck catalogue of SZ sources (PSZ2). We measured and compared the relic properties in a uniform, unbiased way. In particular, we developed a method to describe the characteristic downstream width in a statistical manner. Additionally, we searched for differences between radio relic-hosting clusters with and without radio halos. Results. We find that, in our sample, ∼ 10% of galaxy clusters host at least one radio relic. We confirm previous findings, at higher frequencies, of a correlation between the relic-cluster centre distance and the longest linear size, as well as the radio relic power and cluster mass. However, our findings suggest that we are still missing a population of low-power relics. We also find that relics are wider than theoretically expected, even with optimistic downstream conditions. Finally, we do not find evidence of a single property that separates relic-hosting clusters with and without radio halos.Conclusions.

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“…For PSZ1 G096.89+24.17, we used flux density measurements at 140 MHz and 1.5 GHz from Jones et al (2021) and we computed 380 and 610 MHz flux densities from proprietary GMRT observations (Rajpurohit et al in preparation). For El Gordo, we measured the flux density at 325 and 610 MHz using archival observations (observed during 2017), and we used the 2.1 GHz measurement from Lindner et al (2014).…”

Section: Appendix A: Broadband Integrated Radio Spectramentioning

confidence: 99%

Using the polarization properties of double radio relics to probe the turbulent compression scenario

Stuardi

Bonafede

Rajpurohit

et al. 2022

A&A

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Context. Radio relics are megaparsec-sized synchrotron sources located in the outskirts of some merging galaxy clusters. Binarymerging systems with a favorable orientation may host two almost symmetric relics, named double radio relics. Aims. Double radio relics are seen preferentially edge-on and, thus, constitute a privileged sample for statistical studies. Their polarization and Faraday rotation properties give direct access to the relics' origin and magnetic fields. Methods. In this paper, we present a polarization and rotation measure (RM) synthesis study of four clusters hosting double radio relics, namely 8C 0212+703, Abell 3365, and PLCK G287.0+32.9; previously missing polarization studies; and ZwCl 2341+0000, for which conflicting results have been reported. We used 1-2 GHz Karl G. Jansky Very Large Array observations. We also provide an updated compilation of known double radio relics with important observed quantities. We studied their polarization and Faraday rotation properties at 1.4 GHz and we searched for correlations between fractional polarization and physical resolution, the distance from the cluster center, and the shock Mach number. Results. The weak correlations found between these quantities are well reproduced by state-of-the-art magneto-hydrodynamical simulations of radio relics, confirming that merger shock waves propagate in a turbulent medium with tangled magnetic fields. Both external and internal Faraday depolarization should play a fundamental role in determining the polarization properties of radio relics at 1.4 GHz. Although the number of double radio relics with RM information is still low, their Faraday rotation properties (i.e., restframe RM and RM dispersion below 40 rad m −2 and non-Gaussian RM distribution) can be explained in the scenario in which shock waves with Mach numbers larger than 2.5 propagate along the plane of the sky and compress the turbulent intra-cluster medium.

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

Cited by 13 publications

References 73 publications

Diffuse radio emission from non-Planckgalaxy clusters in the LoTSS-DR2 fields

Diffuse radio emission from non-Planckgalaxy clusters in the LoTSS-DR2 fields

The Planck clusters in the LOFAR sky VI. LoTSS-DR2: Properties of radio relics

Using the polarization properties of double radio relics to probe the turbulent compression scenario

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