Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1–2 GHz

Rajpurohit, K.; Hoeft, M.; Weeren, R. J. van; Rudnick, Lawrence; Röttgering, H. J. A.; Forman, W.; Brüggen, M.; Croston, J. H.; Andrade-Santos, Felipe; Dawson, William A.; Intema, H. T.; Kraft, Ralph; Jones, Christine; Jee, M. James

doi:10.3847/1538-4357/aa9f13

Cited by 93 publications

(168 citation statements)

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“…1 panel (a). The overall morphology and extent of the halo at 550-750 MHz and 2-4 GHz are similar to that observed by van Weeren et al (2016) and Rajpurohit et al (2018) at 150 MHz and 1.5 GHz, respectively. However, we note that at each frequency, the transition from the relic to the halo occurs at somewhat different locations.…”

Section: Radio Halosupporting

confidence: 87%

“…Our new images manifest the variety of fine structures, as reported by Rajpurohit et al (2018), in the form of arcs, streams, and filaments of enhanced surface brightness. In Fig.…”

Section: The Toothbrush Relicsupporting

confidence: 73%

“…2. High resolution uGMRT image of the Toothbrush relic confirming the complex filamentary structures visible at 1-2 GHz (Rajpurohit et al 2018) also in the 550-750 MHz range. The beam size is indicated in the bottom left corner of the image.…”

Section: Vla Observationsmentioning

confidence: 66%

“…These images are created with different uv-tapers to emphasize the radio emission on various spatial scales. The sources are labeled following van and Rajpurohit et al (2018). An overview of the properties of the diffuse radio sources in the cluster is given in Table 3.…”

Section: Results: Continuum Imagesmentioning

confidence: 99%

“…7. It has been reported that the region S is possibly connected to the southern shock front, thus may have a different origin Rajpurohit et al (2018).…”

Section: Radio Halomentioning

confidence: 99%

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New mysteries and challenges from the Toothbrush relic: wideband observations from 550 MHz to 8 GHz

Rajpurohit

Hoeft

Vazza

et al. 2020

A&A

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130

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Context. Radio relics are diffuse extended synchrotron sources that originate from shock fronts induced by galaxy cluster mergers. The actual particle acceleration mechanism at the shock fronts is still under debate. The galaxy cluster 1RXS J0603.3+4214 hosts one of the most intriguing examples of radio relics, known as the Toothbrush. Aims. To understand the mechanism(s) that accelerate relativistic particles in the intracluster medium (ICM), we investigate the spectral properties of large scale diffuse extended sources in the merging galaxy cluster 1RXS J0603.3+4214. Methods. We present new wideband radio continuum observations made with uGMRT and VLA. Our new observations in combination with previously published data, allowed us to carry out a detailed high spatial resolution spectral and curvature analysis of the known diffuse radio emission sources, over a broad range of frequencies.Results. The integrated spectrum of the Toothbrush follows closely a power law over close to 2 decades in frequency, with a spectral index of −1.16 ± 0.02. We do not find any evidence of spectral steepening below 8 GHz. The subregions of the main Toothbrush also exhibit near-perfect power laws, implying a very regular combination of shock properties across the shock front. Recent numerical simulations show an intriguing similar spectral index, suggesting that the radio spectrum is dominated by the average over the inhomogeneities within the shock, with most of the emission coming from the tail of the Mach number distribution. In contrast to the Toothbrush, the spectrum of the fainter relics show a high frequency steepening. Moreover, also the integrated spectrum of the halo follows a power law from 150 MHz to 3 GHz with a spectral index of −1.16 ± 0.04. We do not find any evidence for spectral curvature, not even in subareas of the halo. This suggest a homogeneous acceleration throughout the cluster volume. Between the "brush" region of the Toothbrush and the halo, the color-color analysis revealed emission that was consistent with an overlap between the two different spectral regions. Conclusions. None of the relic structures, the Toothbrush as a whole or its subregions or the other two fainter relics, show spectral shapes consistent with a single injection of relativistic electrons, such as at a shock, followed by synchrotron aging in a relatively homogeneous environment. Inhomogeneities in some combination of Mach number, magnetic field strengths and projection effects dominate the observed spectral shapes.

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Section: Radio Halosupporting

confidence: 87%

“…Our new images manifest the variety of fine structures, as reported by Rajpurohit et al (2018), in the form of arcs, streams, and filaments of enhanced surface brightness. In Fig.…”

Section: The Toothbrush Relicsupporting

confidence: 73%

Section: Vla Observationsmentioning

confidence: 66%

Section: Results: Continuum Imagesmentioning

confidence: 99%

“…7. It has been reported that the region S is possibly connected to the southern shock front, thus may have a different origin Rajpurohit et al (2018).…”

Section: Radio Halomentioning

confidence: 99%

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New mysteries and challenges from the Toothbrush relic: wideband observations from 550 MHz to 8 GHz

Rajpurohit

Hoeft

Vazza

et al. 2020

A&A

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130

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Magnetic Field Amplification in Galaxy Clusters and Its Simulation

et al. 2018

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We review the present theoretical and numerical understanding of magnetic field amplification in cosmic large-scale structure, on length scales of galaxy clusters and beyond. Structure formation drives compression and turbulence, which amplify tiny magnetic seed fields to the microGauss values that are observed in the intracluster medium. This process is intimately connected to the properties of turbulence and the microphysics of the intracluster medium. Additional roles are played by merger induced shocks that sweep through the intra-cluster medium and motions induced by sloshing cool cores. The accurate simulation of magnetic field amplification in clusters still poses a serious challenge for simulations of cosmological structure formation. We review the current literature on cosmological simulations that include magnetic fields and outline theoretical as well as numerical challenges.

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Diffuse Radio Emission from Galaxy Clusters

et al. 2019

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In a growing number of galaxy clusters diffuse extended radio sources have been found. These sources are not directly associated with individual cluster galaxies. The radio emission reveal the presence of cosmic rays and magnetic fields in the intracluster medium (ICM). We classify diffuse cluster radio sources into radio halos, cluster radio shocks (relics), and revived AGN fossil plasma sources. Radio halo sources can be further divided into giant halos, mini-halos, and possible "intermediate" sources. Halos are generally positioned at cluster center and their brightness approximately follows the distribution of the thermal ICM. Cluster radio shocks (relics) are polarized sources mostly found in the cluster's periphery. They trace merger induced shock waves. Revived fossil plasma sources are characterized by their radio steep-spectra and often irregular morphologies. In this review we give an overview of the properties of diffuse cluster radio sources, with an emphasis on recent observational results. We discuss the resulting implications for the underlying physical acceleration processes that operate in the ICM, the role of relativistic fossil plasma, and the properties of ICM shocks and magnetic fields. We also compile an updated list of diffuse cluster radio sources which will be available on-line (http://galaxyclusters.com).

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Deep VLA Observations of the Cluster 1RXS J0603.3+4214 in the Frequency Range of 1–2 GHz

Cited by 93 publications

References 85 publications

New mysteries and challenges from the Toothbrush relic: wideband observations from 550 MHz to 8 GHz

New mysteries and challenges from the Toothbrush relic: wideband observations from 550 MHz to 8 GHz

Magnetic Field Amplification in Galaxy Clusters and Its Simulation

Diffuse Radio Emission from Galaxy Clusters

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