Fast magnetic field amplification in distant galaxy clusters

Gennaro, G. Di; Weeren, R. J. van; Brunetti, G.; Cassano, R.; Brüggen, M.; Hoeft, M.; Shimwell, T. W.; Röttgering, H. J. A.; Bonafede, A.; Botteon, A.; Cuciti, V.; Dallacasa, D.; Gasperin, F. de; Domínguez-Fernández, Paola; Enßlin, T. A.; Gastaldello, F.; Mandal, S.; Rossetti, M.; Simionescu, A.

doi:10.1038/s41550-020-01244-5

Cited by 50 publications

(53 citation statements)

References 66 publications

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“…The resulting flux densities are a bit higher, but consistent within the error bounds with the value of 14.4 ± 2.3 mJy reported by Di Gennaro et al (2020). This is to be expected, because our observations are deeper and Section 4 showed that we are likely Fig.…”

Section: Resultssupporting

confidence: 91%

“…We employ a uv-cut corresponding to 400 kpc at the cluster redshift (3447λ) for the compact source subtraction process. We confirm the detection of DiGennaro et al (2020) in our deeper image, which is shown in Figure3where we show the low-resolution compact source subtracted radio contours overlaid on the g, r, z optical image from the Legacy survey(Dey et al 2019). The high-resolution radio emission is shown the right panel of Figure 3.…”

supporting

confidence: 86%

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Diffuse radio emission from galaxy clusters in the LOFAR Two-metre Sky Survey Deep Fields

Osinga

Weeren

Boxelaar

et al. 2021

A&A

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Low-frequency radio observations are revealing an increasing number of diffuse synchrotron sources from galaxy clusters, primarily in the form of radio halos or radio relics. The existence of this diffuse synchrotron emission indicates the presence of relativistic particles and magnetic fields. It is still an open question as to exactly what mechanisms are responsible for the population of relativistic electrons driving this synchrotron emission. The LOFAR Two-metre Sky Survey Deep Fields offer a unique view of this problem. Reaching noise levels below 30 μJy beam−1, these are the deepest images made at the low frequency of 144 MHz. This paper presents a search for diffuse emission in galaxy clusters in the first data release of the LOFAR Deep Fields. We detect a new high-redshift radio halo with a flux density of 8.9 ± 1.0 mJy and corresponding luminosity of P144MHz = (3.6 ± 0.6) × 1025 W Hz−1 in an X-ray detected cluster at z = 0.77 with a mass estimate of M500 = 3.3−1.7+1.1 × 1014 M⊙. Deep upper limits are placed on clusters with non-detections. We compare the results to the correlation between halo luminosity and cluster mass derived for radio halos found in the literature. This study is one of a few to find diffuse emission in low mass (M500 < 5 × 1014 M⊙) systems and shows that deep low-frequency observations of galaxy clusters are fundamental for opening up a new part of parameter space in the study of non-thermal phenomena in galaxy clusters.

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Section: Resultssupporting

confidence: 91%

supporting

confidence: 86%

Diffuse radio emission from galaxy clusters in the LOFAR Two-metre Sky Survey Deep Fields

Osinga

Weeren

Boxelaar

et al. 2021

A&A

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“…There are many studies on the topic [54,[165][166][167][168][169][170][171], all of which give upper limits ranging from nG to a few µG. This is also confirmed by other methods, like the interpretation of radio observations as the result of shock acceleration in galaxy clusters [172,173]. In this context, fast radio bursts (FRBs) can play an important role [174], delivering both rotation and dispersion measures.…”

Section: General Constraintsmentioning

confidence: 82%

The Gamma-ray Window to Intergalactic Magnetism

Batista

Saveliev

2021

Universe

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One of the most promising ways to probe intergalactic magnetic fields (IGMFs) is through gamma rays produced in electromagnetic cascades initiated by high-energy gamma rays or cosmic rays in the intergalactic space. Because the charged component of the cascade is sensitive to magnetic fields, gamma-ray observations of distant objects such as blazars can be used to constrain IGMF properties. Ground-based and space-borne gamma-ray telescopes deliver spectral, temporal, and angular information of high-energy gamma-ray sources, which carries imprints of the intervening magnetic fields. This provides insights into the nature of the processes that led to the creation of the first magnetic fields and into the phenomena that impacted their evolution. Here we provide a detailed description of how gamma-ray observations can be used to probe cosmic magnetism. We review the current status of this topic and discuss the prospects for measuring IGMFs with the next generation of gamma-ray observatories.

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“…A study of a large statistical sample that covers these extended mass and redshift ranges has not been carried out. Most recently, LOFAR imaging of a declination-selected sample of nineteen z > 0.6, SZ-selected clusters revealed high-redshift diffuse emission with similar radio powers to those in lower redshift systems (Di Gennaro et al 2020). This is an indication that our theories of the evolution of cosmic magnetic fields, and therefore of the production of diffuse emission, require further study.…”

Section: Introductionmentioning

confidence: 91%

MERGHERS pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev–Zel’dovich-selected galaxy clusters from ACT

Knowles

Pillay

Amodeo

et al. 2021

Monthly Notices of the Royal Astronomical Society

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The MeerKAT Exploration of Relics, Giant Halos, and Extragalactic Radio Sources (MERGHERS) survey is a planned project to study a large statistical sample of galaxy clusters with the MeerKAT observatory. Here we present the results of a 16–hour pilot project, observed in response to the 2019 MeerKAT Shared Risk proposal call, to test the feasibility of using MeerKAT for a large cluster study using short (0.2–2.1 hour) integration times. The pilot focuses on 1.28 GHz observations of 13 massive, low-to-intermediate redshift (0.22 < z < 0.65) clusters from the Sunyaev-Zel’dovich-selected Atacama Cosmology Telescope (ACT) DR5 catalogue that show multiwavelength indications of dynamical disturbance. With a 70 per cent detection rate (9/13 clusters), this pilot study validates our proposed MERGHERS observing strategy and provides twelve detections of diffuse emission, eleven of them new, indicating the strength of MeerKAT for such types of studies. The detections (signal-to-noise ratio ≳ 6) are summarized as follows: two systems host both relic(s) and a giant radio halo, five systems host radio haloes, and two have candidate radio haloes. Power values, k-corrected to 1.4 GHz assuming a fiducial spectral index of α = −1.3 ± 0.4, are consistent with known radio halo and relic scaling relations.

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Fast magnetic field amplification in distant galaxy clusters

Cited by 50 publications

References 66 publications

Diffuse radio emission from galaxy clusters in the LOFAR Two-metre Sky Survey Deep Fields

Diffuse radio emission from galaxy clusters in the LOFAR Two-metre Sky Survey Deep Fields

The Gamma-ray Window to Intergalactic Magnetism

MERGHERS pilot: MeerKAT discovery of diffuse emission in nine massive Sunyaev–Zel’dovich-selected galaxy clusters from ACT

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