Magnetic Field Amplification in Galaxy Clusters and Its Simulation

Donnert, J.; Vazza, Franco; Brüggen, M.; ZuHone, John

doi:10.1007/s11214-018-0556-8

Cited by 133 publications

(133 citation statements)

References 302 publications

(346 reference statements)

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“…This finding provides important information for models of amplification of B in galaxy clusters, in particular on the origin of the seed field that is stirred and amplified by turbulence and small scale dynamo (Dolag et al 2005;Vazza et al 2018;Donnert et al 2018). Since the dynamo mechanism is a slow process that requires several turbulent eddy-turnover times (several Gyrs, e.g., Vazza et al 2018, and ref.…”

Section: Discussionmentioning

confidence: 86%

LOFAR Discovery of a Radio Halo in the High-redshift Galaxy Cluster PSZ2 G099.86+58.45

Cassano

Botteon

Gennaro

et al. 2019

ApJL

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In this Letter, we report the discovery of a radio halo in the high-redshift galaxy cluster PSZ2 G099.86+58.45 (z = 0.616) with the LOw Frequency ARray (LOFAR) at 120-168 MHz. This is one of the most distant radio halos discovered so far. The diffuse emission extends over ∼ 1 Mpc and has a morphology similar to that of the X-ray emission as revealed by XMM-Newton data. The halo is very faint at higher frequencies and is barely detected by follow-up 1-2 GHz Karl G. Jansky Very Large Array (JVLA) observations, which enable us to constrain the radio spectral index to be α < ∼ 1.5 − 1.6, i.e., with properties between canonical and ultra-steep spectrum radio halos. Radio halos are currently explained as synchrotron radiation from relativistic electrons that are re-accelerated in the intra-cluster medium (ICM) by turbulence driven by energetic mergers. We show that in such a framework radio halos are expected to be relatively common at ∼ 150 MHz (∼ 30 − 60%) in clusters with mass and redshift similar to PSZ2 G099.86+58.45; however, at least 2/3 of these radio halos should have steep spectrum and thus be very faint above ∼ 1 GHz frequencies. Furthermore, since the luminosity of radio halos at high redshift depends strongly on the magnetic field strength in the hosting clusters, future LOFAR observations will also provide vital information on the origin and amplification of magnetic fields in galaxy clusters.

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Section: Discussionmentioning

confidence: 86%

LOFAR Discovery of a Radio Halo in the High-redshift Galaxy Cluster PSZ2 G099.86+58.45

Cassano

Botteon

Gennaro

et al. 2019

ApJL

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“…Bonafede et al (2018) used the spectrum of density fluctuations from Chandra to suggest a different ratio of kinematic over thermal energy in the regions with and without extended radio halo in MACS J0717.5+3745, further strengthening the turbulent re-acceleration scenario. For a comprehensive review of the role of turbulence in magnetic field amplification and cosmic ray acceleration, we refer the reader to the chapters by Donnert et al (2018) and van Weeren et al (2019), included in this volume.…”

Section: Surface Brightness Fluctuations and Power Spectramentioning

confidence: 99%

Constraining Gas Motions in the Intra-Cluster Medium

et al. 2019

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The detailed velocity structure of the diffuse X-ray emitting intracluster medium (ICM) remains one of the last missing key ingredients in understanding the microphysical properties of these hot baryons and constraining our models of the growth and evolution of structure on the largest scales in the Universe. Direct measurements of the gas velocities from the widths and shifts of X-ray emission lines were recently provided for the central region of the Perseus Cluster of galaxies by Hitomi, and upcoming high-resolution Xray microcalorimeters onboard XRISM and Athena are expected to extend these studies to many more systems. In the mean time, several other direct and indirect methods have been proposed for estimating the velocity structure in the ICM, ranging from resonant scattering to X-ray surface brightness fluctuation analysis, the kinematic Sunyaev-Zeldovich effect, or using optical line emitting nebulae in the brightest cluster galaxies as tracers of the motions of the ambient plasma. Here, we review and compare the existing estimates of the velocities of the hot baryons, as well as the various overlapping physical processes that drive motions in the ICM, and discuss the implications of these measurements for constraining the viscosity and identifying the source of turbulence in clusters of galaxies.

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“…In such a context, future gamma-ray experiments as the Cherenkov Telescope Array, that will also provide time delay and halo measurements of the blazar emission, will strongly improve the lower limits on the amplitude of magnetic fields in voids and at the same time provide hints on a possible helical components [25][26][27]. On the other end of the observational frequency range, future high sensitivity radio observations will improve significantly the measurements of the magnetic fields in the cosmic structures [28][29][30][31][32] and will also have the capability to probe the presence of weak fields in the filaments of the large scale structure [33,34].…”

Section: Introductionmentioning

confidence: 99%

Constraints on primordial magnetic fields from magnetically-induced perturbations: current status and future perspectives with LiteBIRD and future ground based experiments

Paoletti

Finelli⋆

2019

J. Cosmol. Astropart. Phys.

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We present the constraints on the amplitude of magnetic fields generated prior to the recombination using CMB temperature and polarization anisotropy data from Planck 2018 release, alone and in combination with those from BICEP2/Keck array and the South Pole Telescope. We model the fields with a generic parametrization and we make no assumptions on their origin in order to provide general constraints on their characteristics. The analysis updates the former corresponding Planck 2015 results both on data and numerical implementation. We then perform forecasts for the next generation of CMB experiments such as LiteBIRD satellite alone and in combination with future ground based experiments.

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Magnetic Field Amplification in Galaxy Clusters and Its Simulation

Cited by 133 publications

References 302 publications

LOFAR Discovery of a Radio Halo in the High-redshift Galaxy Cluster PSZ2 G099.86+58.45

LOFAR Discovery of a Radio Halo in the High-redshift Galaxy Cluster PSZ2 G099.86+58.45

Constraining Gas Motions in the Intra-Cluster Medium

Constraints on primordial magnetic fields from magnetically-induced perturbations: current status and future perspectives with LiteBIRD and future ground based experiments

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