Nonthermal phenomena in clusters of galaxies
arXiv:0801.0982 · doi:10.1007/s11214-008-9314-7
Abstract
Recent observations of high energy (> 20 keV) X-ray emission in a few clusters of galaxies broaden our knowledge of physical phenomena in the intracluster space. This emission is likely to be nonthermal, probably resulting from Compton scattering of relativistic electrons by the cosmic microwave background (CMB) radiation. Direct evidence for the presence of relativistic electrons in some 50 clusters comes from measurements of extended radio emission in their central regions. We briefly review the main results from observations of extended regions of radio emission, and Faraday rotation measurements of background and cluster radio sources. The main focus of the review are searches for nonthermal X-ray emission conducted with past and currently operating satellites, which yielded appreciable evidence for nonthermal emission components in the spectra of a few clusters. This evidence is clearly not unequivocal, due to substantial observational and systematic uncertainties, in addition to virtually complete lack of spatial information. If indeed the emission has its origin in Compton scattering of relativistic electrons by the CMB, then the mean magnetic field strength and density of relativistic electrons in the cluster can be directly determined. Knowledge of these basic nonthermal quantities is valuable for the detailed description of processes in intracluster gas and for the origin of magnetic fields.
23 pages, 7 figures, accepted for publication in Space Science Reviews, special issue "Clusters of galaxies: beyond the thermal view", Editor J.S. Kaastra, Chapter 5; work done by an international team at the International Space Science Institute (ISSI), Bern, organised by J.S. Kaastra, A.M. Bykov, S. Schindler & J.A.M. Bleeker
References in corpus (52)
- ISGRI: the INTEGRAL Soft Gamma-Ray Imager
- Cluster Magnetic Fields
- Hard X-ray Detector (HXD) on Board Suzaku
- Properties of the Intracluster Medium in an Ensemble of Nearby Galaxy Clusters
- The distribution of absorbing column densities among Seyfert 2 galaxies
- A New Radio - X-Ray Probe of Galaxy Cluster Magnetic Fields
- Magnetic Field in Clusters of Galaxies
- On The Non Thermal Emission and Acceleration of Electrons in Coma and Other Clusters of Galaxies
- XMM-Newton observation of the Lockman Hole; I. The X-ray Data
- Observations of extended radio emission in clusters
- In-Orbit Performance of the Hard X-ray Detector on board Suzaku
- The Energy Spectrum of Primary Cosmic Ray Electrons in Clusters of Galaxies and Inverse Compton Emission
- Radio Halo and Relic Candidates from the NRAO VLA Sky Survey
- Cosmic Rays, Radio Halos and Non-Thermal X-ray Emission in Clusters of Galaxies
- Magnetic Fields and Faraday Rotation in Clusters of Galaxies
- Hard X-Ray Radiation in the Coma Cluster Spectrum
- A deeper X-ray study of the core of the Perseus galaxy cluster: the power of sound waves and the distribution of metals and cosmic rays
- Halo and Relic Sources in Clusters of Galaxies
- EGRET upper limits on the high-energy gamma-ray emission of galaxy clusters
- The diffuse radio emission from the Coma cluster at 2.675 GHz and 4.85 GHz
- XMM- Newton Observation of the Coma Galaxy Cluster: The temperature structure in the central region
- Measuring the Cluster Magnetic Field Power Spectra from Faraday Rotation Maps of Abell 400, Abell 2634 and Hydra A
- Correlation of the magnetic field and the intra-cluster gas density in galaxy clusters
- The dynamical state of the Coma cluster with XMM-Newton
- Confirmation of non-thermal hard X-ray excess in the Coma cluster from two epoch observations
- Hard X-ray emission from the galaxy cluster A2256
- High- and low energy nonthermal X-ray emission from the cluster of galaxies A 2199
- Particle acceleration mechanisms
- Lowering Inferred Cluster Magnetic Field Strengths - the radio galaxy contributions
- Is there a hard tail in the Coma Cluster X-ray spectrum?
- Results from a Second RXTE Observation of the Coma Cluster
- Faraday Rotation Observations of Magnetic Fields in galaxy Clusters
- Non-thermal hard X-ray emission in galaxy clusters observed with the BeppoSAX PDS
- Hard X-ray emission from the galaxy cluster A3667
- Nonthermal radiation mechanisms
- Are the Faraday Rotating Magnetic Fields Local to Intracluster Radio Galaxies?
- The BeppoSAX view of the hot cluster Abell 2319
- Long RXTE Observations of A2163
- Nonthermal hard X-ray excess in the Coma cluster: resolving the discrepancy between the results of different PDS data analyses
- Quantification of Uncertainty in the Measurement of Magnetic Fields in Clusters of Galaxies
- Detection of Excess Hard X-ray Emission from the Group of Galaxies HCG62
- Hard X-ray and radio observations of Abell 754
- Analysis and Interpretation of Hard X-ray Emission from the Bullet Cluster (1E0657-56), the Most Distant Cluster of Galaxies Observed by RXTE
- Nonthermal hard X-ray excess in the cluster Abell 2256 from two epoch observations
- New radio halos and relics in clusters of galaxies
- RXTE and ASCA Constraints on Non-thermal Emission from the A2256 Galaxy Cluster
- South-West extension of the hard X-ray emission from the Coma cluster
- RXTE Hard X-ray Observation of A754: Constraining the Hottest Temperature Component and the Intracluster Magnetic Field
- Coma revealed as an extended hard X-rays source by INTEGRAL IBIS/ISGRI
- Hard X-Ray Properties of Groups of Galaxies as Observed with ASCA
- A BeppoSax view of the Centaurus Cluster
- Spectral Analysis of RXTE Observations of A3667
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- The Large Area Telescope on the Fermi Gamma-ray Space Telescope Mission
- Diffuse Radio Emission from Galaxy Clusters
- Science with e-ASTROGAM (A space mission for MeV-GeV gamma-ray astrophysics)
- NuSTAR Observations of the Bullet Cluster: Constraints on Inverse Compton Emission
- GMRT Radio Halo Survey in galaxy clusters at z = 0.2 -- 0.4. II.The eBCS clusters and analysis of the complete sample
- GeV Gamma-ray Flux Upper Limits from Clusters of Galaxies
- MAGIC Gamma-ray Telescope Observation of the Perseus Cluster of Galaxies: implications for cosmic rays, dark matter, and NGC1275
- Magnetic Fields, Relativistic Particles, and Shock Waves in Cluster Outskirts
- Search for gamma-ray emission from the Coma Cluster with six years of Fermi-LAT data
- Diffuse radio emission from clusters in the MareNostrum Universe simulation
- A search for diffuse radio emission in the relaxed, cool-core galaxy clusters A1068, A1413, A1650, A1835, A2029, and Ophiuchus
- Using Radio Halos and Minihalos to Measure the Distributions of Magnetic Fields and Cosmic-Rays in Galaxy Clusters
- Galaxy Clusters in the Swift/BAT era: Hard X-rays in the ICM
- Rotation Measures of Radio Sources in Hot Galaxy Clusters
- Non-thermal processes in cosmological simulations
- Constraining Cosmic Rays and Magnetic Fields in the Perseus Galaxy Cluster with TeV observations by the MAGIC telescopes
- Probing the cosmic-ray content of galaxy clusters by stacking Fermi-LAT count maps
- Deep observation of the NGC 1275 region with MAGIC: search of diffuse gamma-ray emission from cosmic rays in the Perseus cluster
- Magnetic fields and cosmic rays in clusters of galaxies
- GMRT observations of the Ophiuchus galaxy cluster
- A NuSTAR observation of the center of the Coma Cluster
- Cosmic Magnetism in Centimeter and Meter Wavelength Radio Astronomy
- Soft X-ray and extreme ultraviolet excess emission from clusters of galaxies
- A joint XMM-NuSTAR observation of the galaxy cluster Abell 523: constraints on Inverse Compton emission
- Multiwavelength Astronomy and CTA: X-rays
- Particle energy cascade in the Intergalactic Medium
- Constraining the dark matter contribution of rays in Cluster of galaxies using Fermi-LAT data
- Synchrotron Intensity Gradient Revealing Magnetic Fields in Galaxy Clusters
- Non-thermal emission in the core of Perseus: results from a long XMM-Newton observation
- X-ray Spectroscopy of Clusters of Galaxies
- Hard X-ray emission from accretion shocks around galaxy clusters
- Multi-wavelength mock observations of the WHIM in a simulated galaxy cluster
- Low-frequency radio study of MACS clusters at 610 and 235 MHz using the GMRT
- Inverse-Compton Emission from Clusters of Galaxies: Predictions for ASTRO-H
- Clusters of galaxies: setting the stage
- X-ray spectroscopy of galaxy clusters: beyond the CIE modeling
- Gamma Rays from Star Formation in Clusters of Galaxies
- Supermodel Analysis of the Hard X-Ray Excess in the Coma Cluster
- Dispersal of Galactic Magnetic Fields into Intracluster Space
- Stochastic particle acceleration and the problem of backgroud plasma overheating
- Galactic Energetic Particles and Their Radiative Yields in Clusters
- Optical inverse-Compton emission from clusters of galaxies
- Acceleration of Thermal Protons By Generic Phenomenological Mechanisms
- Exploring the role of cosmological shock waves in the Dianoga simulations of galaxy clusters
- The Gamma-Ray Background Constrains the Origins of the Radio and X-Ray Backgrounds
- The End of the Rainbow: What Can We Say About the Extragalactic Sub-Megahertz Radio Sky?
- Possible non-thermal origin of the hard X-ray emission in the merging galaxy cluster SPT-CL J2031-4037
- Hard X-ray Emission from the NGC 5044 Group
- Nonthermal Emission from Star-Forming Galaxies