654 citations · 9.5k across the 164 of their papers we have counts for
17 papers · 1 filter
Gamma ray emission and stochastic particle acceleration in galaxy clusters
G. Brunetti, P. Blasi, R. Cassano +1
FERMI (formely GLAST) will shortly provide crucial information on relativistic particles in galaxy clusters. We discuss non-thermal emission in the context of general calculations…
A low-frequency radio halo associated with a cluster of galaxies
G. Brunetti, S. Giacintucci, R. Cassano +7
Clusters of galaxies are the largest gravitationally bound objects in the Universe, containing about 10^15 solar masses of hot (10^8 K) gas, galaxies and dark matter in a typical v…
A morphological comparison between giant radio halos and radio mini--halos in galaxy clusters
R. Cassano, M. Gitti, G. Brunetti
In this letter we present a morphological comparison between giant radio halos and radio mini-halos in galaxy clusters based on radio--X-ray luminosity, P_{1.4}-L_X, and radio lumi…
Shock acceleration as origin of the radio relic in A521?
S. Giacintucci, T. Venturi, G. Macario +6
We present new high sensitivity observations of the radio relic in A521 carried out with the Giant Metrewave Radio Telescope at 327 MHz and with the Very Large Array at 4.9 and 8.5…
GMRT Radio Halo Survey in galaxy clusters at z = 0.2 -- 0.4. II.The eBCS clusters and analysis of the complete sample
T. Venturi, S. Giacintucci, D. Dallacasa +4
We present the results of the GMRT cluster radio halo survey. The main purposes of our observational project are to measure which fraction of massive galaxy clusters in the redshif…
Revised statistics of radio halos and the re-acceleration model
R. Cassano, G. Brunetti, T. Venturi +4
Aims. The statistical properties of radio halos can be used to discriminate among the possible models for their origin. Therefore an unbiased and exhaustive investigation in this d…
Cosmic rays and Radio Halos in galaxy clusters : new constraints from radio observations
G. Brunetti, T. Venturi, D. Dallacasa +4
Clusters of galaxies are sites of acceleration of charged particles and sources of non-thermal radiation. We report on new constraints on the population of cosmic rays in the Intra…
Hard X-rays from Galaxy Clusters and SIMBOL-X
G. Brunetti, R. Cassano, G. Setti
Non thermal emission from galaxy clusters demonstrates the existence of relativistic particles and magnetic fields in the Intra Cluster Medium (ICM). Present instruments do not all…
New scaling relations in cluster radio halos and the re-acceleration model
R. Cassano, G. Brunetti, G. Setti +2
In this paper we derive new expected scaling relations for clusters with giant radio halos in the framework of the re-acceleration scenario in a simplified, but physically motivate…
Statistics of Giant Radio Halos from Electron Reacceleration Models
R. Cassano, G. Brunetti, G. Setti
The most important evidence of non-thermal phenomena in galaxy clusters comes from Giant Radio Halos (GRHs), synchrotron radio sources extended over Mpc scales, detected in a growi…
Turbulent Velocity Fields in SPH--simulated Galaxy Clusters
F. Vazza, G. Tormen, R. Cassano +2
We present a study of the turbulent velocity fields in the Intra Cluster Medium of a sample of 21 galaxy clusters simulated by the SPH--code Gadget2, using a new numerical scheme w…
Constraining B in galaxy clusters from statistics of giant radio halos
R. Cassano, G. Brunetti, G. Setti
There are several possibilities to constrain the value of the magnetic field in the ICM, the most direct ones being the combination of inverse Compton and synchrotron observations,…
The cluster relic source in A521
S. Giacintucci, T. Venturi, S. Bardelli +3
We present high sensitivity radio observations of the merging cluster A521, at a mean redsfhit z=0.247. The observations were carried out with the GMRT at 610 MHz and cover a regio…
Occurence and Luminosity Functions of Giant Radio Halos from Magneto-Turbulent Model
Rossella Cassano, Gianfranco Brunetti, Giancarlo Setti
We calculate the probability to form giant radio halos (~ 1 Mpc size) as a function of the mass of the host clusters by using a Statistical Magneto-Turbulent Model (Cassano & Brune…
Cluster Mergers and Non-Thermal Phenomena: A Statistical Magneto-Turbulent Model
Rossella Cassano, Gianfranco Brunetti
With the aim to investigate the statistical properties and the connection between thermal and non-thermal properties of the ICM in galaxy clusters, we have developed a statistical…
Cluster Mergers, Radio Halos and Hard X-ray Tails: A Statistical Magneto-Turbulent Model
R. Cassano, G. Brunetti
There is now firm evidence that the ICM consists of a mixture of hot plasma, magnetic fields and relativistic particles. The most important evidences for non-thermal phenomena in g…
Alfvenic reacceleration of relativistic particles in galaxy clusters: MHD waves, leptons and hadrons
Gianfranco Brunetti, Pasquale Blasi, Rossella Cassano +1
There is a growing evidence that extended radio halos are most likely generated by electrons reaccelerated via some kind of turbulence generated in the cluster volume during major…