Conveners
Clusters/LSS
- Annalisa Bonafede (University of Bologna - Department of Physics and Astronomy)
Clusters/LSS
- There are no conveners in this block
Using broadband radio polarimetry we can probe regions of diffuse ionised and magnetised gas that are challenging to detect by other means, such as in the halos of galaxies (CGM), galaxy clusters (ICM), and filaments of the cosmic web (ie. WHIM). Here I will highlight recent results from the LOFAR and ASKAP radio telescopes, that use the effect of Faraday rotation to illuminate the CGM, ICM...
Many galaxy clusters show diffuse cluster-scale emission in the form of radio halos and relics, showing that magnetic fields and relativistic electrons are mixed in with the intracluster medium (ICM). Although there is broad consensus that the formation of these sources is connected to turbulence and shocks in the ICM, the details of particle acceleration, magnetic field and sources of highly...
The MeerKAT Exploration of Relics, Giant Halos, and Extragalactic Radio Sources (MERGHERS) survey is targeting a homogeneously selected sample of SZ-detected galaxy clusters with the aim of probing the cosmic and mass evolution of diffuse cluster radio emission. Almost all statistical cluster samples studied for diffuse radio emission are restricted to low-redshift, high-mass clusters due to...
In this talk, I will present the first homogeneous X-ray and radio study of galaxy clusters using LOFAR, MeerKAT and CHEX-MATE XMM observations.
Past studies have shown the presence of radio-X-ray connections in galaxy clusters and used them to derive constraints on cluster energetics and particle (re-)acceleration. However, many aspects of these processes are yet to be understood. With the...
While merging massive galaxy clusters are among some of the most spectacular events in the Universe, the majority of galaxies reside not in these behemoths, but in smaller structures such as poor clusters and galaxy groups. In these lower-mass environments, phenomena related to active galactic nuclei (AGN) and member galaxies play a more significant role in the enrichment and evolution of the...
Radio halos are formed in the central regions of galaxy clusters as a result of turbulence caused by the merging of clusters. These halos occur when relativistic electrons in the Intracluster medium emit synchrotron radiation. The connection between the radio halos and the dynamics of galaxy cluster has been established but the spectral properties of radio halos have not been tested...
A number of galaxy clusters show extended, diffuse, synchrotron emission in their central region. These sources are called radio halos, and are produced by the (re-)acceleration of relativistic seed electrons that fill the magnetised plasma halo of galaxy clusters. However, the nature of the re-acceleration mechanism is unclear. The current leading scenario is based on second order Fermi...
Evidence of radio synchrotron emission from bridges of low-density gas connecting pairs of galaxy clusters allows us to trace the filaments of the so-called cosmic web, along which the accretion of matter on galaxy clusters happens. The origin of the seed particles for the radio emission on Mpc- and over scales, is still not well understood. We aim to a more comprehensive understanding of the...
