Conveners
Parallel - Galaxy Clusters & Magnetism: Groups, Clusters, LSS
- Valentina Vacca (INAF)
- Rossella Cassano (INAF)
Parallel - Galaxy Clusters & Magnetism: Magnetism, radio galaxies in high density environments
- Valentina Vacca (Istituto Nazionale di Astrofisica (INAF))
- Rossella Cassano (Istituto Nazionale di Astrofisica (INAF))
Parallel - Galaxy Clusters & Magnetism
- Valentina Vacca (Istituto Nazionale di Astrofisica (INAF))
- Rossella Cassano (Istituto Nazionale di Astrofisica (INAF))
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...
LOFAR is the most important pathfinder of SKA-low observing the radio sky at long wavelengths. One of the aims of both instruments is the study of diffuse synchrotron radio emission from galaxy clusters, such as radio halos that typically extend on large angular (∼2'-20') scales. The LOFAR Two Meter Sky Survey (LoTSS-DR2) recently provided the largest sample (309 targets) of mass-selected...
The nearby Coma galaxy cluster is a milestone for studying magnetic fields and particle acceleration processes in the intra-cluster medium (ICM). Recent LOFAR observations at 144 MHz have revealed new features in the extended radio emission of this cluster: a bridge connecting the halo to the cluster, a sharp radio front at the halo's edge, and an intriguing "accretion relic" lying beyond the...
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...
We present the results of observations at the frequency of 1.4 GHz performed with the Sardinia Radio Telescope of the galaxy cluster CL0217+70 and its surrounding region; we combine the obtained results with available interferometric observations at the same frequency performed with the Very Large Array.
We discuss the information that can be derived by combining single dish and...
One of the goals of the SKA precursors and pathfinders is to release high sensitivity and high resolution images of the faint polarized sky. This will allow us to constrain the origin and the evolution of large scale magnetic fields and to study in detail the properties of the faint radio sky. In this talk I will show a preview of the challenges and opportunities offered by the SKA1-mid future...
In this talk, I will present are results from LOFAR HBA observations of the mini halo in the clutter RBS797
The cluster is known to host a powerful AGN at its centre with two pairs of jet propagating in orthogonal directions. We have investigated the radio emission, classified as radio min halo, and its connection with the central AGN.
We have found an unexpected trend for the spectral index...
Jetted Active Galactic Nuclei (AGN) recurrently inflate lobes of relativistic plasma and magnetic fields, which are thought to rise buoyantly as light bubbles into the intragroup/intracluster medium, counterbalancing its spontaneous cooling. Understanding how these bubbles evolve and eventually mix with the surrounding gas on long timescales is important to constrain the impact they have on...
The LOw Frequency Array (LOFAR) is an interferometer that operates at frequencies between 10 and 240 MHz. The facility consists of 52 stations. 14 “international” stations are spread throughout Europe: they provide baselines of up to 1989 km, which yields an angular resolution of 0.27” at 150 MHz. Using the full International LOFAR Telescope (ILT) is however technically challenging in terms of...
