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August 2015 (v1)Journal articleUploaded on: December 3, 2022
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June 9, 2014 (v1)Conference paper
The detection of the diffuse gas component of the cosmic web remains a formidable challenge. In this work we study synchrotron emission from the cosmic web with simulated SKA1 observations, which can represent an fundamental probe of the warm-hot intergalactic medium. We investigate radio emission originated by relativistic electrons...
Uploaded on: December 3, 2022 -
June 9, 2014 (v1)Conference paper
The presence of magnetic fields in galaxy clusters has been well established in recent years, and their importance for the understanding of the physical processes at work in the Intra Cluster Medium has been recognized. Halo and relic sources have been detected in several tens clusters. A strong correlation is present between the halo and relic...
Uploaded on: December 3, 2022 -
2019 (v1)Journal article
Future observations with next-generation radio telescopes will help us to understand the presence and evolution of magnetic fields in galaxy clusters through determination of the so-called rotation measure (RM). In this work, we applied the RM synthesis technique to synthetic first phase Square Kilometre Array mid frequency element (i.e. the...
Uploaded on: December 4, 2022 -
June 9, 2014 (v1)Conference paper
We investigate the possibility for the SKA to detect and study the magnetic fields in galaxy clusters and in the less dense environments surrounding them using Faraday Rotation Measures. To this end, we produce 3-dimensional magnetic field models for galaxy clusters of different masses and in different stages of their evolution, and derive mock...
Uploaded on: December 3, 2022 -
2018 (v1)Journal article
We present results from Low-Frequency Array (LOFAR) and Giant Meterwave Radio Telescope (GMRT) observations of the galaxy cluster MACS J0717.5+3745. The cluster is undergoing a violent merger involving at least four sub-clusters, and it is known to host a radio halo. LOFAR observations reveal new sources of radio emission in the Intra-Cluster...
Uploaded on: December 4, 2022 -
2017 (v1)Journal article
Previous studies have shown that CIZA J2242.8+5301 (the 'Sausage' cluster, z = 0.192) is a massive merging galaxy cluster that hosts a radio halo and multiple relics. In this paper, we present deep, high-fidelity, low-frequency images made with the LOw-Frequency Array (LOFAR) between 115.5 and 179 MHz. These images, with a noise of...
Uploaded on: February 28, 2023 -
June 9, 2014 (v1)Conference paper
Galaxy clusters are unique laboratories to investigate turbulent fluid motions and large scale magnetic fields. Synchrotron radio halos at the center of merging galaxy clusters provide the most spectacular and direct evidence of the presence of relativistic particles and magnetic fields associated with the intracluster medium. The study of...
Uploaded on: December 3, 2022 -
June 9, 2014 (v1)Conference paper
Galaxy clusters are known to host a variety of extended radio sources: tailed radio galaxies whose shape is modelled by the interaction with the intra-cluster medium (ICM); radio bubbles filling cavities in the ICM distribution and rising buoyantly through the thermal gas; diffuse giant radio sources ("halos" and "relics") revealing the...
Uploaded on: December 3, 2022 -
2011 (v1)Journal article
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Uploaded on: December 3, 2022 -
May 2013 (v1)Journal article
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Uploaded on: December 3, 2022 -
June 7, 2019 (v1)Journal article
A radio ridge between two galaxy clusters Galaxy clusters contain dozens or hundreds of galaxies, vast quantities of hot gas, and large amounts of dark matter. The gas can emit at radio wavelengths if it contains electrons at relativistic speeds, which can be injected by active galaxies or accelerated during a merger between two clusters....
Uploaded on: December 3, 2022 -
2012 (v1)Journal article
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April 13, 2016 (v1)Journal article
With Low-Frequency Array (LOFAR) observations, we have discovered a diverse assembly of steep spectrum emission that is apparently associated with the intracluster medium (ICM) of the merging galaxy cluster Abell 2034. Such a rich variety of complex emission associated with the ICM has been observed in few other clusters. This not only...
Uploaded on: December 3, 2022 -
2017 (v1)Journal articleSardinia Radio Telescope observations of Abell 194 - the intra-cluster magnetic field power spectrum
Aims. We study the intra-cluster magnetic field in the poor galaxy cluster Abell 194 by complementing radio data, at different frequencies, with data in the optical and X-ray bands.Methods. We analyzed new total intensity and polarization observations of Abell 194 obtained with the Sardinia Radio Telescope (SRT). We used the SRT data in...
Uploaded on: February 28, 2023 -
2017 (v1)Journal article
We present a new analysis of the widely used relation between cavity power and radio luminosity in clusters of galaxies with evidence for strong AGN feedback. We studied the correlation at low radio frequencies using two new surveys – the first alternative data release of the TIFR GMRT Sky Survey (TGSS ADR1) at 148 MHz and LOFAR's firstall-sky...
Uploaded on: February 28, 2023 -
2011 (v1)Journal article
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Uploaded on: December 3, 2022 -
February 20, 2016 (v1)Journal article
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Uploaded on: December 3, 2022 -
March 1, 2016 (v1)Journal article
LOFAR, the Low-Frequency Array, is a powerful new radio telescope operating between 10 and 240 MHz. LOFAR allows detailed sensitive high-resolution studies of the low-frequency radio sky. At the same time LOFAR also provides excellent short baseline coverage to map diffuse extended emission. However, producing high-quality deep images is...
Uploaded on: December 3, 2022 -
April 2013 (v1)Journal article
Some radio pulsars show clear 'drifting subpulses', in which subpulses are seen to drift in pulse longitude in a systematic pattern. Here we examine how the drifting subpulses of PSR B0809+74 evolve with time and observing frequency. We show that the subpulse period (P3) is constant on timescales of days, months and years, and between 14-5100...
Uploaded on: February 28, 2023