576 citations · 12k across the 198 of their papers we have counts for
30 papers · 1 filter
The deepest view of RBS 797: evidence for two pairs of equidistant X-ray cavities
Francesco Ubertosi, Myriam Gitti, Fabrizio Brighenti +14
We present the first results of a deep observation of the galaxy cluster RBS 797, whose previous X-ray studies revealed two pronounced X-ray cavities in the east-west (E-…
The ultra-steep diffuse radio emission observed in the cool-core cluster RX J1720.1+2638 with LOFAR at 54 MHz
N. Biava, F. de Gasperin, A. Bonafede +17
Diffuse radio emission at the centre of galaxy clusters has been observed both in merging clusters on scales of Mpc, called giant radio haloes, and in relaxed systems with a cool-c…
Spectral analysis of spatially-resolved 3C295 (sub-arcsecond resolution) with the International LOFAR Telescope
Etienne Bonnassieux, Frits Sweijen, Marisa Brienza +11
3C295 is a bright, compact steep spectrum source with a well-studied integrated radio spectral energy distribution (SED) from 132 MHz to 15 GHz. However, spatially resolved spectra…
Origin of the ring structures in Hercules A -- Sub-arcsecond 144 MHz to 7 GHz observations
R. Timmerman, R. J. van Weeren, J. R. Callingham +18
The prominent radio source Hercules A features complex structures in its radio lobes. Although it is one of the most comprehensively studied sources in the radio sky, the origin of…
Pushing subarcsecond resolution imaging down to 30 MHz with the trans-European International LOFAR Telescope
C. Groeneveld, R. J. van Weeren, G. K. Miley +12
Relatively little information is available about the Universe at ultra-low radio frequencies, i.e. below 50 MHz (ULF), although the ULF spectral window contains a wealth of unique…
Physical insights from the spectrum of the radio halo in MACS J0717.5+3745
K. Rajpurohit, G. Brunetti, A. Bonafede +18
We present new LOFAR observations of the massive merging galaxy cluster MACS J0717.5+3745. The cluster hosts the most powerful radio halo known to date. These new observations, in…
Understanding the radio relic emission in the galaxy cluster MACS J0717.5+3745: spectral analysis
K. Rajpurohit, D. Wittor, R. J. van Weeren +21
Radio relics are diffuse, extended synchrotron sources that originate from shock fronts generated during cluster mergers. The massive merging galaxy cluster MACS J0717.5+3745 hosts…
The great Kite in the sky: a LOFAR observation of the radio source in Abell 2626
A. Ignesti, T. Shimwell, G. Brunetti +15
The radio source at the center of the galaxy cluster Abell 2626, also known as the Kite, stands out for its unique morphology composed of four, symmetric arcs. Previous studies hav…
A giant radio bridge connecting two clusters in Abell 1758
A. Botteon, R. J. van Weeren, G. Brunetti +14
Collisions between galaxy clusters dissipate enormous amounts of energy in the intra-cluster medium (ICM) through turbulence and shocks. In the process, Mpc-scale diffuse synchrotr…
LOFAR Observations of X-ray Cavity Systems
L. Bîrzan, D. A. Rafferty, M. Brüggen +8
We present LOFAR observations at 120-168 MHz of 42 systems with possible X-ray cavities in their hot atmosphere, of which 17 are groups or ellipticals, 19 are nearby clusters (z<0.…
The beautiful mess in Abell 2255
A. Botteon, G. Brunetti, R. J. van Weeren +18
We present LOFAR observations of one of the most spectacular objects in the radio sky: Abell 2255. This is a nearby () merging galaxy cluster hosting one of the first r…
Low-frequency observations of the Giant Radio Galaxy NGC 6251
T. M. Cantwell, J. D. Bray, J. H. Croston +22
We present LOFAR observations at 150 MHz of the borderline FRI/FRII giant radio galaxy NGC 6251. This paper presents the most sensitive and highest-resolution images of NGC 6251 at…
LOFAR discovery of a radio halo in the high-redshift galaxy cluster PSZ2 G099.86+58.45
R. Cassano, A. Botteon, G. Di Gennaro +15
In this Letter, we report the discovery of a radio halo in the high-redshift galaxy cluster PSZ2 G099.86+58.45 () with the LOw Frequency ARray (LOFAR) at 120-168 MHz. This…
Signatures from a merging galaxy cluster and its AGN population: LOFAR observations of Abell 1682
A. O. Clarke, A. M. M. Scaife, T. Shimwell +13
We present LOFAR data from 110--180~MHz of the merging galaxy cluster Abell 1682, alongside archival optical, radio and X-ray data. Our 6 arc-second resolution images at low freque…
A radio ridge connecting two galaxy clusters in a filament of the cosmic web
F. Govoni, E. Orrù, A. Bonafede +26
Galaxy clusters are the most massive gravitationally bound structures in the Universe. They grow by accreting smaller structures in a merging process that produces shocks and turbu…
Deep LOFAR 150 MHz imaging of the Boötes field: Unveiling the faint low-frequency sky
E. Retana-Montenegro, H. J. A. Röttgering, T. W. Shimwell +5
We have conducted a deep survey (with a central rms of ) with the LOw Frequency ARray (LOFAR) at 120-168 MHz of the Boötes field, with an angular resolution of $3.9…
First evidence of diffuse ultra-steep-spectrum radio emission surrounding the cool core of a cluster
Federica Savini, Annalisa Bonafede, Marcus Brueggen +14
Diffuse synchrotron radio emission from cosmic-ray electrons is observed at the center of a number of galaxy clusters. These sources can be classified either as giant radio halos,…
LOFAR discovery of radio emission in MACSJ0717.53745
A. Bonafede, M. Brüggen, D. Rafferty +16
We present results from LOFAR and GMRT observations of the galaxy cluster MACSJ0717.53745. The cluster is undergoing a violent merger involving at least four sub-clusters, a…
The mystery of the 'Kite' radio source in Abell 2626: insights from new Chandra observations
A. Ignesti, M. Gitti, G. Brunetti +3
We present the results of a new Chandra study of the galaxy cluster A2626. The radio emission of the cluster shows a complex system of four symmetric arcs without known correlation…
Studying the late evolution of a radio-loud AGN in a galaxy group with LOFAR
Federica Savini, Annalisa Bonafede, Marcus Brüggen +17
Feedback by radio-loud active galactic nuclei (AGN) in galaxy groups is not fully understood. Open questions include the duty cycle of the AGN, the spatial extent of the radio lobe…
LOFAR reveals the giant: a low-frequency radio continuum study of the outflow in the nearby FR I radio galaxy 3C 31
V. Heesen, J. H. Croston, R. Morganti +21
We present a deep, low-frequency radio continuum study of the nearby Fanaroff--Riley class I (FR I) radio galaxy 3C 31 using a combination of LOw Frequency ARray (LOFAR; 30--85 and…
LOFAR discovery of an ultra-steep radio halo and giant head-tail radio galaxy in Abell 1132
A. Wilber, M. Brüggen, A. Bonafede +16
LOFAR observations at 144 MHz have revealed large-scale radio sources in the unrelaxed galaxy cluster Abell 1132. The cluster hosts diffuse radio emission on scales of 650 kp…
New giant radio sources and underluminous radio halos in two galaxy clusters
V. Cuciti, G. Brunetti, R. van Weeren +5
The aim of this work is to analyse the radio properties of the massive and dynamical disturbed clusters Abell 1451 and Zwcl 0634.1+4750, especially focusing on the possible presenc…
Deep LOFAR observations of the merging galaxy cluster CIZA J2242.8+5301
D. N. Hoang, T. W. Shimwell, A. Stroe +20
Previous studies have shown that CIZA J2242.8+5301 (the 'Sausage' cluster, ) is a massive merging galaxy cluster that hosts a radio halo and multiple relics. In this paper…