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The LOFAR Two-metre Sky Survey: Deep Fields Data Release 2. I. The ELAIS-N1 field
T. W. Shimwell, C. L. Hale, P. N. Best +29
We present the final 6'' resolution data release of the ELAIS-N1 field from the LOw-Frequency ARray (LOFAR) Two-metre Sky Survey Deep Fields project (LoTSS Deep). The 144MHz images…
Mind the Gap between A2061 and A2067: Unveiling new diffuse large-scale radio emission
G. V. Pignataro, A. Bonafede, G. Bernardi +11
The clusters Abell 2061 and Abell 2067 in the Corona Borealis supercluster have been studied at different radio frequencies and are both known to host diffuse radio emission. The a…
First evidence of a connection between cluster-scale diffuse radio emission in cool-core galaxy clusters and sloshing features
N. Biava, A. Bonafede, F. Gastaldello +15
Radio observations of a few cool-core galaxy clusters have revealed the presence of diffuse emission on cluster scales, similar to what was found in merging clusters in the form of…
Weakly interacting massive particle cross section limits from LOFAR observations of dwarf spheroidal galaxies
L. Gajović, F. Welzmüller, V. Heesen +8
Weakly interacting massive particles (WIMPs) can self-annihilate, thus providing us with a way to indirectly detect dark matter (DM). Dwarf spheroidal (dSph) galaxies are excellent…
The Planck clusters in the LOFAR sky VI. LoTSS-DR2: Properties of radio relics
A. Jones, F. de Gasperin, V. Cuciti +19
Context. It is well-established that shock waves in the intracluster medium launched by galaxy cluster mergers can produce synchrotron emission, which is visible to us at radio fre…
The Faraday Rotation Measure Grid of the LOFAR Two-metre Sky Survey: Data Release 2
S. P. O'Sullivan, T. W. Shimwell, M. J. Hardcastle +24
A Faraday rotation measure (RM) catalogue, or RM Grid, is a valuable resource for the study of cosmic magnetism. Using the second data release (DR2) from the LOFAR Two-metre Sky Su…
The Planck clusters in the LOFAR sky. III. LoTSS-DR2: Dynamic states and density fluctuations of the intracluster medium
X. Zhang, A. Simionescu, F. Gastaldello +19
The footprint of LoTSS-DR2 covers 309 PSZ2 galaxy clusters, 83 of which host a radio halo and 26 host a radio relic(s). It provides us an excellent opportunity to statistically stu…
Galaxy clusters enveloped by vast volumes of relativistic electrons
V. Cuciti, F. de Gasperin, M. Brueggen +12
The central regions of galaxy clusters are permeated by magnetic fields and filled with relativistic electrons. When clusters merge, the magnetic fields are amplified and relativis…
Abell 1033: Radio halo and gently reenergized tail at 54 MHz
H. W. Edler, F. de Gasperin, G. Brunetti +7
Abell 1033 is a merging galaxy cluster of moderate mass (). It hosts a broad variety of diffuse radio sources linked to different astroph…
Diffuse radio emission from non-Planck galaxy clusters in the LoTSS-DR2 fields
D. N. Hoang, M. Brüggen, A. Botteon +17
The presence of large-scale magnetic fields and ultra-relativistic electrons in the intra-cluster medium (ICM) is confirmed through the detection of diffuse radio synchrotron sourc…
The Planck clusters in the LOFAR sky. I. LoTSS-DR2: new detections and sample overview
A. Botteon, T. W. Shimwell, R. Cassano +23
Relativistic electrons and magnetic fields permeate the intra-cluster medium (ICM) and manifest themselves as diffuse sources of synchrotron emission observable at radio wavelength…
Deep low-frequency radio observations of Abell 2256 I: The filamentary radio relic
K. Rajpurohit, R. J. van Weeren, M. Hoeft +22
We present deep and high fidelity images of the merging galaxy cluster Abell 2256 at low frequencies, using the upgraded Giant Metrewave Radio Telescope (uGMRT) and LOw-Frequency A…
Turbulent magnetic fields in the merging galaxy cluster MACS J0717.5+3745: polarization analysis
K. Rajpurohit, M. Hoeft, D. Wittor +20
We present wideband polarimetric observations, obtained with the Karl G. Jansky Very Large Array (VLA), of the merging galaxy cluster MACS J0717.5+3745, which hosts one of the most…
Dissecting nonthermal emission in the complex multiple-merger galaxy cluster Abell 2744: Radio and X-ray analysis
K. Rajpurohit, F. Vazza, R. J. van Weeren +14
We present the first deep low frequency radio observations of the massive and highly disturbed galaxy cluster Abell 2744 using the upgraded Giant Metrewave Radio Telescope (uGMRT).…
Nonthermal phenomena in the center of Abell 1775: An 800 kpc head-tail, revived fossil plasma and slingshot radio halo
A. Botteon, S. Giacintucci, F. Gastaldello +15
Thermal gas in the center of galaxy clusters can show substantial motions that generate surface-brightness and temperature discontinuities known as cold fronts. The motions may be…
The Coma cluster at LOFAR frequencies I: insights into particle acceleration mechanisms in the radio bridge
A. Bonafede, G. Brunetti, F. Vazza +18
Radio synchrotron emission from the bridges of low-density gas connecting galaxy clusters and groups is a challenge for particle acceleration processes. In this work, we analyse th…
The contribution of discrete sources to the sky temperature at 144 MHz
M. J. Hardcastle, T. W. Shimwell, C. Tasse +7
In recent years, the level of the extragalactic radio background has become a point of considerable interest, with some lines of argument pointing to an entirely new cosmological s…
Abell 1430: A merging cluster with exceptional diffuse radio emission
M. Hoeft, C. Dumba, A. Drabent +16
Diffuse radio emission has been found in many galaxy clusters, predominantly in massive systems which are in the state of merging. The radio emission can usually be classified as r…
A perfect power-law spectrum even at highest frequencies: The Toothbrush relic
K. Rajpurohit, F. Vazza, M. Hoeft +12
Radio relics trace shock fronts generated in the intracluster medium (ICM) during cluster mergers. The particle acceleration mechanism at the shock fronts is not yet completely und…
Ultra-steep spectrum emission in the merging galaxy cluster Abell 1914
S. Mandal, H. T. Intema, T. W. Shimwell +14
A number of radio observations have revealed the presence of large synchrotron-emitting sources associated with the intra-cluster medium. There is strong observational evidence tha…
A LOFAR study of non-merging massive galaxy clusters
Federica Savini, Annalisa Bonafede, Marcus Brueggen +15
Centrally located diffuse radio emission has been observed in both merging and non-merging galaxy clusters. Depending on their morphology and size, we distinguish between giant rad…
The spectacular cluster chain Abell 781 as observed with LOFAR, GMRT, and XMM-Newton
A. Botteon, T. W. Shimwell, A. Bonafede +20
A number of merging galaxy clusters show the presence of large-scale radio emission associated with the intra-cluster medium (ICM). These synchrotron sources are generally classifi…