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The SKA View of Cool-core Clusters: Evolution of Radio Mini-halos and AGN Feedback
Myriam Gitti, Paolo Tozzi, Francesco Ubertosi +12
In about 70 per cent of relaxed, cool-core galaxy clusters, the brightest cluster galaxy (BCG) is radio loud, showing non-thermal radio jets and lobes ejected by the central active…
ATCA observations of the MACS-Planck Radio Halo Cluster Project II. Radio observations of an intermediate redshift cluster sample
G. Martinez Aviles, M. Johnston-Hollitt, C. Ferrari +16
A fraction of galaxy clusters host diffuse radio sources whose origins are investigated through multi-wavelength studies of cluster samples. We investigate the presence of diffuse…
ATCA observations of the MACS-Planck Radio Halo Cluster Project - I. New detection of a radio halo in PLCK G285.0-23.7
Gerardo Martinez Aviles, Chiara Ferrari, Melanie Johnston-Hollitt +12
We investigate the possible presence of diffuse radio emission in the intermediate redshift, massive cluster PLCK G285.0-23.7 (z=0.39, M_500 = 8.39 x 10^(14) M_Sun). Our 16cm-band…
The Extended GMRT Radio Halo Survey II: Further results and analysis of the full sample
R. Kale, T. Venturi, S. Giacintucci +6
The intra-cluster medium contains cosmic rays and magnetic fields that are manifested through the large scale synchrotron sources, termed as radio halos, relics and mini-halos. The…
The SKA view of cool-core clusters: evolution of radio mini-halos and AGN feedback
Myriam Gitti, Paolo Tozzi, Gianfranco Brunetti +10
In about 70% of the population of relaxed, cool-core galaxy clusters, the brightest cluster galaxy (BCG) is radio loud, showing non-thermal radio jets and lobes ejected by the cent…
Discovery of large-scale diffuse radio emission and of a new galaxy cluster in the surroundings of MACSJ0520.7-1328
G. Macario, H. T. Intema, C. Ferrari +11
We report the discovery of large-scale diffuse radio emission South-East of the galaxy cluster MACS J0520.7-1328, detected through high sensitivity Giant Metrewave Radio Telescope…
The brightness and spatial distributions of terrestrial radio sources
A. R. Offringa, A. G. de Bruyn, S. Zaroubi +75
Faint undetected sources of radio-frequency interference (RFI) might become visible in long radio observations when they are consistently present over time. Thereby, they might obs…
The Extended GMRT Radio Halo Survey I: New upper limits on radio halos and mini-halos
R. Kale, T. Venturi, S. Giacintucci +5
A fraction of galaxy clusters host diffuse radio sources called radio halos, radio relics and mini-halos. We present the sample and first results from the Extended GMRT Radio Halo…
153 MHz GMRT follow-up of steep-spectrum diffuse emission in galaxy clusters
G. Macario, T. Venturi, H. T. Intema +7
In this paper we present new high sensitivity 153 MHz Giant Meterwave Radio Telescope follow-up observations of the diffuse steep spectrum cluster radio sources in the galaxy clust…
Low frequency follow up of radio halos and relics in the GMRT Radio Halo Cluster Survey
Tiziana Venturi, Simona Giacintucci, Daniele Dallacasa +4
We performed GMRT low frequency observations of the radio halos, relics and new candidates belonging to the GMRT Radio Halo Cluster Sample first observed at 610 MHz. High sensitivi…
First LOFAR results on galaxy clusters
C. Ferrari, I. van Bemmel, A. Bonafede +21
Deep radio observations of galaxy clusters have revealed the existence of diffuse radio sources related to the presence of relativistic electrons and weak magnetic fields in the in…
First LOFAR observations at very low frequencies of cluster-scale non-thermal emission: the case of Abell 2256
R. J. van Weeren, H. J. A. Rottgering, D. A. Rafferty +79
Abell 2256 is one of the best known examples of a galaxy cluster hosting large-scale diffuse radio emission that is unrelated to individual galaxies. It contains both a giant radio…
Hide and seek between Andromeda's halo, disk, and giant stream
Gisella Clementini, Rodrigo Contreras Ramos, Luciana Federici +17
Photometry in B, V (down to V ~ 26 mag) is presented for two 23' x 23' fields of the Andromeda galaxy (M31) that were observed with the blue channel camera of the Large Binocular T…
LOFAR and APERTIF surveys of the radio sky: probing shocks and magnetic fields in galaxy clusters
Huub Rottgering, Jose Afonso, Peter Barthel +32
At very low frequencies, the new pan-European radio telescope LOFAR is opening the last unexplored window of the electromagnetic spectrum for astrophysical studies. The revolutiona…
LOFAR: Recent imaging results & future prospects
George Heald, Michael R. Bell, Andreas Horneffer +27
The Low Frequency Array (LOFAR) is under construction in the Netherlands and in several surrounding European countries. In this contribution, we describe the layout and design of t…
LOFAR: Early imaging results from commissioning for Cygnus A
John McKean, Louise Ker, Reinout J. van Weeren +19
The Low Frequency Array (LOFAR) will operate between 10 and 250 MHz, and will observe the low frequency Universe to an unprecedented sensitivity and angular resolution. The constru…
An elusive radio halo in the merging cluster Abell 781?
T. Venturi, S. Giacintucci, D. Dallacasa +4
Deep radio observations of the galaxy cluster Abell 781 have been carried out using the Giant Metrewave Radio Telescope at 325 MHz and have been compared to previous 610 MHz observ…
GMRT 150 MHz follow up of diffuse steep spectrum radio emission in galaxy clusters
G. Macario, T. Venturi, D. Dallacasa +5
It has been recently found that a few galaxy clusters host diffuse radio halo emission with very steep synchrotron spectra ( > 1.6), which may be classified as Ultra Steep Spect…
A shock front in the merging galaxy cluster Abell 754: X-ray and radio observations
Giulia Macario, Maxim Markevitch, Simona Giacintucci +3
We present new Chandra X-ray and Giant Meterwave Radio Telescope (GMRT) radio observations of the nearby merging galaxy cluster Abell 754. Our X-ray data confirm the presence of a…
The very steep spectrum radio halo in Abell 697
Giulia Macario, Tiziana Venturi, Gianfranco Brunetti +5
In this paper we present a detailed study of the giant radio halo in the galaxy cluster Abell 697, with the aim to constrain its origin and connection with the cluster dynamics. We…
Deep 1.4 GHZ Follow Up of the Steep Spectrum Radio Halo in Abell 521
D. Dallacasa, G. Brunetti, S. Giacintucci +6
In a recent paper we reported on the discovery of a radio halo with very steep spectrum in the merging galaxy cluster Abell 521 through observations with the Giant Metrewave Radio…
The GMRT Radio Halo Survey and low frequency follow-up
T. Venturi, S. Giacintucci, R. Cassano +6
The GMRT Radio Halo Survey, carried out at 610 MHz to investigate the statistical properties of cluster radio halos in a complete cluster sample selected in the redshift interval z…