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EnglishRadio observations over the last two decades have provided evidence that diffuse synchrotron emission in the form of megaparsec-scale radio halos in galaxy clusters is likely tracing regions of the intracluster medium where relativistic particles are accelerated during cluster mergers. In this paper we present results of a survey of 14 galaxy clusters carried out with the 7-element Karoo Array Telescope at 1.86 GHz, aimed to extend the current studies of radio halo occurrence to systems with lower masses (M$_\rm 500 > 4\times10^14$ M$_\odot$). We found upper limits at the $0.6 - 1.9 \times 10^24$ Watt Hz$^-1$ level for $\sim 50\%$ of the sample, confirming that bright radio halos in less massive galaxy clusters are statistically rare.
| Titolo: | A KAT-7 view of a low-mass sample of galaxy clusters |
| Autore/i: | Bernardi, G.; Venturi, T.; Cassano, R.; DALLACASA, DANIELE; Brunetti, G.; CUCITI, VIRGINIA; Johnston Hollitt, M.; Oozeer, N.; Smirnov, O. M. |
| Autore/i Unibo: | |
| Anno: | 2016 |
| Rivista: | |
| Titolo del libro: | The many facets of extragalactic radio surveys: towards new scientific challenges |
| Pagina iniziale: | 1 |
| Pagina finale: | 7 |
| Abstract: | Radio observations over the last two decades have provided evidence that diffuse synchrotron emission in the form of megaparsec-scale radio halos in galaxy clusters is likely tracing regions of the intracluster medium where relativistic particles are accelerated during cluster mergers. In this paper we present results of a survey of 14 galaxy clusters carried out with the 7-element Karoo Array Telescope at 1.86 GHz, aimed to extend the current studies of radio halo occurrence to systems with lower masses (M$_\rm 500 > 4\times10^14$ M$_\odot$). We found upper limits at the $0.6 - 1.9 \times 10^24$ Watt Hz$^-1$ level for $\sim 50\%$ of the sample, confirming that bright radio halos in less massive galaxy clusters are statistically rare. |
| Data stato definitivo: | 23-giu-2016 |
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