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REVISITING SCALING RELATIONS FOR GIANT RADIO HALOS IN GALAXY CLUSTERS

Many galaxy clusters host megaparsec-scale radio halos, generated by ultrarelativistic electrons in the magnetized intracluster medium. The X-ray luminosity and redshift-limited Extended GMRT Radio Halo Survey provides a rich and unique dataset for statistical studies of the halos. We uniformly anal...

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Published in:	The Astrophysical journal 2013-11, Vol.777 (2), p.1-14
Main Authors:	Cassano, R, Ettori, S, Brunetti, G, Giacintucci, S, Pratt, G W, Venturi, T, Kale, R, Dolag, K, Markevitch, M
Format:	Article
Language:	English
Subjects:	ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Clusters Correlation CORRELATIONS COSMIC ELECTRONS COSMIC RADIO SOURCES Galactic clusters Galactic halos GALAXY CLUSTERS GHZ RANGE Halos KEV RANGE LUMINOSITY Radio RADIOASTRONOMY RED SHIFT RELATIVISTIC RANGE Statistical methods THERMODYNAMIC PROPERTIES X RADIATION X-RAY GALAXIES X-rays
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container_title	The Astrophysical journal
container_volume	777
creator	Cassano, R Ettori, S Brunetti, G Giacintucci, S Pratt, G W Venturi, T Kale, R Dolag, K Markevitch, M
description	Many galaxy clusters host megaparsec-scale radio halos, generated by ultrarelativistic electrons in the magnetized intracluster medium. The X-ray luminosity and redshift-limited Extended GMRT Radio Halo Survey provides a rich and unique dataset for statistical studies of the halos. We uniformly analyze the radio and X-ray data for the GMRT cluster sample, and use the new Planck Sunyaev-Zel'dovich (SZ) catalog to revisit the correlations between the power of radio halos and the thermal properties of galaxy clusters. Our bigger and more homogenous sample confirms that the X-ray luminous (L sub(500) > 5 x 10 super(44) erg s super(-1)) clusters branch into two populations-radio halos lie on the correlation, while clusters without radio halos have their radio upper limits well below that correlation. Bimodality of both correlations can be traced to clusters dynamics, with radio halos found exclusively in merging clusters. These results confirm the key role of mergers for the origin of giant radio halos, suggesting that they trigger the relativistic particle acceleration.
doi_str_mv	10.1088/0004-637X/777/2/141
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subjects	ASTROPHYSICS ASTROPHYSICS, COSMOLOGY AND ASTRONOMY Clusters Correlation CORRELATIONS COSMIC ELECTRONS COSMIC RADIO SOURCES Galactic clusters Galactic halos GALAXY CLUSTERS GHZ RANGE Halos KEV RANGE LUMINOSITY Radio RADIOASTRONOMY RED SHIFT RELATIVISTIC RANGE Statistical methods THERMODYNAMIC PROPERTIES X RADIATION X-RAY GALAXIES X-rays
title	REVISITING SCALING RELATIONS FOR GIANT RADIO HALOS IN GALAXY CLUSTERS
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