GMRT radio halo survey in galaxy clusters at z = 0.2–0.4 - II. The eBCS clusters and analysis of the complete sample

By T. Venturi, S. Giacintucci, D. Dallacasa, R. Cassano, Gianfranco Brunetti, Sandro Bardelli, G. Setti. 2008

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Aims. We present the results of the GMRT cluster radio halo survey. The main purposes of our observational project are to measure which fraction of massive galaxy clusters in the redshift range z=0.2–0.4 hosts a radio halo, and to constrain the expectations of the particle re–acceleration model for the origin of the non–thermal radio emission. Methods. We selected a complete sample of 50 clusters in the X–ray band from the REFLEX (27) and the eBCS (23) catalogues. In this paper we present Giant Metrewave Radio Telescope (GMRT) observations at 610 MHz for all clusters still lacking high sensitivity radio information, i.e. 16 eBCS and 7 REFLEX clusters, thus completing the radio information for the whole sample. The typical sensitivity in our images is in the range 1� � 35 100 µJy b −1 . Results. We found a radio halo in A697, a diffuse peripheral source of unclear nature in A781, a core–halo source in Z7160, a candidate radio halo in A1682 and “suspect” central emission in Z2661. Including the literature information, a total of 10 clusters in the sample host a radio halo. A very important result of our work is that 25 out of the 34 clusters observed with the GMRT do not host extended central emission at the sensitivity level of our observations, and for 20 of them firm upper limits to the radio power of a giant radio halo were derived. The GMRT Radio Halo Survey shows that radio halos are not common, and our findings on the fraction of giant radio halos in massive clusters are consistent with the statistical expectations based on the re–acceleration model. Our results favour primary to secondary electron models.

Subfields: Astronomy and Astrophysics, Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/f16714f433065ef0638c483c41b7e5b8db96cca5

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Citations in the corpus

ON THE CONNECTION BETWEEN GIANT RADIO HALOS AND CLUSTER MERGERS (2010, methodology): “…evidence in the literature that RHs are found in clusters with significant substructure in the X-ray images, as well as complex gas temperature distribution, which are signatures of cluster mergers (e.g., Schuecker et al. 2001; Govoni et a. 2004; Markevitch & Vikhlinin 2001; Venturi et al. 2008).”
Formation of Galaxy Clusters (2012, background): “…by radio observations of the radio halos: diffuse and faint radio sources filling the central Mpc3 region of many galaxy clusters (e.g., Giovannini et al. 2009, Venturi et al. 2008) arising due to the synchrotron emission of highly relativistic electrons movingi the ICM magnetic fields.”
X-ray–optical classification of cluster mergers and the evolution of the cluster merger fraction (2011, background): “Although our classification of this system as a merger is seemingly called into question by the absence of diffuse radio emission (Venturi et al. 2008), the strong correlation between mergers and non-thermal radio emission is not without exceptions, as demonstrated by Russell et al. (2011) whose…”
The Coma cluster magnetic field from Faraday rotation measures (2009, background): “This is directly demonstrated by the detection of large, diffuse synchrotron radio sources such as radio halos and radio relics, in an increasing number of galaxy clusters (see e. g. Venturi et al. 2008, Giovannini et al. 2009).”
Massive and refined - II. The statistical properties of turbulent motions in massive galaxy clusters with high spatial resolution (2010, background): “…extensive radio follow ups of complete samples of galaxy clusters indicate that a ∼ 1 / 3 of massive L X > 5 10 44 erg / s ( M > 10 15 M ⊙ ) objects host Mpc-scale halos (e.g. Venturi et al.2007; 08; Cassano et al.2008) and that all radio halo clusters are merging systems (e.g. Cassano et al.2010).”
Cosmic ray transport in galaxy clusters: implications for radio halos, gamma-ray signatures, and cool core heating (2010, background): “11 Buote (2001); Schuecker et al. (2001); Markevitch & Vikhlinin (2001); Govoni et al. (2004); Venturi et al. (2008); Cassano et al. (2010). clusters, as the re-accelerated CRe could be injected by hadronic CRp-gas interactions (Brunetti & Blasi 2005).”
LoCuSS: Subaru Weak Lensing Study of 30 Galaxy Clusters (2009, unknown): “…have been found to date: A 209 (Giovannini et al. 2006), A 697 (Kempner & Sarazin 2001), RX J1720 (Mazzotta & Giacintucci 2008), ZwCl 1454 (Venturi et al. 2008), A 115 (Giovannini et al. 1999), A 2345 (Giovannini et al. 1999), A 521 (Ferrari et al. 2003), and A 2219 (Kempner & Sarazin…”
The LOFAR Two-metre Sky Survey. I. Survey description and preliminary data release (2016, background): “The galaxy cluster Abell 1682 has been well studied at radio frequencies from 150 MHz to 1.4 GHz by Venturi et al. (2008), Ven-turi, Giacintucci, & Dallacasa (2011), Venturi et al. (2013) and Macario et al. (2013).”
Acceleration of primary and secondary particles in galaxy clusters by compressible MHD turbulence: from radio haloes to gamma-rays (2010, background): “The recent radio follow up of a complete X–ray sample of galaxy clusters, the ”GMRT Radio Halo Survey” (Venturi et al. 2007, 2008), leads to the discovery of a bi-modal behaviour of the clusters radio properties (Brunetti et al 2007, 2009b): radio halos are found in the most disturbed systems and…”
Diffuse Radio Emission from Galaxy Clusters (2019, methodology): “8+1707r 0.383 cH Venturi et al. (2008, 2013) MACS J0949.”