Occurrence of radio halos in galaxy clusters

Cuciti, V.; Cassano, R.; Brunetti, G.; Dallacasa, D.; Kale, Ruta; Ettori, S.; Venturi, T.

doi:10.1051/0004-6361/201526420

Cited by 110 publications

(149 citation statements)

References 64 publications

Supporting

Mentioning

141

Contrasting

Unclassified

Order By: Relevance

“…Sommer & Basu (2014) found that the selection of galaxy clusters from X-ray surveys biases against disturbed systems, thereby underestimating the fraction of radio halo clusters. Cuciti et al (2015) found a large fraction of radio halos in high-mass clusters, where most of them conform to the criteria of merging systems, following the morphological classification discussed in Cassano et al (2010).…”

Section: Introductionmentioning

confidence: 69%

Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies

Sommer

Basu

Intema

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

Radio halos are diffuse synchrotron sources on scales of ∼1 Mpc that are found in merging clusters of galaxies, and are believed to be powered by electrons re-accelerated by the merger-driven turbulence. We present measurements of extended radio emission on similarly large scales in two clusters of galaxies hosting cool cores: Abell 2390 and Abell 2261. The analysis is based on interferometric imaging with the JVLA, VLA and GMRT. We present detailed radio images of the targets, subtract the compact emission components, and measure the spectral indices for the diffuse components. The radio emission in A2390 extends beyond a known sloshing-like brightness discontinuity, and has a very steep in-band spectral slope at 1.5 GHz that is similar to some known ultra-steep spectrum radio halos. The diffuse signal in A2261 is more extended than in A2390 but has lower luminosity. X-ray morphological indicators, derived from XMMNewton X-ray data, place these clusters in the category of relaxed or regular systems, although some asymmetric features that can indicate past minor mergers are seen in the X-ray brightness images. If these two Mpc-scale radio sources are categorized as giant radio halos, they question the common assumption of radio halos occurring exclusively in clusters undergoing violent merging activity, in addition to commonly used criteria in distinguishing between radio halos and mini-halos.

show abstract

Section: Introductionmentioning

confidence: 69%

Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies

Sommer

Basu

Intema

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

show abstract

“…First results, based on a sub-sample of 57 clusters with available radio information, have been published in Cuciti et al (2015). We are completing the analysis of the sample using new GMRT and JVLA data of all the clusters that lack deep radio observations in order to determine the possible presence of diffuse emission.…”

Section: Introductionmentioning

confidence: 99%

New giant radio sources and underluminous radio halos in two galaxy clusters

Cuciti

Brunetti

Weeren

et al. 2018

A&A

Self Cite

View full text Add to dashboard Cite

Aims. The aim of this work is to analyse the radio properties of the massive and dynamical disturbed clusters Abell 1451 and Zwcl 0634.1+4750, especially focusing on the possible presence of diffuse emission. Methods. We present new GMRT 320 MHz and JVLA 1.5 GHz observations of these two clusters. Results. We found that both Abell 1451 and Zwcl 0634.1+4750 host a radio halo with a typical spectrum (α ∼ 1 − 1.3). Similarly to a few other cases reported in the recent literature, these radio halos are significantly fainter in radio luminosity with respect to the current radio power-mass correlations and they are smaller than classical giant radio halos. These underluminous sources might contribute to shed light on the complex mechanisms of formation and evolution of radio halos. Furthermore, we detected a candidate radio relic at large distance from the cluster center in Abell 1451 and a peculiar head tail radio galaxy in Zwcl 0634.1+4750, which might be interacting with a shock front.

show abstract

“…ZwCl 2701 is a known relaxed galaxy cluster (Cuciti et al 2015;Kale et al 2015) positioned at RA = 09:52:49.20, DEC = +51:53:05.19 and located at a redshift of 0.214. The presence of X-ray cavities in this system have been reported by Rafferty et al (2006) in a broad study of a sample of 31 groups and cluster galaxies.…”

Section: Introductionmentioning

confidence: 99%

AGN-driven perturbations in the intracluster medium of the cool-core cluster ZwCl 2701

Vagshette¹,

Sonkamble²,

Naik³

et al. 2016

Mon. Not. R. Astron. Soc.

View full text Add to dashboard Cite

We present the results obtained from a total of 123 ks X-ray (Chandra) and 8 hrs of 1.4 GHz radio (Giant Metrewave Radio Telescope -GMRT) observations of the cool core cluster ZwCl 2701 (z = 0.214). These observations of ZwCl 2701 showed the presence of an extensive pair of ellipsoidal cavities along the East and West directions within the central region < 20 kpc. Detection of bright rims around the cavities suggested that the radio lobes displaced Xray emitting hot gas forming shell-like structures. The total cavity power (mechanical power) that directly heated the surrounding gas and cooling luminosity of the cluster were estimated to be ∼ 2.27 × 10 45 erg s −1 and 3.5× 10 44 erg s −1 , respectively. Comparable values of cavity power and cooling luminosity of ZwCL 2701 suggested that the mechanical power of the AGN outburst is large enough to balance the radiative cooling in the system. The star formation rate derived from the Hα luminosity was found to be ∼ 0.60 M yr −1 which is about three orders of magnitude lower than the cooling rate of ∼ 196 M yr −1 . Detection of the floor in entropy profile of ZwCl 2701 suggested the presence of an alternative heating mechanism at the centre of the cluster. Lower value of the ratio (∼10 −2 ) between black hole mass accretion rate and Eddington mass accretion rate suggested that launching of jet from the super massive black hole is efficient in ZwCl 2701. However, higher value of ratio (∼10 3 ) between black hole mass accretion rate and Bondi accretion rate indicated that the accretion rate required to create cavities is well above the Bondi accretion rate.

show abstract

Occurrence of radio halos in galaxy clusters

Cited by 110 publications

References 64 publications

Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies

Mpc-scale diffuse radio emission in two massive cool-core clusters of galaxies

New giant radio sources and underluminous radio halos in two galaxy clusters

AGN-driven perturbations in the intracluster medium of the cool-core cluster ZwCl 2701

Contact Info

Product

Resources

About