The Scaling Relations and the Fundamental Plane for Radio Halos and Relics of Galaxy Clusters

Yuan, Z. S.; Han, J. L.; Wen, Z. L.

doi:10.1088/0004-637x/813/1/77

Cited by 54 publications

(82 citation statements)

References 110 publications

(90 reference statements)

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“…It has been found that the radio power of halos correlate with the X-ray luminosity of the host cluster (Brunetti et al 2007Cassano et al 2013;Yuan et al 2015). In Fig.…”

Section: Halo Spectral Index Estimatementioning

confidence: 88%

LOFAR discovery of an ultra-steep radio halo and giant head–tail radio galaxy in Abell 1132

Wilber

Brüggen

Bonafede

et al. 2017

Monthly Notices of the Royal Astronomical Society

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LOFAR observations at 144 MHz have revealed large-scale radio sources in the unrelaxed galaxy cluster Abell 1132. The cluster hosts diffuse radio emission on scales of ∼ 650 kpc near the cluster center and a head-tail (HT) radio galaxy, extending up to 1 Mpc, south of the cluster center. The central diffuse radio emission is not seen in NVSS, FIRST, WENSS, nor in C & D array VLA observations at 1.4 GHz, but is detected in our follow-up GMRT observations at 325 MHz. Using LOFAR and GMRT data, we determine the spectral index of the central diffuse emission to be α = −1.75 ± 0.19 (S ∝ ν α ). We classify this emission as an ultra-steep spectrum radio halo and discuss the possible implications for the physical origin of radio halos. The HT radio galaxy shows narrow, collimated emission extending up to 1 Mpc and another 300 kpc of more diffuse, disturbed emission, giving a full projected linear size of 1.3 Mpc -classifying it as a giant radio galaxy (GRG) and making it the longest HT found to date. The head of the GRG coincides with an elliptical galaxy (SDSS J105851.01+564308.5) belonging to Abell 1132. In our LOFAR image, there appears to be a connection between the radio halo and the GRG. The turbulence that may have produced the halo may have also affected the tail of the GRG. In turn, the GRG may have provided seed electrons for the radio halo.

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“…It has been found that the radio power of halos correlate with the X-ray luminosity of the host cluster (Brunetti et al 2007Cassano et al 2013;Yuan et al 2015). In Fig.…”

Section: Halo Spectral Index Estimatementioning

confidence: 88%

LOFAR discovery of an ultra-steep radio halo and giant head–tail radio galaxy in Abell 1132

Wilber

Brüggen

Bonafede

et al. 2017

Monthly Notices of the Royal Astronomical Society

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“…For several relics, the jump in X-ray surface brightness and/or temperature maps has been clearly measured (e.g., Sarazin et al 2014;Akamatsu et al 2015;Botteon et al 2016;van Weeren et al 2016). In addition to the shocks found in several clusters, the disturbance of the cluster X-ray surface brightness, as measured by power ratios, centroid shifts and concentration parameters, shows that relics are, in general, related to ongoing mergers (Yuan et al 2015).…”

Section: Introductionmentioning

confidence: 95%

Can cluster merger shocks reproduce the luminosity and shape distribution of radio relics?

Nuza

Gelszinnis

Hoeft

et al. 2017

Monthly Notices of the Royal Astronomical Society

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Radio relics in galaxy clusters are believed to trace merger shock fronts. If cosmological structure formation determines the luminosity, size and shape distributions of radio relics then merger shocks need to be lighted up in a homogeneous way. We investigate if a mock relic sample, obtained from zoomed galaxy cluster simulations, is able to match the properties of relics measured in the NRAO VLA Sky Survey (NVSS). We compile a list of all radio relics known to date and homogeneously measure their parameters in all NVSS images and apply the same procedure to relics in our simulations. Number counts in the mock relic sample increase more steeply towards lower relic flux densities, suggesting an incompleteness of NVSS in this regime. Overall, we find that NVSS and mock samples show similar properties. However, large simulated relics tend to be somewhat smaller and closer to the cluster centre than observed ones. Besides this, the mock sample reproduces very well-known correlations for radio relics, in particular those relating the radio luminosity with the largest linear size and the Xray luminosity. We show that these correlations are largely governed by the sensitivity of the NVSS observations. Mock relics show a similar orientation with respect to the direction to the cluster centre as the NVSS sample. Moreover, we find that their maximum radio luminosity roughly correlates with cluster mass, although displaying a large scatter. The overall good agreement between NVSS and the mock sample suggests that properties of radio relics are indeed governed by merger shock fronts, emitting in a homogeneous fashion. Our study demonstrates that the combination of mock observations and data from upcoming radio surveys will allow to shed light on both the origin of radio relics and the nature of the intracluster medium.

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“…The MeerKLASS survey is expected to detect a radio halo and/or relic in approximately 200 clusters, lower in mass and over a broad range of redshift, greatly extending the current number of ∼ 65 sources [25]. This statistically significant sample of diffuse emission is crucial for advancing the understanding of its formation and evolution.…”

Section: Diffuse Cluster Emissionmentioning

confidence: 99%

A Large Sky Survey with MeerKAT

Santos¹,

Bull²,

Camera³

et al. 2018

Proceedings of MeerKAT Science: On the Pathway to the SKA — PoS(MeerKAT2016)

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We discuss the ground-breaking science that will be possible with a wide area survey, using the MeerKAT telescope, known as MeerKLASS (MeerKAT Large Area Synoptic Survey). The current specifications of MeerKAT make it a great fit for cosmological applications, which require large volumes. In particular, a large survey over ∼ 4, 000 deg 2 for ∼ 4, 000 hours will potentially provide the first ever measurements of the baryon acoustic oscillations using the 21cm intensity mapping technique, with enough accuracy to impose constraints on the nature of dark energy. The combination with multi-wavelength data will give unique additional information, such as the first constraints on primordial non-Gaussianity using the multi-tracer technique, as well as a better handle on foregrounds and systematics. The survey will also produce a large continuum galaxy sample down to a depth of 5 µJy in L-band, unmatched by any other concurrent telescope, which will allow to study the large-scale structure of the Universe out to high redshifts. Finally, the same survey will supply unique information for a range of other science applications, including a large statistical investigation of galaxy clusters, and the discovery of rare high-redshift AGN that can be used to probe the epoch of reionization as well as produce a rotation measure map across a huge swathe of the sky. The MeerKLASS survey will be a crucial step on the road to using SKA1-MID for cosmological applications, as described in the top priority SKA key science projects.

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The Scaling Relations and the Fundamental Plane for Radio Halos and Relics of Galaxy Clusters

Cited by 54 publications

References 110 publications

LOFAR discovery of an ultra-steep radio halo and giant head–tail radio galaxy in Abell 1132

LOFAR discovery of an ultra-steep radio halo and giant head–tail radio galaxy in Abell 1132

Can cluster merger shocks reproduce the luminosity and shape distribution of radio relics?

A Large Sky Survey with MeerKAT

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