A radio minihalo in the extreme cool-core galaxy cluster RXC J1504.1–0248

Giacintucci, S.; Markevitch, M.; Brunetti, G.; Cassano, R.; Venturi, T.

doi:10.1051/0004-6361/201015882

Cited by 47 publications

(52 citation statements)

References 25 publications

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“…For example, our expectations based on our hadronic model are in tension with observations of a few of the best-observed minihalos, which show the radio emission confined to roughly the size of the core region in all directions (Mazzotta & Giacintucci 2008;Giacintucci et al 2011Giacintucci et al , 2014a. Similarly, spectral studies of radio minihalos (such as in Murgia et al 2010; indicate that significant spectral steepening is likely to be common in these sources.…”

Section: Discussionmentioning

confidence: 42%

“…These are relatively rare sources, with currently only around 10 clusters with confirmed detections. Examples include Perseus (Burns et al 1992), A2029 (Govoni et al 2009), Ophiuchus (Govoni et al 2009;Murgia et al 2010), RXC J1504.1-0248 (Giacintucci et al 2011), and RXJ 1347-1145(Gitti et al 2007, along with the newest detections in Giacintucci et al (2014a). The origin of radio mini-halos in cool core clusters, as well as their possible connection with giant radio halos, is still unclear (see, e.g., Brunetti & Jones 2014, for a review).…”

Section: Introductionmentioning

confidence: 99%

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Testing Secondary Models for the Origin of Radio Mini-Halos in Galaxy Clusters

ZuHone

Brunetti

Giacintucci

et al. 2015

ApJ

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We present an MHD simulation of the emergence of a radio minihalo in a galaxy cluster core in a "secondary" model, where the source of the synchrotron-emitting electrons is hadronic interactions between cosmic-ray protons with the thermal intracluster gas, an alternative to the "reacceleration model" where the cosmic ray electrons are reaccelerated by turbulence induced by core sloshing, which we discussed in an earlier work. We follow the evolution of cosmic-ray electron spectra and their radio emission using passive tracer particles, taking into account the time-dependent injection of electrons from hadronic interactions and their energy losses. We find that secondary electrons in a sloshing cluster core can generate diffuse synchrotron emission with luminosity and extent similar to observed radio minihalos. However, we also find important differences with our previous work. We find that the drop in radio emission at cold fronts is less prominent than that in our reacceleration-based simulations, indicating that in this flavor of the secondary model the emission is more spatially extended than in some observed minihalos. We also explore the effect of rapid changes in the magnetic field on the radio spectrum. While the resulting spectra in some regions are steeper than expected from stationary conditions, the change is marginal, with differences in the synchrotron spectral index of  a D 0.15-0.25, depending on the frequency band. This is a much narrower range than claimed in the best-observed minihalos and produced in the reacceleration model. Our results provide important suggestions to constrain these models with future observations.

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Section: Discussionmentioning

confidence: 42%

Section: Introductionmentioning

confidence: 99%

Testing Secondary Models for the Origin of Radio Mini-Halos in Galaxy Clusters

ZuHone

Brunetti

Giacintucci

et al. 2015

ApJ

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“…(1) Venturi et al (2007); (2) Venturi et al (2008); (3) Giovannini & Feretti (2000); (4) Bonafede et al (2009); (5) Govoni et al (2009); (6) Kale et al (2013); (7) Kale et al (2015); (8) van Weeren et al (2011); (9) Giacintucci et al (2014b); (10) van Weeren et al (2013); (11) Brunetti et al (2008); (12) Bacchi et al (2003); (13) Giacintucci et al (2011a); (14) Govoni et al (2001); (15) Giacintucci et al (2014a); (16) Giacintucci et al (2009); (17) Giovannini et al (2006); (18) Giacintucci et al (2011b); (19) Murgia et al (2009); (20) Vacca et al (2011); (21) Venturi et al 2013;(22) Giacintucci et al (2013); (23) Feretti et al (2001); (24) …”

Section: The Low-z Sample and The Nvss Data Analysisunclassified

Occurrence of radio halos in galaxy clusters

Cuciti

Cassano

Brunetti

et al. 2015

A&A

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Context. Giant radio halos (RH) are diffuse Mpc-scale synchrotron sources detected in some massive and merging galaxy clusters. An unbiased study of the statistical properties of RHs is crucial to constraining their origin and evolution. Aims. We investigate the occurrence of RHs and its dependence on the cluster mass in a Sunyaev-Zel'dovich (SZ)-selected sample of galaxy clusters, which is nearly a mass-selected sample. Moreover, we analyse the connection between RHs and merging clusters. Methods. We selected from the Planck SZ catalogue clusters with M ≥ 6 × 10 14 M at z = 0.08−0.33 and we searched for the presence of RHs using the NVSS for z < 0.2 and the GMRT RH survey (GRHS) and its extension (EGRHS) for 0.2 < z < 0.33. We used archival Chandra X-ray data to derive information on the dynamical status of the clusters. Results. We confirm that RH clusters are merging systems while the majority of clusters without RH are relaxed, thus supporting the idea that mergers play a fundamental role in the generation of RHs. We find evidence for an increase in the fraction of clusters with RHs with the cluster mass and this is in line with expectations derived on the basis of the turbulence re-acceleration scenario. Finally, we discuss the effect of the incompleteness of our sample on this result.

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“…The cluster A2667 was excluded due to the presence of a radio galaxy near its centre. The newly obtained upper limits and the known minihalos, namely, RXC J1504.1-0248 (Giacintucci et al 2011), A1835 ) , Z7160 (V08), RX J1532.9+3021, and A2390 (Bacchi et al 2003) from the GRHS sample and Ophiucus, A2029 ), Perseus (Sijbring 1993), RXC J1347.5-1145 (Gitti et al 2007) and RBS797 (Gitti et al 2006) from the literature are plotted in the P 1.4 GHz −L X plane (Fig. 7, left).…”

Section: Mini-halosmentioning

confidence: 99%

“…Mini-halos have been found in relaxed, cool core clusters (e.g. Gitti et al 2002;Govoni et al 2009;Giacintucci et al 2011). Re-acceleration of a pre-existing population of relativistic electrons in cool cores by turbulence has been proposed to explain the mini-halos (Gitti et al 2002;Mazzotta & Giacintucci 2008;ZuHone et al 2013).…”

Section: Introductionmentioning

confidence: 99%

The Extended GMRT Radio Halo Survey

Kale

Venturi

Giacintucci

et al. 2013

A&A

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122

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Context. A fraction of galaxy clusters host diffuse radio sources called radio halos, radio relics and mini-halos. These are associated with the relativistic electrons and magnetic fields present on ∼Mpc scales in the intra-cluster medium. Aims. We aim to carry out a systematic radio survey of all luminous galaxy clusters selected from the REFLEX and eBCS X-ray catalogues with the Giant Metrewave Radio Telescope, to understand the statistical properties of the diffuse radio emission in galaxy clusters. Methods. We present the sample and first results from the Extended GMRT Radio Halo Survey (EGRHS), which is an extension of the GMRT Radio Halo Survey (GRHS, Venturi et al. 2007. Analysis of radio data at 610/ 235/ 325 MHz on 12 galaxy clusters are presented. Results. We report the detection of a newly discovered mini-halo in the cluster RX J1532.9+3021 at 610 MHz. The presence of a small-scale relic (∼200 kpc) is suspected in the cluster Z348. We do not detect cluster-scale diffuse emission in 11 clusters. Robust upper limits on the detection of radio halo of size of 1 Mpc are determined. We also present upper limits on the detections of minihalos in a sub-sample of cool-core clusters. The upper limits for radio halos and mini-halos are plotted in the radio power-X-ray luminosity plane and the correlations are discussed. Diffuse extended emission that is not related to the target clusters, but detected as by-products in the sensitive images of two of the cluster fields (A689 and RX J0439.0+0715) is also reported. Conclusions. Based on the information about the presence of radio halos (or upper limits), available on 48 clusters out of the total sample of 67 clusters (EGRHS+GRHS), we find that 23±7% of the clusters host radio halos. The radio halo fraction rises to 31±11%, when only the clusters with X-ray luminosities >8 × 10 44 erg s −1 are considered. Mini-halos are found in ∼50% of cool-core clusters. A qualitative examination of the X-ray images of the clusters with no diffuse radio emission indicates that a majority of these clusters do not show extreme dynamical disturbances and supports the idea that mergers play an important role in generating radio halos and relics. The analysis of the full sample will be presented in a future work.

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A radio minihalo in the extreme cool-core galaxy cluster RXC J1504.1–0248

Cited by 47 publications

References 25 publications

Testing Secondary Models for the Origin of Radio Mini-Halos in Galaxy Clusters

Testing Secondary Models for the Origin of Radio Mini-Halos in Galaxy Clusters

Occurrence of radio halos in galaxy clusters

The Extended GMRT Radio Halo Survey

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