A massive cluster at z = 0.288 caught in the process of formation: The case of Abell 959

Bîrzan, L.; Rafferty, D. A.; Cassano, R.; Brunetti, G.; Weeren, R. J. van; Brüggen, M.; Intema, H. T.; Gasperin, F. de; Andrade-Santos, Felipe; Botteon, A.; Röttgering, H. J. A.; Shimwell, T. W.

doi:10.1093/mnras/stz1456

Cited by 23 publications

(19 citation statements)

References 195 publications

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“…Using the measurement in Table 3, we estimate the X-ray luminosity for the cluster system to be L cex = (2.6 +0.4 −0.3 ) × 10 44 erg s −1 . We compare our measurements for the cluster system eFEDS J093513.3+004746 and eFEDS J093510.7+004910 with those for 94 clusters (of which 13 lack a radio halo detection) presented in Bîrzan et al (2019). Figure 10 shows that our measurements slightly deviate from those for the known radio halos and from the best-fit relation that is obtained for 25 clusters in Cassano et al (2013).…”

Section: The Scaling Relation P 14 Ghz -L 500mentioning

confidence: 73%

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

Ghirardini

Bulbul

Hoang

et al. 2021

A&A

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Aims. We examine the X-ray, optical, and radio properties of the member clusters of a new supercluster discovered during the SRG/eROSITA Performance Verification phase. Methods. We analyzed the 140 deg2 eROSITA Final Equatorial Depth Survey (eFEDS) field observed during the Performance Verification phase to a nominal depth of about 2.3 ks. In this field, we detect a previously unknown supercluster consisting of a chain of eight galaxy clusters at z ~ 0.36. The redshifts of these members were determined through Hyper Suprime-Cam photometric measurements. We examined the X-ray morphological and dynamical properties, gas, and total mass out to R500 of the members and compare these with the same properties of the general population of clusters detected in the eFEDS field. We further investigated the gas in the bridge region between the cluster members for a potential WHIM detection. We also used radio follow-up observations with LOFAR and uGMRT to search for diffuse emission and constrain the dynamic state of the system. Results. We do not find significant differences between the morphological parameters and properties of the intra-cluster medium of the clusters embedded in this large-scale filament and those of the eFEDS clusters. We also provide upper limits on the electron number density and mass of the warm-hot intergalactic medium as provided by the eROSITA data. These limits are consistent with previously reported values for the detections in the vicinity of clusters of galaxies. In LOFAR and uGMRT follow-up observations of the northern part of this supercluster, we find two new radio relics and a radio halo that are the result of major merger activity in the system. Conclusions. These early results show the potential of eROSITA to probe large-scale structures such as superclusters and the properties of their members. Our forecasts show that we will be able to detect about 450 superclusters, with approximately 3000 member clusters located in the eROSITA_DE region at the final eROSITA all-sky survey depth, enabling statistical studies of the properties of superclusters and their constituents embedded in the cosmic web.

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Section: The Scaling Relation P 14 Ghz -L 500mentioning

confidence: 73%

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

Ghirardini

Bulbul

Hoang

et al. 2021

A&A

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“…angle (Skillman et al 2013). This has been seen in a few clusters, for example, Abell 959 (Bîrzan et al 2019), Abell 2255 (Akamatsu et al 2016), and MACS J0717.5+3745 (Bonafede et al 2009).…”

Section: Macs J05534-3342mentioning

confidence: 84%

ASKAP reveals giant radio halos in two merging SPT galaxy clusters

Wilber¹,

Johnston‐Hollitt²,

Duchesne³

et al. 2020

Publ. Astron. Soc. Aust.

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Early science observations from the Australian Square Kilometre Array Pathfinder (ASKAP) have revealed clear signals of diffuse radio emission associated with two clusters detected by the South Pole Telescope via their Sunyaev Zel’dovich signal: SPT CLJ0553-3342 (MACS J0553.4-3342) and SPT CLJ0638-5358 (Abell S0592) are both high-mass lensing clusters that have undergone major mergers. To create science-fidelity images of the galaxy clusters, we performed direction-dependent (DD) calibration and imaging on these ASKAP early science observations using state-of-the-art software killMS and DDFacet. Here, we present our DD calibrated ASKAP radio images of both clusters showing unambiguous giant radio halos with largest linear scales of ${\sim}1$ Mpc. The halo in MACS J0553.4-3342 was previously detected with Giant Metrewave Radio Telescope observations at 323 MHz but appears more extended in our ASKAP image. Although there is a shock detected in the thermal X-ray emission of this cluster, we find that the particle number density in the shocked region is too low to allow for the generation of a radio shock. The radio halo in Abell S0592 is a new discovery, and the Southwest border of the halo coincides with a shock detected in X-rays. We discuss the origins of these halos considering both the hadronic and turbulent re-acceleration models and sources of seed electrons. This work gives a positive indication of the potential of ASKAP’s Evolutionary Map of the Universe survey in detecting intracluster medium radio sources.

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“…Most systems were observed as part of LoTSS, the LOFAR Two-meter Sky Survey (Shimwell et al 2019), and for 8 h of total integration time, except for the lower declination systems that were observed for 4 h (see Table 2). 3 The PREFACTOR 4 and FACTOR pipelines 5 were used to calibrate and image the data using the facet-calibration scheme described in van Weeren et al 2016, following the process detailed in Bîrzan et al (2019). Version 2.0.2 of PREFACTOR and version 1.3 of FACTOR were used.…”

Section: Lofar Datamentioning

confidence: 99%

LOFAR observations of X-ray cavity systems

Bîrzan

Rafferty

Brüggen

et al. 2020

Monthly Notices of the Royal Astronomical Society

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ABSTRACT We present LOFAR observations at 120–168 MHz of 42 systems with possible X-ray cavities in their hot atmosphere, of which 17 are groups or ellipticals, 19 are nearby clusters (z < 0.3), and six are higher redshift clusters (z > 0.3). The X-ray cavities, formed by the radio lobes of the central active galactic nucleus (AGN), are evidence of radio-mode AGN feedback. In the groups and ellipticals sample, half of the systems have X-ray cavities for which no associated lobe emission was detected. Conversely, we report the discovery of large radio lobes in NGC 6338, extending far beyond the emission reported previously in the literature. In the case of the nearby clusters, our observations show that there is little low-frequency radio emission that extends beyond the cavities (e.g. MS 0735.6+7421, A2052). For the first time, we report secure cavity-radio associations in 2A 0335+096, ZwCl 2701, and ZwCl 8276 that strengthens their interpretation as AGN-created cavities. However, in some known cavity systems (e.g. A1795 and ZwCl 3146) we report the lack of detectable low-frequency radio emission associated with the cavities. Our sample of higher redshifts systems is small, and unfortunately the present LOFAR observations are not able to resolve the lobes in many of them. Nevertheless, our sample represents one of the best available for investigating the connection between radio and jet power in radio-mode AGN feedback.

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A massive cluster at z = 0.288 caught in the process of formation: The case of Abell 959

Cited by 23 publications

References 195 publications

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

Discovery of a supercluster in the eROSITA Final Equatorial Depth Survey: X-ray properties, radio halo, and double relics

ASKAP reveals giant radio halos in two merging SPT galaxy clusters

LOFAR observations of X-ray cavity systems

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