Fully stripped? The dynamics of dark and luminous matter in the massive cluster collision MACSJ0553.4−3342

Ebeling, H.; Qi, Jia; Richard, Johan

doi:10.1093/mnras/stx1636

Cited by 21 publications

(24 citation statements)

References 54 publications

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“…This is confirmed by the SB profile fit (Fig. 7g) that leads to a compression factor of C = 2.49 +0.32 −0.26 , while the temperature jump found by spectral analysis of R = 0.62 +0.33 −0.18 indicates that this discontinuity is a cold front (see also Ebeling, Qi & Richard 2017;Pandge et al 2017). The high value of kTu = 13.7 +6.9 −3.7 keV suggests a shock-heated region to the E of the cold front; indeed the "outer" SB profile of Fig.…”

Section: Detectionssupporting

confidence: 66%

“…A radio halo that follows the ICM emission has been detected in this system . At the time of this writing, two more papers on MACS J0553.4-3342, both containing a joint analysis of Hubble Space Telescope and Chandra observations, were published (Ebeling, Qi & Richard 2017;Pandge et al 2017). The maps of the ICM thermodynamical quantities shown in Fig.…”

Section: Detectionsmentioning

confidence: 99%

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Shocks and cold fronts in merging and massive galaxy clusters: new detections with Chandra

Botteon

Gastaldello

Brunetti

2018

Monthly Notices of the Royal Astronomical Society

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A number of merging galaxy clusters shows the presence of shocks and cold fronts, i.e. sharp discontinuities in surface brightness and temperature. The observation of these features requires an X-ray telescope with high spatial resolution like Chandra, and allows to study important aspects concerning the physics of the intra-cluster medium (ICM), such as its thermal conduction and viscosity, as well as to provide information on the physical conditions leading to the acceleration of cosmic rays and magnetic field amplification in the cluster environment. In this work we search for new discontinuities in 15 merging and massive clusters observed with Chandra by using different imaging and spectral techniques of X-ray observations. Our analysis led to the discovery of 22 edges: six shocks, eight cold fronts and eight with uncertain origin. All the six shocks detected have M < 2 derived from density and temperature jumps. This work contributed to increase the number of discontinuities detected in clusters and shows the potential of combining diverse approaches aimed to identify edges in the ICM. A radio follow-up of the shocks discovered in this paper will be useful to study the connection between weak shocks and radio relics.

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Section: Detectionssupporting

confidence: 66%

Section: Detectionsmentioning

confidence: 99%

Shocks and cold fronts in merging and massive galaxy clusters: new detections with Chandra

Botteon

Gastaldello

Brunetti

2018

Monthly Notices of the Royal Astronomical Society

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“…While two other clusters in their sample showed clear double radio relics, there were no such radio shock structures observed in MACSJ0553. They elaborated upon the unexpected absence of radio relics in this cluster, predicting that the merger axis may not be in the plane of the sky (which was later confirmed by Ebeling et al 2017) and therefore it may be difficult to see radio shocks due to the combination of projection effects and the brightness of the halo.…”

Section: Macs J05534-3342mentioning

confidence: 90%

“…They calculated the shock Mach number to be . Both Pandge et al (2017) and Ebeling et al (2017) confirmed the presence of this cold front and shock and used HST data to surmise that there are two subclusters of galaxies that make up this system, SC1 and SC2, which are separated by a projected distance of 650 kpc. More recently, Botteon et al (2018) used an edge detection filter and spectral analysis to search for shocks and cold fronts in a sample of 15 mass-selected clusters, including MACSJ0553, and they found that the cluster additionally hosts another cold front on the opposite, Western side of its ICM.…”

Section: Introductionmentioning

confidence: 90%

“…They also assessed that the merger evolutionary stage is likely after core passage. A further, more detailed study of this system was published in Ebeling, Qi, & Richard (2017) where the dynamics of dark and luminous matter were considered. There they combined HST and Chandra data and found that the merger axis is actually not in the plane of the sky but at a large inclination angle, and that the less massive Western component was fully stripped by ram-pressure as it passed through the more massive Eastern subcluster.…”

Section: Macs J05534-3342mentioning

confidence: 99%

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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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The SRG/eROSITA All-Sky Survey

Kluge,

Comparat,

Liu

et al. 2024

A&A

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The first SRG/ All-Sky Survey ( provides the largest intracluster medium-selected galaxy cluster and group catalog covering the western Galactic hemisphere. Compared to samples selected purely on X-ray extent, the sample purity can be enhanced by identifying cluster candidates using optical and near-infrared data from the DESI Legacy Imaging Surveys. Using the red-sequence-based cluster finder we measured individual photometric properties (redshift $z_ richness lambda , optical center, and BCG position) for 12\,000 clusters over a sky area of 13\,116\,deg$^2$, augmented by 247 cases identified by matching the candidates with known clusters from the literature. The median redshift of the identified sample is $z=0.31$, with 10<!PCT!> of the clusters at $z>0.72$. The photometric redshifts have an accuracy of $ z/(1+z) for $0.05<z<0.9$. Spectroscopic cluster properties (redshift spec $ and velocity dispersion sigma ) were measured a posteriori for a subsample of 3210 and 1499 clusters, respectively, using an extensive compilation of spectroscopic redshifts of galaxies from the literature. We infer that the primary sample has a purity of 86<!PCT!> and optical completeness >95<!PCT!> for $z>0.05$. For these and further quality assessments of the identified catalog, we applied our identification method to a collection of galaxy cluster catalogs in the literature, as well as blindly on the full Legacy Surveys covering 24\,069\,deg$^2$. Using a combination of these cluster samples, we investigated the velocity dispersion-richness relation, finding that it scales with richness as $ norm with an intrinsic scatter of $ in The primary product of our work is the identified cluster catalog with high purity and a well-defined X-ray selection process, opening the path for precise cosmological analyses presented in companion papers.

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Fully stripped? The dynamics of dark and luminous matter in the massive cluster collision MACSJ0553.4−3342

Cited by 21 publications

References 54 publications

Shocks and cold fronts in merging and massive galaxy clusters: new detections with Chandra

Shocks and cold fronts in merging and massive galaxy clusters: new detections with Chandra

ASKAP reveals giant radio halos in two merging SPT galaxy clusters

The SRG/eROSITA All-Sky Survey

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