The merging galaxy cluster A520 --- a broken-up cool core, a dark subcluster, and an X-ray channel

@article{Wang2016TheMG,
  title={The merging galaxy cluster A520 --- a broken-up cool core, a dark subcluster, and an X-ray channel},
  author={Q. Wang and M. Markevitch and S. Giacintucci},
  journal={arXiv: Cosmology and Nongalactic Astrophysics},
  year={2016}
}
We present results from a deep Chandra X-ray observation of a merging galaxy cluster A520. A high-resolution gas temperature map, after the subtraction of the cluster-scale emission, reveals a long trail of dense, cool clumps --- apparently the fragments of a cool core that has been completely stripped from the infalling subcluster by ram pressure. In this scenario, we can assume that the clumps are still connected by the magnetic field lines. The observed temperature variations imply that… Expand

Figures and Tables from this paper

A massive cluster at z = 0.288 caught in the process of formation: The case of Abell 959
The largest galaxy clusters are observed still to be forming through major cluster-cluster mergers, often showing observational signatures such as radio relics and giant radio haloes. Using LOFARExpand
Fully stripped? The dynamics of dark and luminous matter in the massive cluster collision MACSJ0553.4-3342
We present the results of a multiwavelength investigation of the very X-ray luminous galaxy cluster MACSJ0553.4-3342 ($z = 0.4270$; hereafter MACSJ0553). Combining high-resolution data obtained withExpand
Sparse reconstruction of the merging A520 cluster system
Merging galaxy clusters present a unique opportunity to study the properties of dark matter in an astrophysical context. These are rare and extreme cosmic events in which the bulk of the baryonicExpand
Shocks and cold fronts in merging and massive galaxy clusters: new detections with Chandra
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-rayExpand
The role of dark matter annihilation in the radio emission of the galaxy cluster A520
A520 is a hot and luminous galaxy cluster, where gravitational lensing and X-ray measures reveal a different spatial distribution of baryonic and Dark Matter. This cluster hosts a radio halo, whoseExpand
A Deep X-Ray Look At Abell 2142 --- Viscosity Constraints From Kelvin-Helmholtz Eddies, A Displaced Cool Peak That Makes A Warm Core, And A Possible Plasma Depletion Layer
We analyzed 200 ks of Chandra ACIS observations of the merging galaxy cluster A2142 to examine its prominent cold fronts in detail. We find that the southern cold front exhibits well-developedExpand
The Recent Growth History of the Fornax Cluster Derived from Simultaneous Sloshing and Gas Stripping: Simulating the Infall of NGC 1404
We derive the recent growth history of the Fornax Cluster, in particular the recent infall of the giant elliptical galaxy NGC 1404. We show, using a simple cluster minor merger simulation tailored toExpand
Radio observations of the merging galaxy cluster Abell 520
We examine the possible acceleration mechanisms of the relativistic particles responsible for the extended radio emission in Abell 520. We used new LOFAR 145 MHz, archival GMRT 323 MHz and VLA 1.5Expand
Galaxy evolution in merging clusters: The passive core of the “Train Wreck” cluster of galaxies, A 520⋆
Aims. The mergers of galaxy clusters are the most energetic events in the Universe after the Big Bang. With the increased availability of multi-object spectroscopy and X-ray data, an ever increasingExpand
Discovery of a giant radio fossil in the Ophiuchus galaxy cluster
The Ophiuchus galaxy cluster exhibits a curious concave gas density discontinuity at the edge of its cool core. It was discovered in the Chandra X-ray image by Werner and collaborators, whoExpand
...
1
2
3
...

References

SHOWING 1-10 OF 48 REFERENCES
Chandra Observation of the Merging Cluster A168: A Late Stage in the Evolution of a Cold Front
We present Chandra observations of the cool cluster A168, for which previous X-ray imaging and optical studies indicated a merger of two subclusters nearly in the plane of the sky. We derive aExpand
Bow Shock and Radio Halo in the Merging Cluster A520
Chandra observations of the merging galaxy cluster A520 reveal a prominent bow shock with M = 2.1. This is only the second clear example of a substantially supersonic merger shock front in clusters.Expand
The X-ray subcluster in A 2256: cluster mergers, cooling flows and diffuse radio sources
ROSAT X-ray image of the cluster A2256 have recently resolved the cluster core into two peaks, separated by a projected distance of about 3.5 arcmin. The second peak is interpreted as a lowerExpand
A STUDY OF THE DARK CORE IN A520 WITH THE HUBBLE SPACE TELESCOPE: THE MYSTERY DEEPENS*
We present a Hubble Space Telescope/Wide Field Planetary Camera 2 weak-lensing study of A520, where a previous analysis of ground-based data suggested the presence of a dark mass concentration. WeExpand
A Dark Core in Abell 520
The rich cluster Abell 520 (z = 0.201) exhibits truly extreme and puzzling multiwavelength characteristics. It may best be described as a "cosmic train wreck." It is a major merger showing abundantExpand
ON DARK PEAKS AND MISSING MASS: A WEAK-LENSING MASS RECONSTRUCTION OF THE MERGING CLUSTER SYSTEM A520*, **
Merging clusters of galaxies are unique in their power to directly probe and place limits on the self-interaction cross-section of dark matter. Detailed observations of several merging clusters haveExpand
Chandra Temperature Map of A754 and Constraints on Thermal Conduction
We use Chandra data to derive a detailed gas temperature map of the nearby, hot, merging galaxy cluster A754. Combined with the X-ray and optical images, the map reveals a more complex mergerExpand
Subaru Weak Lensing Study of Seven Merging Clusters: Distributions of Mass and Baryons
We present and compare projected distributions of mass, galaxies, and the intracluster medium (ICM) for a sample of merging clusters of galaxies based on the joint weak-lensing, optical photometric,Expand
Chandra X-Ray Observations of the Hydra A Cluster: An Interaction between the Radio Source and the X-Ray-emitting Gas.
TLDR
Ch Chandra X-ray observations of the Hydra A cluster of galaxies are presented, and the discovery of structure in the central 80 kpc of the cluster's X-Ray-emitting gas is reported, suggesting that the gas within the surface brightness depressions was displaced as the radio lobes expanded subsonically, leaving cavities in the hot atmosphere. Expand
The Origin of Cold Fronts in the Cores of Relaxed Galaxy Clusters
Chandra X-ray observations revealed the presence of cold fronts (sharp contact discontinuities between gas regions with different temperatures and densities) in the centers of many, if not most,Expand
...
1
2
3
4
5
...