Chandra Observations of the Spectacular A3411-12 Merger Event

Abstract

We present deep Chandra observations of A3411-12, a remarkable merging cluster that hosts the most compelling evidence for electron re-acceleration at cluster shocks to date. Using the $Y_X-M$ scaling relation, we find $r_{500}\sim 1.3$ Mpc, $M_{500}=(7.1\pm 0.7)\times 10^{14}{M}_{\odot }$, $kT=6.5\pm 0.1$ keV, and a gas mass of $M_{\mathrm{g},500}=(9.7\pm 0.1)\times 10^{13}{M}_{\odot }$. The gas mass fraction within $r_{500}$ is $f_{\mathrm{g}}=0.14\pm 0.01$. We compute the shock strength using density jumps to conclude that the Mach number of the merging subcluster is small ($M\le 1.15_{-0.09}^{+0.14}$). We also present pseudo-density, projected temperature, pseudo-pressure, and pseudo-entropy maps. Based on the pseudo-entropy map we conclude that the cluster is undergoing a mild merger, consistent with the small Mach number. On the other hand, radio relics extend over Mpc scale in the A3411-12 system, which strongly suggests that a population of energetic electrons already existed over extended regions of the cluster.

arXiv comment23 pages, 17 figures, 4 tables. Accepted for publication in ApJ

References in corpus (51)

• A direct empirical proof of the existence of dark matter
• Chandra sample of nearby relaxed galaxy clusters: mass, gas fraction, and mass-temperature relation
• MultiDark simulations: the story of dark matter halo concentrations and density profiles
• Constraints on the Self-Interaction Cross-Section of Dark Matter from Numerical Simulations of the Merging Galaxy Cluster 1E 0657-5
• Shocks and cold fronts in galaxy clusters
• Chandra Cluster Cosmology Project II: Samples and X-ray Data Reduction
• Weak lensing mass reconstruction of the interacting cluster 1E0657-558: Direct evidence for the existence of dark matter
• Clusters of galaxies : observational properties of the diffuse radio emission
• A Textbook Example of a Bow Shock in the Merging Galaxy Cluster 1E0657-56
• Chandra temperature profiles for a sample of nearby relaxed galaxy clusters
• A New Robust Low-Scatter X-ray Mass Indicator for Clusters of Galaxies
• Diffuse Radio Emission from Galaxy Clusters
• Comparing the temperatures of galaxy clusters from hydro-N-body simulations to Chandra and XMM-Newton observations
• Comparing the temperatures of galaxy clusters from hydro-N-body simulations to Chandra and XMM-Newton observations
• Planck Early Results VIII: The all-sky Early Sunyaev-Zeldovich cluster sample
• Particle Acceleration on Megaparsec Scales in a Merging Galaxy Cluster
• A moving cold front in the intergalactic medium of A3667
• Bow shock and radio halo in the merging cluster A520
• Strong and weak lensing united III: Measuring the mass distribution of the merging galaxy cluster 1E0657-56
• Revealing the properties of dark matter in the merging cluster MACSJ0025.4-1222
• Draping of Cluster Magnetic Fields over Bullets and Bubbles -- Morphology and Dynamic Effects
• The speed of the `bullet' in the merging galaxy cluster 1E0657-56
• Contour binning: a new technique for spatially-resolved X-ray spectroscopy applied to Cassiopeia A
• Quantifying the Morphologies and Dynamical Evolution of Galaxy Clusters. II. Application to a Sample of ROSAT Clusters
• The Case for Electron Re-Acceleration at Galaxy Cluster Shocks
• COSMOLOGICAL CONSTRAINTS FROM CLUSTER X-RAY MORPHOLOGIES
• Diffusive Shock Acceleration Simulations of Radio Relics
• The Atacama Cosmology Telescope: ACT-CL J0102-4915 "El Gordo," a Massive Merging Cluster at Redshift 0.87
• The "toothbrush-relic": evidence for a coherent linear 2-Mpc scale shock wave in a massive merging galaxy cluster?
• Magnetic draping of merging cores and radio bubbles in clusters of galaxies
• Discovery of a Dissociative Galaxy Cluster Merger with Large Physical Separation
• The Evolution of Structure in X-ray Clusters of Galaxies
• Sunyaev-Zel'dovich-Measured Pressure Profiles from the Bolocam X-ray/SZ Galaxy Cluster Sample
• A High Fidelity Sample of Cold Front Clusters from the Chandra Archive
• Challenges to our understanding of radio relics: X-ray observations of the Toothbrush cluster
• The rise and fall of star-formation in $\mathbf{z}\sim 0.2$ merging galaxy clusters
• MC${}^2$: Boosted AGN and star-formation activity in CIZA J2242.8+5301, a massive post-merger cluster at z=0.19
• A merger mystery: no extended radio emission in the merging cluster Abell 2146
• Shock Waves and Cosmic Ray Acceleration in the Outskirts of Galaxy Clusters
• First X-ray evidence for a shock at the Coma relic
• Star formation efficiency in galaxy clusters
• Spiral-like structure in nearby clusters of galaxies
• A large H$\alpha$ survey of star formation in relaxed and merging galaxy cluster environments at $z\sim 0.15-0.3$
• The impact of a major cluster merger on galaxy evolution in MACS\,J0025.4-1225
• Complex diffuse radio emission in the merging PLANCK ESZ cluster Abell 3411
• A New Method to Quantify X-ray Substructures in Clusters of Galaxies
• Dark Matter Subhalos and the X-ray Morphology of the Coma Cluster
• No Shock Across Part of a Radio Relic in the Merging Galaxy Cluster ZwCl 2341.1+0000?
• On the Origin of Cool Core Galaxy Clusters: Comparing X-Ray Observations with Numerical Simulations
• The nature of the giant diffuse non-thermal source in the A3411-A3412 complex
• Dynamics of Merging Galaxy Clusters from Simulated Analogs

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• Exploring the spectral properties of radio relics I: Integrated spectral index and Mach number
• Head-to-Toe Measurement of El Gordo: Improved Analysis of the Galaxy Cluster ACT-CL J0102-4915 with New Wide-field Hubble Space Telescope Imaging Data
• X-ray study of the merging galaxy cluster Abell 3411-3412 with XMM-Newton and Suzaku
• On the detection of multiple shock fronts in A1914 using deep Chandra X-ray observations
• Protruding bullet heads indicating dark matter pull
• The application of the adiabatic compression scenario to the radio relic in the galaxy cluster Abell 3411-3412