55 citations · 478 across the 23 of their papers we have counts for
23 papers
Comparing XRISM cluster velocity dispersions with predictions from cosmological simulations: are feedback models too ejective?
XRISM Collaboration, Marc Audard, Hisamitsu Awaki +147
The dynamics of the intra-cluster medium (ICM), the hot plasma that fills galaxy clusters, are shaped by gravity-driven cluster mergers and feedback from supermassive black holes (…
A Yin-Yang Galaxy Cluster Merger in Abell 1914 Revealed by XRISM
Annie Heinrich, Congyao Zhang, Irina Zhuravleva +4
Hierarchical mergers of galaxy clusters play a key role in converting gravitational energy into thermal and kinetic energy in the local universe. Understanding this process require…
Disentangling Multiple Gas Kinematic Drivers in the Perseus Galaxy Cluster
XRISM Collaboration, Marc Audard, Hisamitsu Awaki +143
Galaxy clusters, the Universe's largest halo structures, are filled with 10-100 million degree X-ray-emitting gas. Their evolution is shaped by energetic processes such as feedback…
Decoding AGN Feedback with X-arithmetic: From Morphology to Physical Mechanisms
Hannah McCall, Irina Zhuravleva, Eugene Churazov +4
Feedback from Active Galactic Nuclei (AGN) is a key process in the evolution of massive halos in the Universe. New observational information on feedback is crucial for improving th…
Merger-driven multi-scale ICM density perturbations: testing cosmological simulations and constraining plasma physics
Annie Heinrich, Irina Zhuravleva, Congyao Zhang +3
The hot intracluster medium (ICM) provides a unique laboratory to test multi-scale physics in numerical simulations and probe plasma physics. Utilizing archival Chandra observation…
Exploring chemical enrichment of the intracluster medium with the Line Emission Mapper
François Mernier, Yuanyuan Su, Maxim Markevitch +27
Synthesized in the cores of stars and supernovae, most metals disperse over cosmic scales and are ultimately deposited well outside the gravitational potential of their host galaxi…
Mapping the Intracluster Medium in the Era of High-resolution X-ray Spectroscopy
Congyao Zhang, Irina Zhuravleva, Maxim Markevitch +24
High-resolution spectroscopy in soft X-rays will open a new window to map multiphase gas in galaxy clusters and probe physics of the intracluster medium (ICM), including chemical e…
Line Emission Mapper (LEM): Probing the physics of cosmic ecosystems
Ralph Kraft, Maxim Markevitch, Caroline Kilbourne +107
The Line Emission Mapper (LEM) is an X-ray Probe for the 2030s that will answer the outstanding questions of the Universe's structure formation. It will also provide transformative…
Indirect Measurements of Gas Velocities in Galaxy Clusters: Effects of Ellipticity and Cluster Dynamic State
Irina Zhuravleva, Mandy C. Chen, Eugene Churazov +3
While awaiting direct velocity measurement of gas motions in the hot intracluster medium, we rely on indirect probes, including gas perturbations in galaxy clusters. Using a sample…
Bubble-driven Gas Uplift in Galaxy Clusters and its Velocity Features
Congyao Zhang, Irina Zhuravleva, Marie-Lou Gendron-Marsolais +3
Buoyant bubbles of relativistic plasma are essential for active galactic nucleus feedback in galaxy clusters, stirring and heating the intracluster medium (ICM). Observations sugge…
Evolution of Splashback Boundaries and Gaseous Outskirts: Insights from Mergers of Self-similar Galaxy Clusters
Congyao Zhang, Irina Zhuravleva, Andrey Kravtsov +1
A self-similar spherical collapse model predicts a dark matter (DM) splashback and accretion shock in the outskirts of galaxy clusters while misses a key ingredient of structure fo…
Pairs of Giant Shock Waves (N-Waves) in Merging Galaxy Clusters
Congyao Zhang, Eugene Churazov, Irina Zhuravleva
When a subcluster merges with a larger galaxy cluster, a bow shock is driven ahead of the subcluster. At a later merger stage, this bow shock separates from the subcluster, becomin…
Collision of Merger and Accretion Shocks: Formation of Mpc-scale Contact Discontinuity in the Perseus Cluster
Congyao Zhang, Eugene Churazov, Klaus Dolag +2
Two Mpc-size contact discontinuities have recently been identified in the XMM-Newton and Suzaku X-ray observations of the outskirts of the Perseus cluster (Walker et al. 2020). The…
Encounters of Merger and Accretion Shocks in Galaxy Clusters and their Effects on Intracluster Medium
Congyao Zhang, Eugene Churazov, Klaus Dolag +2
Several types/classes of shocks naturally arise during formation and evolution of galaxy clusters. One such class is represented by accretion shocks, associated with deceleration o…
Runaway Merger Shocks in Galaxy Cluster Outskirts and Radio Relics
Congyao Zhang, Eugene Churazov, William R. Forman +1
Moderately strong shocks arise naturally when two subclusters merge. For instance, when a smaller subcluster falls into the gravitational potential of a more massive cluster, a bow…
Turbulence decay in the density-stratified intracluster medium
Xun Shi, Congyao Zhang
Turbulence evolution in a density-stratified medium differs from that of homogeneous isotropic turbulence described by the Kolmogorov picture. We evaluate the degree of this effect…
Close-up view of an ongoing merger between the NGC 4839 group and the Coma cluster - a post-merger scenario
N. Lyskova, E. Churazov, C. Zhang +5
We study a merger of the NGC 4839 group with the Coma cluster using X-ray observations from the XMM-Newton and Chandra telescopes. X-ray data show two prominent features: (i) a lon…
Standoff Distance of Bow Shocks in Galaxy Clusters as Proxy for Mach Number
Congyao Zhang, Eugene Churazov, William R. Forman +1
X-ray observations of merging clusters provide many examples of bow shocks leading merging subclusters. While the Mach number of a shock can be estimated from the observed density…
Generation of Internal Waves by Buoyant Bubbles in Galaxy Clusters and Heating of Intracluster Medium
Congyao Zhang, Eugene Churazov, Alexander A. Schekochihin
Buoyant bubbles of relativistic plasma in cluster cores plausibly play a key role in conveying the energy from a supermassive black hole to the intracluster medium (ICM) - the proc…
Simulating the galaxy cluster "El Gordo": gas motion, kinetic Sunyaev-Zel'dovich signal, and X-ray line features
Congyao Zhang, Qingjuan Yu, Youjun Lu
The massive galaxy cluster "El Gordo" (ACT-CL J0102--4915) is a rare merging system with a high collision speed suggested by multi-wavelength observations and the theoretical model…
A Baryonic Effect on the Merger Timescale of Galaxy Clusters
Congyao Zhang, Qingjuan Yu, Youjun Lu
Accurate estimation of the merger timescale of galaxy clusters is important to understand the cluster merger process and further the formation and evolution of the large-scale stru…
Simulating the galaxy cluster "El Gordo" and identifying the merger configuration
Congyao Zhang, Qingjuan Yu, Youjun Lu
The observational features of the massive galaxy cluster "El Gordo" (ACT-CL J0102-4915), such as the X-ray emission, the Sunyaev-Zel'dovich (SZ) effect, and the surface mass densit…
Offsets between the X-ray and the Sunyaev-Zel'dovich-effect peaks in merging galaxy clusters and their cosmological implications
Congyao Zhang, Qingjuan Yu, Youjun Lu
Observations reveal that the peaks of the X-ray map and the Sunyaev-Zel'dovich (SZ) effect map of some galaxy clusters are offset from each other. In this paper, we perform a set o…