151 citations · 1.9k across the 51 of their papers we have counts for
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Hard X-ray Properties of the Merging Cluster Abell 3667 as Observed with Suzaku
Kazuhiro Nakazawa, Craig L. Sarazin, Madoka Kawaharada +10
Wide-band Suzaku data on the merging cluster Abell 3667 were examined for hard X-ray emission in excess to the known thermal component. Suzaku detected X-ray signals in the wide en…
N-body + Magnetohydrodynamical Simulations of Merging Clusters of Galaxies: Characteristic Magnetic Field Structures Generated by Bulk Flow Motion
Motokazu Takizawa
We present results from N-body + magnetohydrodynamical simulations of merging clusters of galaxies. We find that cluster mergers cause various characteristic magnetic field structu…
Suzaku Observation of the Ophiuchus Galaxy Cluster: One of the Hottest Cool Core Clusters
Yutaka Fujita, Kiyoshi Hayashida, Masaaki Nagai +6
We present the analysis of a Suzaku observation of the Ophiuchus galaxy cluster. We confirmed that the cluster has a cool core. While the temperature of the intracluster medium (IC…
High Metallicity of the X-Ray Gas up to the Virial Radius of a Binary Cluster of Galaxies: Evidence of Galactic Superwinds at High-Redshift
Yutaka Fujita, Noriaki Tawa, Kiyoshi Hayashida +4
We present an analysis of a Suzaku observation of the link region between the galaxy clusters A399 and A401. We obtained the metallicity of the intracluster medium (ICM) up to the…
On the X-Ray and Mass Distribution in the Merging Galaxy Cluster 1E 0657-56: Ram Pressure-Stripping in Substructures with an NFW Density Profile
Motokazu Takizawa
We investigate the X-ray and mass distribution in the merging galaxy cluster 1E 0657-56. We study head-on collisions of two virialized clusters with an NFW density profile in the $…
Hydrodynamic Simulations of A Moving Substructure in A Cluster of Galaxies: Cold Fronts and Turbulence Generation
Motokazu Takizawa
We perform three dimensional hydrodynamical simulations of a moving substructure in a cluster of galaxies. We investigate dynamical evolution of the intracluster medium (ICM) in an…
Turbulence Generation by Substructure Motion in Clusters of Galaxies
Motokazu Takizawa
Clusters of galaxies form through major merger and/or absorption of smaller groups. In fact, some characteristic structures such as cold fronts, which are likely relevant to moving…
Chandra Observations of the Central Region of Abell 3112
Motokazu Takizawa, Craig L. Sarazin, Elizabeth L. Blanton +1
We present the results of a {\it Chandra} observation of the central region of Abell 3112. This cluster has a powerful radio source in the center and was believed to have a strong…
Nonthermal Emissions from Particles Accelerated by Turbulence in Clusters of Galaxies
Yutaka Fujita, Motokazu Takizawa, Craig L. Sarazin
We consider nonthermal emission from clusters of galaxies produced by particle acceleration by resonant scattering of Alfvén waves driven by fluid turbulence through the Lighthill…
Radio Halo Formation through Magneto-turbulent Particle Acceleration in Clusters of Galaxies
Hiroshi Ohno, Motokazu Takizawa, Shinpei Shibata
We developed a magneto-turbulent model for the cosmic ray (CR) electrons seen in the radio halo clusters of galaxies. Steady state momentum distribution functions of the CR electro…
Evolution of Hard X-Ray Radiation from Clusters of Galaxies: Bremsstrahlung or Inverse Compton Scattering?
Motokazu Takizawa
We have calculated evolution of a non-thermal electron population from super-thermal but weakly relativistic to highly relativistic energy range in clusters of galaxies. We investi…
Non-Thermal Emission from Relativistic Electrons in Clusters of Galaxies: A Merger Shock Acceleration Model
Motokazu Takizawa, Tsuguya Naito
We have investigated evolution of non-thermal emission from relativistic electrons accelerated at around the shock fronts during merger of clusters of galaxies. We estimate synchro…
Off-Center Mergers of Clusters of Galaxies and Nonequipartition of Electrons and Ions in Intracluster Medium
Motokazu Takizawa
We investigate the dynamical evolution of clusters of galaxies and their observational consequences during off-center mergers, explicitly considering the relaxation process between…
Time evolution of galactic warps in prolate haloes
Makoto Ideta, Shunsuke Hozumi, Toshio Tsuchiya +1
A recent observation with the Hipparcos satellite and some numerical simulations imply that the interaction between an oblate halo and a disc is inappropriate for the persistence o…
Is Galactic Star Formation Activity Increased During Cluster Mergers?
Yutaka Fujita, Motokazu Takizawa, Masahiro Nagashima +1
We have investigated the effect of pressure from intracluster medium (ICM) on disk galaxies in merging clusters. The ram-pressure on the galaxies rapidly increases when two cluster…
Two-Temperature Intracluster Medium in Merging Clusters of Galaxies
Motokazu Takizawa
We investigate the evolution of intracluster medium during a cluster merger, explicitly considering the relaxation process between the ions and electrons by N-body and hydrodynamic…
A Two-Temperature Model of the Intracluster Medium
Motokazu Takizawa
We investigate evolution of the intracluster medium (ICM), considering the relaxation process between the ions and electrons. According to the standard scenario of structure format…
Evolution of X-Ray Clusters of Galaxies and Shock Heating of Intracluster Medium
Motokazu Takizawa, Shin Mineshige
Evolutions of X-ray clusters of galaxies are studied by N-body (shell model) + mesh code (TVD) simulations on the assumption of spherical symmetry. We consider a density perturbati…
Violent Relaxation of Spherical Stellar Systems
Motokazu Takizawa, Shogo Inagaki
Violent relaxation process of spherical stellar systems is examined by numerical simulations of shell model. The collapse of uniform density sphere both with and without external f…