Mami Machida
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View article: Three-dimensional Polarimetric Structure of Jets from Radio Galaxy MRC 0600–399 in A3376
Three-dimensional Polarimetric Structure of Jets from Radio Galaxy MRC 0600–399 in A3376 Open
MRC 0600–399, in the merging galaxy cluster A3376, is one of the unique head–tail radio galaxies that have abruptly bending structures, the origin of which is still under discussion. A previous study suggested that the interaction between …
View article: Arcsecond-scale X-ray imaging and spectroscopy of SS 433 with the Chandra High-Energy Transmission Grating
Arcsecond-scale X-ray imaging and spectroscopy of SS 433 with the Chandra High-Energy Transmission Grating Open
We present a spatial and spectral analysis of arcsecond-scale X-ray emission in SS 433 using zeroth-order data from Chandra High-Energy Transmission Grating observations. The analysis is based on 24 observations acquired between 1999 and 2…
View article: Three-Dimensional Polarimetric Structure of Jets from Radio Galaxy MRC 0600-399 in A3376
Three-Dimensional Polarimetric Structure of Jets from Radio Galaxy MRC 0600-399 in A3376 Open
MRC 0600-399, in the merging galaxy cluster Abell 3376, is one of the unique Head-Tail radio galaxies having abruptly bending structures, the origin of which is still under discussion. A previous study suggested that the interaction betwee…
View article: Simulations of two-temperature jets in galaxy clusters: II. X-ray property of forward shock
Simulations of two-temperature jets in galaxy clusters: II. X-ray property of forward shock Open
Forward shocks by radio jets, driven into the intracluster medium, are one of the indicators that can be used to evaluate the power of the jet. Meanwhile high-angular-resolution X-ray observations show the Mach numbers of powerful radio je…
View article: Simulations of two-temperature jets in galaxy clusters
Simulations of two-temperature jets in galaxy clusters Open
Context. Forward shocks by radio jets, driven into the intracluster medium, are one of the indicators that can be used to evaluate the power of the jet. Meanwhile, high-angular-resolution X-ray observations show the Mach numbers of powerfu…
View article: Simulations of two-temperature jets in galaxy clusters
Simulations of two-temperature jets in galaxy clusters Open
Context. Non-radiating protons in the radio lobes play an essential role in shaping the jet morphology, as demonstrated in recent radio and X-ray observations. However, since protons and electrons are not always in energy equilibrium due t…
View article: Simulations of two-temperature jets in galaxy clusters: I. Effect of jet magnetization on dynamics and electron heating
Simulations of two-temperature jets in galaxy clusters: I. Effect of jet magnetization on dynamics and electron heating Open
Non-radiating protons in the radio lobes have an essential role to form the jet morphology which is shown by recent radio and X-ray observations. However, since protons and electrons are not always in energy equilibrium due to weak Coulomb…
View article: Exact Calculation of Nonideal Fields Demonstrates Their Dominance of Injection in Relativistic Reconnection
Exact Calculation of Nonideal Fields Demonstrates Their Dominance of Injection in Relativistic Reconnection Open
Magnetic reconnection is an important source of energetic particles in systems ranging from astrophysics to the laboratory. The large separation of spatiotemporal scales involved makes it critical to determine the minimum physical model co…
View article: Nonthermal Emissions from a Head–Tail Radio Galaxy in 3D Magnetohydrodynamic Simulations
Nonthermal Emissions from a Head–Tail Radio Galaxy in 3D Magnetohydrodynamic Simulations Open
We present magnetohydrodynamic simulations of a jet–wind interaction in a galaxy cluster and the radio to gamma-ray and neutrino emissions from this “head–tail galaxy.” Our simulation follows the evolution of cosmic-ray (CR) particle spect…
View article: Non-thermal emissions from a head-tail radio galaxy in 3D magnetohydrodynamic simulations
Non-thermal emissions from a head-tail radio galaxy in 3D magnetohydrodynamic simulations Open
We present magnetohydrodynamic simulations of a jet-wind interaction in a galaxy cluster and the radio to gamma-ray and the neutrino emissions from this "head-tail galaxy". Our simulation follows the evolution of cosmic-ray (CR) particle s…
View article: Molecular clouds at the eastern edge of radio nebula W50
Molecular clouds at the eastern edge of radio nebula W50 Open
Microquasar SS 433 located at the geometric center of radio nebula W50 is a suitable source for investigating the physical process of how galactic jets affect the surrounding interstellar medium (ISM). Previous studies have searched for ev…
View article: Molecular clouds at the eastern edge of radio nebula W 50
Molecular clouds at the eastern edge of radio nebula W 50 Open
Microquasar SS 433 located at the geometric center of radio nebula W 50 is a suitable source for investigating the physical process of how galactic jets affect the surrounding interstellar medium (ISM). Previous studies have searched for e…
View article: Pseudo-observation of spiral galaxies in the radio band to verify depolarization models
Pseudo-observation of spiral galaxies in the radio band to verify depolarization models Open
Studies of the three-dimensional structures of galactic magnetic fields are now entering a new era, with broad-band, highly sensitive radio observations and new analysis methods. To reveal the magnetic field configuration from the observed…
View article: Tomographic analysis of gravitational lens galaxies with cm-wavelength polarimetry
Tomographic analysis of gravitational lens galaxies with cm-wavelength polarimetry Open
Galactic magnetic fields play important roles in various astrophysical processes, yet the cosmological evolution of galactic magnetic fields is largely unknown.To unveil the evolution, observing magnetic fields of distant galaxies is essen…
View article: Effects of depolarizing intervening galaxies on background radio emission. I. Global disk magnetic field
Effects of depolarizing intervening galaxies on background radio emission. I. Global disk magnetic field Open
External galaxies often intervene in front of background radio sources such as quasars and radio galaxies. Linear polarization of the background emission is depolarized by Faraday rotation of inhomogeneous magnetized plasma of the interven…
View article: Jets from MRC 0600-399 bent by magnetic fields in the cluster Abell 3376
Jets from MRC 0600-399 bent by magnetic fields in the cluster Abell 3376 Open
Galaxy clusters are known to harbour magnetic fields. The nature of the intra-cluster magnetic fields remains an unresolved question. Intra-cluster magnetic field can be observed at the density contact discontinuity formed by cool and dens…
View article: Energy estimation of high-energy particles associated with the SS 433/W 50 system through radio observation at 1.4 GHz
Energy estimation of high-energy particles associated with the SS 433/W 50 system through radio observation at 1.4 GHz Open
The radio nebula W 50 is a unique object interacting with the jets of the microquasar SS 433. The SS 433/W 50 system is a good target for investigating the energy of cosmic-ray particles accelerated by galactic jets. We report observations…
View article: Evidence of an interaction between jets and intra-cluster magnetic layer
Evidence of an interaction between jets and intra-cluster magnetic layer Open
Galaxy clusters are known to harbor magnetic field, however, the extent of the influence of the intra-cluster magnetic field on the cluster member galaxies remains an unresolved question. Intra-cluster magnetic field can be observed as den…
View article: Two-temperature magnetohydrodynamic simulations for sub-relativistic active galactic nucleus jets: dependence on the fraction of the electron heating
Two-temperature magnetohydrodynamic simulations for sub-relativistic active galactic nucleus jets: dependence on the fraction of the electron heating Open
We present the results of two-temperature magnetohydrodynamic simulations of the propagation of sub-relativistic jets of active galactic nuclei. The dependence of the electron and ion temperature distributions on the fraction of electron h…
View article: Workshop summary 'The Power of Faraday Tomography'
Workshop summary 'The Power of Faraday Tomography' Open
This article summarizes the work presented at the workshop 'The Power of Faraday Tomography: towards 3D mapping of cosmic magnetic fields', held in Miyazaki, Japan, in Spring 2018. We place the various oral and poster presentations given a…
View article: Workshop Summary “The Power of Faraday Tomography”
Workshop Summary “The Power of Faraday Tomography” Open
This article summarizes the work presented at the workshop “The Power of Faraday Tomography: towards 3D mapping of cosmic magnetic fields”, held in Miyazaki, Japan, in Spring 2018. We place the various oral and poster presentations given a…
View article: 2D MHD Simulations of the State Transitions of X-Ray Binaries Taking into Account Thermal Conduction
2D MHD Simulations of the State Transitions of X-Ray Binaries Taking into Account Thermal Conduction Open
Thermal conduction plays an important role in bimodal accretion flows consisting of high-temperature flow and cool flow, especially when the temperature is high and/or has a steep gradient. For example, in hard-to-soft transitions of black…
View article: Faraday Depolarization Effects in Spiral Galaxies
Faraday Depolarization Effects in Spiral Galaxies Open
Magnetic fields in the universe play an essential role in observations of the radio synchrotron continuum; however, we do not know enough about them, either observationally or theoretically. We are interested in galactic magnetic fields be…
View article: Two-Temperature Magnetohydrodynamics Simulations of Propagation of Semi-Relativistic Jets
Two-Temperature Magnetohydrodynamics Simulations of Propagation of Semi-Relativistic Jets Open
In astrophysical jets observed in active galactic nuclei and in microquasars, the energy exchange rate by Coulomb collision is insufficient for thermal equilibrium between ions and electrons. Therefore, it is necessary to consider the diff…
View article: Faraday Tomography of the SS433 Jet Termination Region
Faraday Tomography of the SS433 Jet Termination Region Open
A jet termination region provides us with useful information about how a jet interacts with the interstellar medium. Identifying the strength and orientation of magnetic fields at the terminal is crucially important to understanding the me…
View article: Radio broad-band visualization of global three-dimensional magnetohydrodynamical simulations of spiral galaxies – II. Faraday depolarization from 100 MHz to 10 GHz
Radio broad-band visualization of global three-dimensional magnetohydrodynamical simulations of spiral galaxies – II. Faraday depolarization from 100 MHz to 10 GHz Open
Observational study of galactic magnetic fields is limited by projected observables. Comparison with numerical simulations is helpful to understand the real structures, and observational visualization of numerical data is an important task…
View article: Radio broadband visualization of global three-dimensional magnetohydrodynamical simulations of spiral galaxies – I. Faraday rotation at 8 GHz
Radio broadband visualization of global three-dimensional magnetohydrodynamical simulations of spiral galaxies – I. Faraday rotation at 8 GHz Open
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View article: Magnetic activity in the Galactic Centre region – fast downflows along rising magnetic loops
Magnetic activity in the Galactic Centre region – fast downflows along rising magnetic loops Open
We studied roles of the magnetic field on the gas dynamics in the Galactic\nbulge by a three-dimensional global magnetohydrodynamical simulation data,\nparticularly focusing on vertical flows that are ubiquitously excited by\nmagnetic acti…
View article: Investigating Magnetic Activity in the Galactic Centre by Global MHD Simulation
Investigating Magnetic Activity in the Galactic Centre by Global MHD Simulation Open
By performing a global magnetohydrodynamical (MHD) simulation for the Milky Way with an axisymmetric gravitational potential, we propose that spatially dependent amplification of magnetic fields possibly explains the observed noncircular m…