A5074160423- Astrophysics and Cosmic Phenomena
- Galaxies: Formation, Evolution, Phenomena
- Astrophysical Phenomena and Observations
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Astrophysics and Star Formation Studies
- Solar and Space Plasma Dynamics
- Scientific Research and Discoveries
- Parallel Computing and Optimization Techniques
- Magnetic confinement fusion research
- Distributed and Parallel Computing Systems
- Embedded Systems Design Techniques
Kagoshima University
2022-2023
National Astronomical Observatory of Japan
2022
Kyushu University
2018-2021
Abstract Magnetic hot stars can emit both coherent and incoherent nonthermal radio emission. Understanding the nature of these emissions their connection to stellar rotation magnetic field characteristics remains incomplete. The RAdio Magnetospheres B O (RAMBO) project aims address this gap by systematically detecting characterizing gyrosynchrotron cyclotron maser emission in rapidly rotating stars. Using upgraded Giant Metrewave Radio Telescope, we present first detection from HD 55522 at...
Abstract We present the initial results of our MeerKAT L-band observations Abell 3376. achieved higher (5″) angular resolution and better (∼4 μ Jy beam−1) sensitivity compared to previous observations. Our is only a factor 2 larger than thermal noise MeerKAT. Astrometric flux comparison discrete compact sources in field between Very Large Array (VLA) indicated that calibration procedures were successful. detected West East relics, radio galaxies, which have been observed works. With minimal...
Abstract We report a polarization analysis of the eastern region W 50, observed with Australia Telescope Compact Array (ATCA) at 1.4–3.0 GHz. In order to study physical structures in where SS 433 jet and 50 interact, we obtain an intrinsic magnetic field vector map that region. find orientation vectors are aligned along total intensity structures, there characteristic, separate related jet, bow shock, terminal shock. The Faraday rotation measures (RMs), results tomography suggest...
Abstract Microquasar SS 433 located at the geometric center of radio nebula W 50 is a suitable source for investigating physical process how galactic jets affect surrounding interstellar medium (ISM). Previous studies have searched evidence interaction between jet and ISM, such as neutral hydrogen gas molecular clouds; however, it still unclear which ISM interacts with jet. We looked new clouds that possibly interact terminal eastern using Nobeyama 45 m telescope Atacama Submillimeter...
The radio nebula W50 is a unique object interacting with the jets of microquasar SS433. SS433/W50 system good target for investigating energy cosmic-ray particles accelerated by galactic jets. We report observations conducted NSF's Karl G. Jansky Very Large Array (VLA) in L band (1.0 -- 2.0 GHz). investigate secular change on basis 1984, 1996, and 2017, find that most its structures were stable 33 years. revise upper limit velocity eastern terminal filament half to 0.023$c$ assuming distance...
A jet termination region provides us with useful information about how a interacts the interstellar medium. Identifying strength and orientation of magnetic fields at terminal is crucially important to understanding mechanism cosmic-ray acceleration. In this article, we report results our Faraday-tomography analysis eastern radio nebula W50, where from microquasar SS433 seems terminate. We apply QU-fitting, method Faraday-tomography, data Australia Telescope Compact Array (ATCA) 1.3–3.0 GHz....
Magnetic hot stars can emit both coherent and incoherent non-thermal radio emission. Understanding the nature of these emissions their connection to stellar rotation magnetic field characteristics remains incomplete. The RAdio Magnetospheres B O (RAMBO) project aims address this gap by systematically detecting characterizing gyrosynchrotron cyclotron maser emission in rapidly rotating stars. Using upgraded Giant Metrewave Radio Telescope, we present first detection from HD55522 at 650 MHz,...
We present magnetohydrodynamic simulations of a jet-wind interaction in galaxy cluster and the radio to gamma-ray neutrino emissions from this "head-tail galaxy". Our simulation follows evolution cosmic-ray (CR) particle spectra with energy losses stochastic turbulence acceleration. find that reacceleration is essential explain observed properties head-tail galaxies, which flux spectral index do not drastically change. models suggest hard X-ray can be detected around Perseus by satellites,...
Abstract We present magnetohydrodynamic simulations of a jet–wind interaction in galaxy cluster and the radio to gamma-ray neutrino emissions from this “head–tail galaxy.” Our simulation follows evolution cosmic-ray (CR) particle spectra with energy losses stochastic turbulence acceleration. find that reacceleration is essential explaining observed properties head–tail galaxies, which flux spectral index do not drastically change. models suggest hard X-ray can be detected around Perseus by...
Abstract The formation mechanism of the W50/SS 433 complex has long been a mystery. We propose new scenario in which SS jets themselves form system. carry out magnetohydrodynamics simulations propagation two side using public code CANS+. As found previous jet studies, when propagating is lighter than surrounding medium, shocked plasma flows back from tip to core. find that morphology light spheroidal at early times; afterward, shell and wings are developed by broadening spherical cocoon....
Microquasar SS 433 located at the geometric center of radio nebula W50 is a suitable source for investigating physical process how galactic jets affect surrounding interstellar medium (ISM). Previous studies have searched evidence interaction between jet and ISM, such as neutral hydrogen gas molecular clouds; however, it still unclear which ISM interacts with jet. We looked new clouds that possibly interact terminal eastern using Nobeyama 45-m telescope Atacama Submillimeter Telescope...
Abstract Galaxy clusters are known to harbor magnetic field, however, the extent of influence intra-cluster field on cluster member galaxies remains an unresolved question. Intra-cluster can be observed as density contact discontinuity formed by cool and dense plasma running into hot ambient plasma, this exist in central region a merging galaxy Abell 3376. Here we report unambiguous evidence interaction between relativistic electrons fields from MeerKAT observations radio MRC0600-399, having...
Abstract We examined the X-ray and radio spatial structure at eastern ear of W 50/SS 433 system to clarify a characteristic feature termination region SS jet, found that hot spot ahead filament structure, which is considered be terminal shock clearly different from single point source. The detailed emission finely resolved by Chandra observations, showing there are two sources. By comparing point-spread function with radial profiles sources, northern one more extended than source while other...