A5082317316- Astrophysics and Cosmic Phenomena
- Gamma-ray bursts and supernovae
- Radio Astronomy Observations and Technology
- Particle Detector Development and Performance
- Galaxies: Formation, Evolution, Phenomena
- Neutrino Physics Research
- Astrophysical Phenomena and Observations
- Radiation Detection and Scintillator Technologies
- Laser Design and Applications
- Adaptive optics and wavefront sensing
- Internet of Things and Social Network Interactions
- Power Systems and Technologies
- Engineering Applied Research
- Photocathodes and Microchannel Plates
- Spectroscopy and Laser Applications
- Astronomical Observations and Instrumentation
- Dark Matter and Cosmic Phenomena
- Superconducting and THz Device Technology
- Advanced X-ray Imaging Techniques
- Astronomy and Astrophysical Research
- Advanced Optical Sensing Technologies
Saitama University
2019-2023
Japan Aerospace Exploration Agency
2023
Institute of Space and Astronautical Science
2023
Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas
2020
Kyoto University
2020
A far-infrared counterpart to the west hot spot of radio galaxy Pictor is discovered with Spectral and Photometric Imaging REceiver (SPIRE) onboard Herschel. The color-corrected flux density source measured as $70.0 \pm 9.9$ mJy at wavelength 350 $\mu$m. close investigation into its radio-to-optical spectrum indicates that mid-infrared excess over synchrotron component, detected WISE Spitzer, significantly contributes band. Thanks SPIRE data, it revealed described by a broken power-law model...
The far infrared counterpart of hot spot D, the terminal eastern jet hosted by radio galaxy Cygnus A, is detected with \textit{Herschel} Aperture photometery source performed in 5 photometric bands covering wavelength range $70\unicode{x2013}350$ $\mathrm{\mu m}$. After removing contamination from another nearby spot, E, far-infrared intensity D derived as $83\pm13$ and $269\pm66$ mJy at $160$ $350$ m}$, respectively. Since spectrum object smoothly connects to one, emission attributed...
Abstract Utilizing Chandra, XMM-Newton, and NuSTAR, a wide-band X-ray spectrum from 0.2 to 20 keV is reported the western hotspot of Pictor A. In particular, emission significantly detected in 3 band at 30σ by NuSTAR. This first detection hard X-rays with energies above 10 jet termination active galactic nuclei. The well described power-law model photon index Γ = 1.8 ± 0.2, flux obtained be (4.5 0.4) × 10−13 erg s−1 cm−2 band. smoothly connected those soft spectra observed Chandra...
In an outdoor DC power supply system that enables bidirectional transfer of 380V between multiple buildings, a short circuit causes coordination problem in protection, resulting outage the bus wiring. this paper, we propose protection method only isolates fault point while continuing to healthy load wiring when occurs.
The Cherenkov Telescope Array (CTA) represents the next generation of very high-energy gamma-ray observatory, which will provide broad coverage gamma rays from 20 GeV to 300 TeV with unprecedented sensitivity. CTA employ three different sizes telescopes, and Large-Sized Telescopes (LSTs) 23-m diameter dish sensitivity in lowest energies down GeV. first LST prototype has been inaugurated October 2018 at La Palma (Canary Islands, Spain) entered commissioning phase. camera consists 265 PMT...
The Cherenkov Telescope Array (CTA) is the next-generation ground-based very-high-energy gamma-ray observatory. Large-Sized (LST) of CTA designed to detect gamma rays between 20 GeV and a few TeV with 23-meter diameter mirror. We have developed focal plane camera first LST, which has 1855 photomultiplier tubes (PMTs) readout system samples PMT waveform at GHz switched capacitor arrays, Domino Ring Sampler ver4 (DRS4). To measure precise pulse charge arrival time signals, we method calibrate...
High-speed-photon detectors are some of the most important tools for observations high energy cosmic rays. As technologies photon and their read-out electronics improved rapidly, time resolution ray became better than one nanosecond. To utilize such devices effectively, calibrations using a short-pulse light source necessary. We have developed pulsed laser 80 picosecond width adjustable peak intensity up to 100 mW. This is composed simple electric circuit diode. Details this its application...
We have developed a pulsed laser with pulsewidth of 70 ps in the full-width at half-maximum as light source for calibrating photon detectors. It has simple electric circuit that generates short pulses are applied to diode. By utilizing properties diode, beam is one-tenth pulse can be generated. Since shaping circuit, generated low cost, and device made compact, occupying only few cubic centimeters. Such short-pulsed-light sources useful high-energy experiments astronomical observation time...
In order to investigate the far-infrared excess detected from west hot spot of radio galaxy Pictor A with Herschel observatory, a submillimeter photometry is performed Atacama Compact Array (ACA) Large Millimeter/submillimeter at Band 8 reference frequency 405 GHz. source discovered peak spot. Because GHz flux density source, $80.7\pm3.1$ mJy, agrees extrapolation synchrotron spectrum, suggested exhibit no major contribution ACA band. contrast, by subtracting power-law spectrum tightly...
The observation of non-thermal radiation SNRs are essential for elucidating the mechanism particle acceleration. MAGIC and Fermi discovered very high energy (VHE) $\gamma$-ray from northern part SNR G78.2+2.1 (MAGIC Collaboration.,2020). This is suggested to be originated cosmic rays escaping SNR. However, it inconclusive since electron distribution not well estimated. To solve this problem, we analyzed data X-ray astronomy satellite Suzaku evaluate contribution leptonic emission broadband...
In order to investigate the far-infrared excess detected from west hot spot of radio galaxy Pictor A with Herschel observatory, a submillimeter photometry is performed Atacama Compact Array (ACA) Large Millimeter/submillimeter at Band 8 reference frequency 405 GHz. source discovered peak spot. Because GHz flux density source, $80.7\pm3.1$ mJy, agrees extrapolation synchrotron spectrum, suggested exhibit no major contribution ACA band. contrast, by subtracting power-law spectrum tightly...