A5059458078- Gamma-ray bursts and supernovae
- Astronomical Observations and Instrumentation
- SAS software applications and methods
- Astrophysical Phenomena and Observations
- Astronomy and Astrophysical Research
- Pulsars and Gravitational Waves Research
- Particle Detector Development and Performance
- Astrophysics and Cosmic Phenomena
- Solar and Space Plasma Dynamics
- Geophysics and Gravity Measurements
- Statistical and numerical algorithms
- Stellar, planetary, and galactic studies
- Advanced X-ray Imaging Techniques
- Astro and Planetary Science
- Fuel Cells and Related Materials
- Galaxies: Formation, Evolution, Phenomena
- Reconstructive Facial Surgery Techniques
- Nuclear Physics and Applications
- Ovarian cancer diagnosis and treatment
- Advanced X-ray and CT Imaging
- Calibration and Measurement Techniques
- Reconstructive Surgery and Microvascular Techniques
- Endometrial and Cervical Cancer Treatments
- Advancements in Solid Oxide Fuel Cells
- Medical Imaging Techniques and Applications
Osaka Metropolitan University
2023-2025
University of Miyazaki
2014-2025
Nara Women's University
2024-2025
Tokyo City University
2024
Kanazawa University
2008-2024
Tokyo Metropolitan University
2023-2024
Showa University
2024
Osaka City University
1987-2022
Kindai University
2019-2022
Ishikiriseiki Hospital
2021
We describe and discuss the global properties of 45 gamma-ray bursts (GRBs) observed by HETE-2 during first 3 years its mission, focusing on X-ray flashes (XRFs) X-ray-rich GRBs (XRRs). find that numbers XRFs, XRRs, are comparable, durations sky distributions XRFs XRRs similar to those GRBs. also spectral GRBs, except values peak energy E burst spectrum in νFν, flux Fpeak, fluence SE much smaller (and smaller) than Finally, we all three kinds form a continuum [SE(2-30 keV), SE(30-400) keV]...
Abstract The Gas Slit Camera (GSC) is an X-ray instrument on the MAXI (Monitor of All-sky Image) mission aboard International Space Station. It designed to scan entire sky every 92-minute orbital period in 2–30 keV band and achieve highest sensitivity among all-sky monitors ever flown so far. GSC employs large-area position-sensitive proportional counters with a total detector area 5350 cm $^2$. on-board data processor has functions format telemetry as well control high voltage protect them...
We describe and discuss the global properties of 45 gamma-ray bursts (GRBs) observed by HETE-2 during first three years its mission, focusing on X-Ray Flashes (XRFs) X-ray-rich GRBs (XRRs). find that numbers XRFs, XRRs, are comparable. durations sky distributions XRFs XRRs similar to those GRBs. also spectral GRBs, except values peak energy $E^{\rm obs}_{\rm peak}$ burst spectrum in $νF_ν$, flux $\Fp$, fluence $S_E$ much smaller -- than Finally, we all kinds form a continuum [$S_E$(2-30...
Suzaku has, for the first time, enabled hard X-ray variability of Seyfert 1 galaxy MCG-6-30-15 to be measured. The in 14-45 keV band, which is dominated by a strong reflection hump, quenched relative that at few keV. This directly demonstrates whole spectrum much less variable than power-law continuum. broadband spectral can decomposed into two components - highly and constant as previously inferred from other observations 2-10 band. high iron abundance give rise broad line, requires inner...
We report High Energy Transient Explorer 2 (HETE-2) Wide Field X-Ray Monitor/French Gamma Telescope observations of the X-ray flash XRF 020903. This event was extremely soft: ratio log(SX/Sγ) = 0.7, where SX and Sγ are fluences in 2-30 30-400 keV energy bands, is most extreme value observed so far by HETE-2. In addition, spectrum has an peak E < 5.0 (99.7% probability upper limit), no photons were detected above ~10 keV. The burst shorter at higher energies, which similar to behavior long...
view Abstract Citations (212) References (49) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-Ray Spectral Variability and Complex Absorption in the Seyfert 1 Galaxies NGC 4051 MCG -6-30-15 Matsuoka, Masaru ; Piro, Luigi Yamauchi, Makoto Murakami, Toshio GINGA observations of galaxies -6-30- 15 have led to new exciting results. (1) Large-amplitude ( > 50%) variations been detected, down time scales 200 s, that confirm extend previous EXOSAT (2) These...
One of the most prominent, yet controversial associations derived from ensemble prompt-phase observations gamma-ray bursts (GRBs) is apparent correlation in source frame between peak energy (Epeak) νF(ν) spectrum and isotropic radiated energy, Eiso. Since GRBs have Epeak above range (15–150 keV) Burst Alert Telescope (BAT) on Swift, determining accurate values for large numbers Swift has been difficult. However, by combining data Swift/BAT Suzaku Wide-band All-Sky Monitor (WAM), which covers...
We report on a 100 ks Suzaku observation of the bright, nearby (z=0.008486) Seyfert 1.9 galaxy MCG -5-23-16. The broad-band (0.4-100 keV) X-ray spectrum allows us to determine nature high energy emission with little ambiguity. continuum consists cutoff power-law photon index $\Gamma=1.9$, absorbed through Compton-thin matter column density $N_{\rm H}=1.6\times10^{22}$ cm$^{-2}$. A soft excess is observed below 1 keV and likely combination from scattered photons distant photoionized gas. iron...
Abstract Various transient phenomena on a timescale ranging from seconds to days appear at unexpected sky positions in X-rays. MAXI, Monitor of All-sky X-ray Image, the International Space Station has been monitoring about 95% day and detected objects since 2009 August. Here, we describe quasi-real-time data processing systems MAXI subsequent nova-alert system find objects, present capabilities for detect events with excess fluxes ≳80 mCrab single scan transit ≳8 4 d, send prompt alert...
view Abstract Citations (90) References (15) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS New X-Ray Spectral Observations of NGC 4151 with ASCA Weaver, K. A. ; Yaqoob, T. Holt, S. Mushotzky, R. F. Matsuoka, M. Yamauchi, We present new X-ray spectral data for the well-studied Seyfert galaxy 4151, which was observed twice about 20 ks each during performance verification phase, once on 1993 May 25 and again November 5. The source underwent complex...
view Abstract Citations (117) References (18) Co-Reads Similar Papers Volume Content Graphics Metrics Export Citation NASA/ADS X-Ray Spectral Signatures of Very Thick Cold Matter in the Spectra Seyfert 1 Galaxies NGC 7469 and IC 4329A Piro, L. ; Yamauchi, M. Matsuoka, Observations with Ginga bright galaxies have revealed presence a hard X-ray bump above 8 keV. This new spectral component is probably produced by absorption or reflection central emission very thick (N_H_ > 10^24^ cm^- 2^) cold...
Context. As a result of the numerous missions dedicated to detection Gamma-ray bursts (GRBs), observed properties these events are now well known. However, studying their parameters in source frame is not simple since it requires having measurements both bursts' and distances.
Background: It has been suggested that there is a close association of abnormality in auricular muscles with various congenital deformities. However, no investigation to determine what are involved and how they affect the deformity. The authors examined abnormalities for patients Methods: 77 auricles 62 deformities, including cryptotia, Stahl's ear, prominent lop others. superior posterior from extrinsic muscle group oblique transverse intrinsic were investigated. Results: found...
The Soft X-ray Imager (SXI) is the charge-coupled device (CCD) camera for soft imaging telescope Xtend installed on Imaging and Spectroscopy Mission (XRISM), which was adopted as a recovery mission Hitomi satellite successfully launched 2023 September 7 (JST). In order to maximize science output of XRISM, we set requirements find that CCD employed in Hitomi/SXI or similar, i.e., $2 \times 2$ array back-illuminated CCDs with $200~\mu$m-thick depletion layer, would be practically best among...
Uterine adenosarcoma is a rare, low-grade malignant tumor that usually arises from the endometrium and presents as large polypoid mass occupying endometrial cavity. A correct histopathological diagnosis of small specimen often difficult, pre-operative MR imaging findings are generally not specific enough to establish an diagnosis. 60-year-old nulliparous woman was referred our hospital who presented with vaginal bleeding. Her medical history notable for type 2 diabetes mellitus hypertension....
Abstract The Soft X-ray Imager (SXI) is the charge-coupled device (CCD) camera for soft imaging telescope Xtend installed on Imaging and Spectroscopy Mission (XRISM), which was adopted as a recovery mission Hitomi satellite successfully launched 2023 September 7 (JST). In order to maximize science output of XRISM, we set requirements found that CCD employed in Hitomi/SXI or similar, i.e., $2 \times 2$ array back-illuminated CCDs with $200\, \mu$m-thick depletion layer, would be practically...