10.9k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- The University of TokyoJP1.8k papers
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25 papers · 2 filters
Accretion geometry of the black-hole binary Cygnus X-1 from X-ray polarimetry
M. Chauvin, H. -G. Florén, M. Friis +13
Black-hole binary (BHB) systems comprise a stellar-mass black hole and a closely orbiting companion star. Matter is transferred from the companion to the black hole, forming an acc…
Comparing treatments of weak reactions with nuclei in simulations of core-collapse supernovae
Hiroki Nagakura, Shun Furusawa, Hajime Togashi +3
We perform an extensive study of the influence of nuclear weak interactions on core-collapse supernovae (CCSNe), paying particular attention to consistency between nuclear abundanc…
Detection of a gamma-ray flare from the high-redshift blazar DA 193
Vaidehi S. Paliya, M. Ajello, R. Ojha +10
High-redshift () blazars are the most powerful members of the blazar family. Yet, only a handful of them have both X-ray and -ray detection, thereby making it difficult to…
The Evolution towards Electron-capture Supernovae: the Flame Propagation and the Pre-bounce Electron-neutrino Radiation
K. Takahashi, K. Sumiyoshi, S. Yamada +2
A critical mass ONe core with a high ignition density is considered to end in gravitational collapse leading to neutron star formation. Being distinct from a Fe core collapse, the…
PoGO+ polarimetric constraint on the synchrotron jet emission of Cygnus X-1
Maxime Chauvin, Hans-Gustav Florén, Miranda Jackson +8
We report a polarimetric constraint on the hard X-ray synchrotron jet emission from the Cygnus X-1 black-hole binary system. The observational data were obtained using the PoGO+ ha…
On the importance of progenitor asymmetry to shock revival in core-collapse supernovae
Hiroki Nagakura, Kazuya Takahashi, Yu Yamamoto
The progenitor stars of core-collapse supernovae (CCSNe) are asymmetrically fluctuating due to turbulent convections in the late stages of their lives. The progenitor asymmetry at…
Testing a reported correlation between arrival directions of ultrahigh-energy cosmic rays and a flux pattern from nearby starburst galaxies using Telescope Array data
Telescope Array Collaboration, R. U. Abbasi, M. Abe +138
The Pierre Auger Collaboration (Auger) recently reported a correlation between the arrival directions of cosmic rays with energies above 39 EeV and the flux pattern of 23 nearby st…
On the Neutrino Distributions in Phase Space for the Rotating Core-collapse Supernova Simulated with a Boltzmann-neutrino-radiation-hydrodynamics Code
Akira Harada, Hiroki Nagakura, Wakana Iwakami +5
With the Boltzmann-radiation-hydrodynamics code, which we have developed to solve numerically the Boltzmann equations for neutrino transfer, the Newtonian hydrodynamics equations,…
Detection of polarized gamma-ray emission from the Crab nebula with Hitomi Soft Gamma-ray Detector
Hitomi Collaboration, Felix Aharonian, Hiroki Akamatsu +191
We present the results from the Hitomi Soft Gamma-ray Detector (SGD) observation of the Crab nebula. The main part of SGD is a Compton camera, which in addition to being a spectrom…
Effects of rotation and magnetic field on the revival of a stalled shock in supernova explosions
Kotaro Fujisawa, Hirotada Okawa, Yu Yamamoto +1
We investigate axisymmetric steady solutions of (magneto)hydrodynamics equations that describe approximately accretion flows through a standing shock wave and discuss the effects o…
Mass composition of ultra-high-energy cosmic rays with the Telescope Array Surface Detector Data
Telescope Array Collaboration, R. U. Abbasi, M. Abe +139
The results on ultra-high-energy cosmic rays (UHECR) mass composition obtained with the Telescope Array surface detector are presented. The analysis employs the boosted decision tr…
Possible GeV counterpart at the ground level associated with Fermi LAT gamma-ray bursts
C. R. A. Augusto, C. E. Navia, M. N. de Oliveira +3
From June 2014 to February 2017, the Fermi LAT detected 46 gamma-ray bursts (GRBs) with photon energies above 20 MeV, and the trigger coordinates of seven of them were within the F…
Search for GeV Gamma-ray Counterparts of Gravitational Wave Events by CALET
O. Adriani, Y. Akaike, K. Asano +88
We present results on searches for gamma-ray counterparts of the LIGO/Virgo gravitational-wave events using CALorimetric Electron Telescope ({\sl CALET}) observations. The main ins…
Determining the stiffness of the equation of state using low T/W dynamical instabilities in differentially rotating stars
Motoyuki Saijo
We investigate the nature of low T/W dynamical instabilities in various ranges of the stiffness of the equation of state in differentially rotating stars. Here T is the rotational…
Extended Measurement of the Cosmic-Ray Electron and Positron Spectrum from 11 GeV to 4.8 TeV with the Calorimetric Electron Telescope on the International Space Station
O. Adriani, Y. Akaike, K. Asano +88
Extended results on the cosmic-ray electron + positron spectrum from 11 GeV to 4.8 TeV are presented based on observations with the Calorimetric Electron Telescope (CALET) on the I…
Influence of Earth-Directed Coronal Mass Ejections on the Sun's Shadow Observed by the Tibet-III Air Shower Array
M. Amenomori, X. J. Bi, D. Chen +78
We examine the possible influence of Earth-directed coronal mass ejections (ECMEs) on the Sun's shadow in the 3~TeV cosmic-ray intensity observed by the Tibet-III air shower (AS) a…
The origins of the gamma-ray flux variations of NGC 1275 based on 8 years of Fermi-LAT observations
K. Tanada, J. Kataoka, M. Arimoto +4
We present an analysis of 8 years of Fermi-LAT ( > 0.1 GeV) gamma-ray data obtained for the radio galaxy NGC 1275. The gamma-ray flux from NGC 1275 is highly variable on short (~ d…
Study of muons from ultra-high energy cosmic ray air showers measured with the Telescope Array experiment
Telescope Array Collaboration, R. U. Abbasi, M. Abe +138
One of the uncertainties in interpretation of ultra-high energy cosmic ray (UHECR) data comes from the hadronic interaction models used for air shower Monte Carlo (MC) simulations.…
The Cosmic-Ray Energy Spectrum between 2 PeV and 2 EeV Observed with the TALE detector in monocular mode
R. U. Abbasi, M. Abe, T. Abu-Zayyad +137
We report on a measurement of the cosmic ray energy spectrum by the Telescope Array Low-Energy Extension (TALE) air fluorescence detector. The TALE air fluorescence detector is als…
Comprehensive study of ejecta-companion interaction for core-collapse supernovae in massive binaries
Ryosuke Hirai, Philipp Podsiadlowski, Shoichi Yamada
We carry out a comprehensive study of supernova ejecta-companion interaction in massive binary systems. We aim to physically understand the kinematics of the interaction and predic…
The PoGO+ view on Crab off-pulse hard X-ray polarisation
M. Chauvin, H. -G. Florén, M. Friis +11
The linear polarisation fraction and angle of the hard X-ray emission from the Crab provide unique insight into high energy radiation mechanisms, complementing the usual imaging, t…
X-ray and Gamma-ray Observations of the Fermi Bubbles and NPS/Loop I Structures
Jun Kataoka, Yoshiaki Sofue, Yoshiyuki Inoue +3
The Fermi bubbles were possibly created by large injections of energy into the Galactic Center (GC), either by an active galactic nucleus (AGN) or by nuclear starburst more than ~1…
Evidence of Intermediate-Scale Energy Spectrum Anisotropy of Cosmic Rays E10 eV with the Telescope Array Surface Detector
R. U. Abbasi, M. Abe, T. Abu-Zayyad +136
An intermediate-scale energy spectrum anisotropy has been found in the arrival directions of ultra-high energy cosmic rays of energies above eV in the northern hemisphe…
Hitomi X-ray Observation of the Pulsar Wind Nebula G21.50.9
Hitomi Collaboration, Felix Aharonian, Hiroki Akamatsu +194
We present results from the Hitomi X-ray observation of a young composite-type supernova remnant (SNR) G21.50.9, whose emission is dominated by the pulsar wind nebula (PWN) cont…