10.9k citations
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11 papers · 2 filters
On a role of corotation radius in the low dynamical instability of differentially rotating stars
Shin'ichirou Yoshida, Motoyuki Saijo
We investigate the nature of so-called low dynamical instability in a differentially rotating star by focusing on the role played by the corotation radius of the unstable osc…
The intermediate r-process in core-collapse supernovae driven by the magneto-rotational instability
Nobuya Nishimura, Hidetomo Sawai, Tomoya Takiwaki +2
We investigated r-process nucleosynthesis in magneto-rotational supernovae, based on a new explosion mechanism induced by the magneto-rotational instability. A series of axisymmetr…
High-Energy Non-Thermal and Thermal Emission from GRB141207A detected by Fermi
Makoto Arimoto, Katsuaki Asano, Masanori Ohno +5
The bright long gamma-ray burst GRB 141207A was observed by the {\it Fermi Gamma-ray Space Telescope} and detected by both instruments onboard. The observations show that the spect…
Rotational equilibria by Lagrangian variational principle: toward multi-dimensional stellar evolutions
Nobutoshi Yasutake, Kotaro Fujisawa, Shoichi Yamada
We have developed a new formulation to obtain self-gravitating, axisymmetric configurations in permanent rotation. The formulation is based on the Lagrangian variational principle…
Hitomi constraints on the 3.5 keV line in the Perseus galaxy cluster
Hitomi Collaboration, Felix A. Aharonian, Hiroki Akamatsu +215
High-resolution X-ray spectroscopy with Hitomi was expected to resolve the origin of the faint unidentified E=3.5 keV emission line reported in several low-resolution studies of va…
CALET Upper Limits on X-ray and Gamma-ray Counterparts of GW 151226
O. Adriani, Y. Akaike, K. Asano +89
We present upper limits in the hard X-ray and gamma-ray bands at the time of the LIGO gravitational-wave event GW 151226 derived from the CALorimetric Electron Telescope (CALET) ob…
Inverse Compton X-ray Emissions from TeV blazar Mrk421 during a Historical Low-Flux State Observed with NuSTAR
Jun Kataoka, Lukasz Stawarz
We report on the detection of excess hard X-ray emission from the TeV BL Lac object Mrk421 during the historical low-flux state of the source in January 2013. NuSTAR observations w…
Circular polarizations of gravitational waves from core-collapse supernovae: a clear indication of rapid rotation
Kazuhiro Hayama, Takami Kuroda, Ko Nakamura +1
We propose to employ the circular polarization of gravitational waves emitted by core-collapse supernovae as an unequivocal indication of rapid rotation deep in their cores. It has…
Three-dimensional Boltzmann-Hydro code for core-collapse in massive stars II. The Implementation of moving-mesh for neutron star kicks
Hiroki Nagakura, Wakana Iwakami, Shun Furusawa +4
We present a newly developed moving-mesh technique for the multi-dimensional Boltzmann-Hydro code for the simulation of core-collapse supernovae (CCSNe). What makes this technique…
Links between the shock instability in core-collapse supernovae and asymmetric accretions of envelopes
Kazuya Takahashi, Wakana Iwakami, Yu Yamamoto +1
The explosion mechanism of core-collapse supernovae has not been fully understood yet but multi-dimensional fluid instabilities such as standing accretion shock instability (SASI)…
Multi-messenger signals of long-term core-collapse supernova simulations : synergetic observation strategies
Ko Nakamura, Shunsaku Horiuchi, Masaomi Tanaka +3
The next Galactic supernova is expected to bring great opportunities for the direct detection of gravitational waves (GW), full flavor neutrinos, and multi-wavelength photons. To m…