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23 papers · 2 filters
Local virial relation and velocity anisotropy in self-gravitating system
Y. Sota, O. Iguchi, M. Morikawa +1
We investigate the merging process in N-body self-gravitating system from the viewpoints of the local virial relation which is the relation between the local kinetic energy and the…
Local virial relation for self-gravitating system
Osamu Iguchi, Yasuhide Sota, Akika Nakamichi +1
We demonstrate that the quasi-equilibrium state in self-gravitating -body system after cold collapse are uniquely characterized by the local virial relation using numerical simu…
Observation of PeV Gamma Rays from the Monogem Ring with the Tibet Air Shower Array
The Tibet AS Gamma Collaboration, M. Amenomori
We searched for steady PeV gamma-ray emission from the Monogem ring region with the Tibet air shower array from 1997 February to 2004 October. No evidence for statistically signifi…
Toward Radiation-Magnetohydrodynamic Simulations in Core-Collapse Supernovae
Kei Kotake, Naofumi Ohnishi, Shoichi Yamada +1
We report a current status of our radiation-magnetohydrodynamic code for the study of core-collapse supernovae. In this contribution, we discuss the accuracy of our newly developed…
Are protons still dominant at the knee of the cosmic-ray energy spectrum?
The Tibet AS Gamma Collaboration, M. Amenomori
A hybrid experiment consisting of emulsion chambers, burst detectors and the Tibet II air-shower array was carried out at Yangbajing (4,300 m a.s.l., 606 g/cm) in Tibet to obta…
Non-Gaussianity of the density distribution in accelerating universes
Takayuki Tatekawa, Shuntaro Mizuno
According to recent observations, the existence of the dark energy has been considered. Even though we have obtained the constraint of the equation of the state for dark energy ($p…