Zobrazeno 1 - 10
of 1 105
pro vyhledávání: '"TAKAHASHI, Masaaki"'
Autor:
Saida, Hiromi, Matsui, Sena A., Takeuchi, Tsutomu T., Nishiyama, Shogo, Saitou, Rio, Takamori, Yohsuke, Takahashi, Masaaki
We have performed a parametrized post-Newtonian (PPN) test of a black hole spacetime using observational data of the star S0-2/S2 orbiting the massive black hole at our galactic center Sgr A*. After introducing our PPN model of black hole spacetime,
Externí odkaz:
http://arxiv.org/abs/2408.11284
Autor:
Kino, Motoki, Ro, Hyunwook, Takahashi, Masaaki, Kawashima, Tomohisa, Park, Jongho, Hada, Kazuhiro, Cui, Yuzhu
We study magnetic field strengths along the jet in NGC~315. First, we estimated the angular velocity of rotation in the jet magnetosphere by comparing the measured velocity profile of NGC~315 with the magneto-hydrodynamic jet model of proposed by Tom
Externí odkaz:
http://arxiv.org/abs/2407.18444
Autor:
Nishiyama, Shogo, Kara, Tomohiro, Thorsbro, Brian, Saida, Hiromi, Takamori, Yohsuke, Takahashi, Masaaki, Ohgami, Takayuki, Ichikawa, Kohei, Schödel, Rainer
The tremendous tidal force that is linked to the supermassive black hole (SMBH) at the center of our galaxy is expected to strongly subdue star formation in its vicinity. Stars within 1" from the SMBH thus likely formed further from the SMBH and migr
Externí odkaz:
http://arxiv.org/abs/2311.08869
A linear analysis based on two-fluid equations in the approximation of a cold plasma, wherein the plasma temperature is assumed to be zero, demonstrates that a two-stream instability occurs in all cases. However, if this were true, the drift motion o
Externí odkaz:
http://arxiv.org/abs/2305.16611
Autor:
Kino, Motoki, Takahashi, Masaaki, Kawashima, Tomohisa, Park, Jongho, Hada, Kazuhiro, Ro, Hyunwook, Cui, Yuzhu
Motivated by the measured velocity profile of the M87 jet using the KVN and VERA Array (KaVA) by Park et al. indicating that the starting position of the jet acceleration is farther from the central engine of the jet than predicted in general relativ
Externí odkaz:
http://arxiv.org/abs/2209.07264
Autor:
Kazahaya, Kohei, Morikawa, Noritoshi, Shinohara, Hiroshi, Togo, Yoko S., Takahashi, Hiroshi A., Takahashi, Masaaki, Sato, Tsutomu
Publikováno v:
In Chemical Geology 5 September 2024 661
Publikováno v:
Phys. Rev. D 105, 064018 (2022)
We explore superradiance for Alfv\'en waves (Alfv\'enic superradiance) in an axisymmetric rotating magnetosphere of a Kerr black hole within the force-free approximation. On the equatorial plane of the Kerr spacetime, the Alfv\'en wave equation is re
Externí odkaz:
http://arxiv.org/abs/2111.01149
We discuss stationary and axisymmetric trans-magnetosonic outflows in the magnetosphere of a rotating black hole (BH). Ejected plasma from the plasma source located near the BH is accelerated far away to form a relativistic jet. In this study, the pl
Externí odkaz:
http://arxiv.org/abs/2109.05868
We performed one-dimensional force-free magnetodynamic numerical simulations of the propagation of Alfven waves along magnetic field lines around a spinning black-hole-like object, the Banados--Teitelboim--Zanelli black string, to investigate the dyn
Externí odkaz:
http://arxiv.org/abs/2109.05703
Publikováno v:
In Icarus 15 March 2024 411