25 citations · 48 across the 4 of their papers we have counts for
4 papers
A relativistic two-stream instability in an extremely low-density plasma
Shinji Koide, Masaaki Takahashi, Rohta Takahashi
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 instabili…
Implications from the velocity profile of the M87 jet: a possibility of a slowly rotating black hole magnetosphere
Motoki Kino, Masaaki Takahashi, Tomohisa Kawashima +4
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 farthe…
Alfvénic superradiance for a monopole magnetosphere around a Kerr black hole
Sousuke Noda, Yasusada Nambu, Masaaki Takahashi +1
We explore superradiance for Alfvén waves (Alfvénic superradiance) in an axisymmetric rotating magnetosphere of a Kerr black hole within the force-free approximation. On the equato…
Standing Shocks in Trans-Magnetosonic Accretion Flows onto a Black Hole
M. Takahashi, J. Goto, K. Fukumura +2
Fast and slow magnetosonic shock formation is presented for stationary and axisymmetric magnetohydrodynamical (MHD) accretion flows onto a black hole. The shocked black hole accret…