18 citations · 43 across the 3 of their papers we have counts for
5 papers
QPOs from Random X-ray Bursts around Rotating Black Holes
Keigo Fukumura, Demosthenes Kazanas, Gordon Stephenson
We continue our earlier studies of quasi-periodic oscillations (QPOs) in the power spectra of accreting, rapidly-rotating black holes that originate from the geometric "light echoe…
Light Echoes in Kerr Geometry: A Source of High Frequency QPOs from Random X-ray Bursts
Keigo Fukumura, Demosthenes Kazanas
We propose that high frequency quasi-periodic oscillations (HFQPOs) can be produced from randomly-formed X-ray bursts (flashes) by plasma interior to the ergosphere of a rapidly-ro…
Mass Outflows from Dissipative Shocks in Hot Accretion Flows
Keigo Fukumura, Demosthenes Kazanas
We consider stationary, axisymmetric hydrodynamic accretion flows in Kerr geometry. As a plausible means of efficiently separating a small population of nonthermal particles from t…
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…
Isothermal Shock Formation in Non-Equatorial Accretion Flows around Kerr Black Holes
Keigo Fukumura, Sachiko Tsuruta
We explore isothermal shock formation in non-equatorial, adiabatic accretion flows onto a rotating black hole, with possible application to some active galactic nuclei (AGNs). The…