80 citations · 383 across the 14 of their papers we have counts for
14 papers
Time delays between radio and X-ray and between narrow radio bands of Sgr A* flares in the shock oscillation model
Toru Okuda, Chandra B. Singh, Ramiz Aktar
We examine the time delay between radio and X-ray and between narrow radio frequency flares in Sagittarius A* (Sgr A*), from analyses of the synchrotron, bremsstrahlung and monochr…
Radiative shock oscillation model for the long-term flares of Sgr A*
T. Okuda, C. B. Singh, R. Aktar
We examine time-dependent 2D relativistic radiation MHD flows to develop the shock oscillation model for the long-term flares of Sgr A*. Adopting modified flow parameters in additi…
Effects of resistivity on standing shocks in low angular momentum flows around black holes
Chandra B. Singh, Toru Okuda, Ramiz Aktar
We study two dimensional low angular momentum flow around the black hole using the resistive magnetohydrodynamic module of PLUTO code. Simulations have been performed for the flows…
Radiative Shocks around Super-Eddington Accreting Black Holes
Toru Okuda, Chandra B. Singh
We examine radiative standing shocks in advective accretion flows around stellar-mass black holes by 2D radiation hydrodynamic simulations, focusing on the super-Eddington accretin…
A Possible Model for the Long-Term Flares of Sgr A*
Toru Okuda, Chandra B. Singh, Santabrata Das +3
We examine the effects of magnetic field on low angular momentum flows with standing shock around black holes in two dimensions. The magnetic field brings change in behavior and lo…
Unstable mass-outflows in geometrically thick accretion flows around black holes
Toru Okuda, Santabrata Das
Accretion flows around black holes generally result in mass-outflows that exhibit irregular behavior quite often. Using 2D time-dependent hydrodynamical calculations, we show that…
Low angular momentum flow model II for Sgr A*
Toru Okuda
We examine 1D two-temperature accretion flows around a supermassive black hole, adopting the specific angular momentum λ, the total specific energy εand the input accretion rate \d…
Discovery of possible molecular counterparts to the infrared Double Helix Nebula in the Galactic center
R. Enokiya, K. Torii, M. Schultheis +23
We have discovered two molecular features at radial velocities of -35 km/s and 0 km/s toward the infrared Double Helix Nebula (DHN) in the Galactic center with NANTEN2. The two fea…
Low angular momentum flow model for Sgr A*
Toru Okuda, Diego Molteni
We examine the low angular momentum flow model for Sgr A* using two-dimensional hydrodynamical calculations based on the parameters of the specific angular momentum and total energ…
Star Forming Dense Cloud Cores in the TeV γ-ray SNR RX J1713.7-3946
H. Sano, J. Sato, H. Horachi +23
RX J1713.7-3946 is one of the TeV γ-ray supernova remnants (SNRs) emitting synchrotron X rays. The SNR is associated with molecular gas located at ~1 kpc. We made new molecular obs…
The Jets and Disc of SS 433 at Super-Eddington Luminosities
Toru Okuda, Galina V. Lipunova, Diego Molteni
We examine the jets and the disc of SS 433 at super-Eddington luminosities with 600 times Eddington critical accretion rate by time-dependent two-dimensional radiation hydrodynamic…
Black-Hole Accretion Discs and Jets at Super-Eddington Luminosity
T. Okuda, V. Teresi, E. Toscano +1
Super-Eddington accretion discs with 3 and 15 dot M_E around black holes with mass 10 M_sun are examined by two-dimensional radiation hydrodynamical calculations extending from the…
Radiative Shocks in Rotating Accretion Flows around Black Holes
T. Okuda, V. Teresi, E. Toscano +1
It is well known that the rotating inviscid accretion flows with adequate injection parameters around black holes could form shock waves close to the black holes, after the flow pa…
Super-Eddington Black-Hole Models for SS 433
Toru Okuda
We examine highly super-Eddington black-hole models for SS 433, based on two-dimensional hydrodynamical calculations coupled with radiation transport. The super-Eddington accretion…