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X-ray Emissions from Three-dimensional Magnetohydrodynamic Coronal Accretion Flows
Norita Kawanaka, Yoshiaki Kato, Shin Mineshige
We calculate the radiation spectrum and its time variability of the black hole accretion disk-corona system based on the three-dimensional magnetohydrodynamic simulation. In explai…
Coronal Neutrino Emission in Hypercritical Accretion Flows
R. Kawabata, S. Mineshige, N. Kawanaka
Hypercritical accretion flows onto stellar mass black holes (BHs) are commonly considered as a promising model of central engines of gamma-ray bursts (GRBs). In this model a certai…
Neutrino Cooled Disk and Its Stability
Norita Kawanaka, Shin Mineshige
We investigate the structure and stability of hypercritical accretion flows around stellar-mass black holes, taking into account neutrino cooling, lepton conservation, and firstly…
Dead Zone Formation and Nonsteady Hyperaccretion in Collapsar Disks : A Possible Origin of Short-Term Variability in the Prompt Emission of Gamma-Ray Bursts
Youhei Masada, Norita Kawanaka, Takayoshi Sano +1
The central engine of gamma-ray bursts (GRBs) is believed to be a hot and dense disk with hyperaccretion onto a few solar-mass black hole. We investigate where the magnetorotationa…
Iron Fluorescent Line Emission from Black Hole Accretion Disks with Magnetic Reconnection-Heated Corona
N. Kawanaka, S. Mineshige, K. Iwasawa
We investigate the iron K fluorescent line produced by hard X-ray photons from magnetic reconnection-heated corona. The hot corona with temperature being about K can irrad…