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Resolving different sources of fast X-ray variability of the dwarf nova RU Peg in quiescence
A. Dobrotka, S. Mineshige, J. -U. Ness
We analysed an X-ray light curve of the dwarf nova RU Peg taken by XMM-Newton with a duration of 46300 s. The power density spectrum has a complicated shape with two red noise and…
Inner Disc Obscuration in GRS 1915+105 Based on Relativistic Slim Disc Model
K. Vierdayanti, A. Sadowski, S. Mineshige +1
We study the observational signatures of the relativistic slim disc of 10 M_sun black hole, in a wide range of mass accretion rate, mdot, dimensionless spin parameter, a_ast, and v…
The Discovery of a New Instability in a Hyperaccretion Flow and its Implication for Gamma-ray Bursts
Norita Kawanaka, Shin Mineshige, Tsvi Piran
A hyperaccretion flow around a stellar mass black hole is thought to be the most plausible engine that powers gamma-ray bursts (GRBs). The flow efficiently cools via neutrino emiss…
Clumpy Outflow from Supercritical Accretion Flows
S. Takeuchi, K. Ohsuga, S. Mineshige
Significant fraction of matter in supercritical (or super-Eddington) accretion flow is blown away by radiation force, thus forming outflows, however, the properties of such radiati…
Rapid Spectral Changes of Cygnus X-1 in the Low/Hard State with Suzaku
S. Yamada, H. Negoro, S. Torii +3
Rapid spectral changes in the hard X-ray on a time scale down to ~0.1 s are studied by applying "shot analysis" technique to the Suzaku observations of the black hole binary Cygnus…
Highly Ionized Fe-K Absorption Line from Cygnus X-1 in the High/Soft State Observed with Suzaku
S. Yamada, S. Torii, S. Mineshige +7
We present observations of a transient He-like Fe K alpha absorption line in Suzaku observations of the black hole binary Cygnus X-1 on 2011 October 5 near superior conjunction dur…