James N. Imamura

TL;DR: In this paper, the authors present evidence that the quasi-periodic oscillations (QPO) and very low frequency noise (VLFN) characteristic of many accretion sources are different aspects of the same physical process.

TL;DR: An optical pulsar with frequency f = 1,968,629 Hz has been detected at the location of supernova 1987A in the LMC as mentioned in this paper, where the brightness of the pulsed light increased from magnitude 19 to 18 during a 7hr observation period starting on 18.1 January 1987 UT.

TL;DR: In this paper, the oscillatory instability of optically thin radiative shocks in time-dependent numerical calculations of accretion flows onto degenerate dwarfs was investigated, and the fundamental mode and the first overtone in the shock radius and luminosity variations can be clearly identified, and evidence is sometimes seen for the second overtone.

TL;DR: In this article, a 2.14 ms pulsar signal was detected with a complex period modulation near the frequency of 467.5 Hz in optical/near-infrared bands using various high-speed photometers.

TL;DR: In this article, the authors used the linear eigenfunctions to predict the early nonlinear behavior of the dynamic instability and compared these quasi-linear predictions with several fully nonlinear hydrodynamics simulations, and found a previously unsuspected resonance condition that accurately predicts the mass of the bar regions in their own simulations and in those published by other researchers.