We present global radiation GRMHD simulations of strongly magnetized accretion onto a
spinning, stellar mass black hole at sub-Eddington rates. Using a frequency-dependent …

We present X-ray spectral variability of 24 local active galactic nuclei (AGN) from the
Palomar sample of nearby galaxies, as observed mainly by Swift. From hardness ratio …

We present a new spectral-timing technique for phase-resolved spectroscopy and apply it to
the low-frequency Type B quasi-periodic oscillation (QPO) from the black hole X-ray binary …

Mass accretion rates in dimensionless and physical units, and efficiency factors describing
the total radiant luminosity of the disc and the beam power of the outflow are obtained and …

Black hole X-ray binaries in their hard and hard-intermediate states display hard and soft
time lags between broad-band noise variations (high-energy emission lagging low-energy …

We present Chandra X-ray Observatory observations and Space Telescope Imaging
Spectrograph spectra of NGC 5972, one of the 19 'Voorwerpjes' galaxies. This galaxy …

Aims. We analysed multi-epoch X-ray data of the ultraluminous X-ray source NGC 5055 X-1,
with luminosity up to 2.32× 10 40 erg s− 1, to constrain the physical parameters of the …

We present Chandra X-ray Observatory observations and Space Telescope Imaging
Spectrograph spectra of NGC 5972, one of the 19" Voorwerpjes" galaxies. This galaxy …

Regarding the correction of X‐ray beam hardening in the current CT imaging system, the
traditional method will cause the overlapping of images during use, which will gradually …

Gravity is one of the four fundamental forces of nature. We can understand gravity in the
weak-field limit, that is, in flat and weakly-curved spacetime, with Newtonian and post …