4 papers
A narrow Comptonization locus in Seyfert slab coronae: implications for dominant coronal dissipation and reduced feedback
Haichao Xu
The thermal state of active galactic nucleus (AGN) coronae is commonly described by the electron temperature , the Thomson optical depth , and the geometry…
Photon Escape from Slab Thomson Media: A Scattering-order-resolved Recursive Formalism for Comptonization Applications
Haichao Xu
The scattering history of photons in slab media plays an important role in modelling Comptonized spectra and disc-corona radiative feedback. We develop a recursive formalism that e…
Unifying the X-ray coronae and ultra-fast outflows: a PBI-enhanced outflow-based corona model for the inner accretion disc
Haichao Xu
The fact that luminous X-ray coronae and Ultra-Fast Outflows (UFOs) are both inferred to originate from the innermost regions of active galactic nuclei (AGNs) suggests a deep physi…
Evolution of accretion disc-corona in the TDE Candidate AT 2019avd
Haichao Xu, Xinwu Cao, Yanan Wang +1
X-ray observations of the tidal disruption event (TDE) candidate AT 2019avd show drastic variabilities in flux and spectral shape over hundreds of days, providing clues on the accr…