Publications (9)
Black hole spin in GRS 1915+105
Matthew Middleton, Chris Done, Marek Gierlinski +1
Microquasars are galactic black hole binary systems with radio jets which can sometimes be spatially resolved to show superluminal motion. The first and best known of this class of…
Continuum emission from within the plunging region of black hole discs
Andrew Mummery, Adam Ingram, Shane Davis +1
The thermal continuum emission observed from accreting black holes across X-ray bands has the potential to be leveraged as a powerful probe of the mass and spin of the central blac…
Intrinsic disc emission and the Soft X-ray Excess in AGN
Chris Done, Shane Davis, Chichuan Jin +2
(Abridged) Narrow Line Seyfert 1 (NLS1) galaxies have low mass black holes and mass accretion rates close to (or exceeding) Eddington, so a standard blackbody accretion disc should…
On the Thermal Stability of Radiation Dominated Accretion Disks
Yan-Fei Jiang, James Stone, Shane Davis
We study the long-term thermal stability of radiation dominated disks in which the vertical structure is determined self-consistently by the balance of heating due to dissipation o…
A Novel Solution for Resonant Scattering Using Self-Consistent Boundary Conditions
B. Connor McClellan, Shane Davis, Phil Arras
We present two novel additions to the semi-analytic solution of Lyman (Ly) radiative transfer in spherical geometry: (1) implementation of the correct boundary condition f…
X-Ray Polarimetry with the Polarization Spectroscopic Telescope Array (PolSTAR)
Henric S. Krawczynski, Daniel Stern, Fiona A. Harrison +49
This paper describes the Polarization Spectroscopic Telescope Array (PolSTAR), a mission proposed to NASA's 2014 Small Explorer (SMEX) announcement of opportunity. PolSTAR measures…
A Comment on the Radiative Efficiency of AGN
Ari Laor, Shane Davis
A recent study of the accretion efficiency of the PG sample AGN, based on the thin accretion disk emission model, finds the accretion radiative efficiency is correlated with the bl…
Iron Opacity Bump Changes the Stability and Structure of Accretion Disks in Active Galactic Nuclei
Yan-Fei Jiang, Shane Davis, James Stone
Accretion disks around supermassive black holes have regions where the Rosseland mean opacity can be much larger than the electron scattering opacity primarily due to the large num…
The effects of irradiation on the cloud evolution in active galactic nuclei
Daniel Proga, Yan-Fei Jiang, James Stone +2
We report on the first phase of our study of cloud irradiation. We study irradiation by means of numerical, two-dimensional time-dependent radiation-hydrodynamic simulations of a c…