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11 papers · 2 filters
Thermal Winds in Stellar Mass Black Hole and Neutron Star Binary Systems
Chris Done, Ryota Tomaru, Tad Takahashi
Black hole binaries show equatorial disc winds at high luminosities, which apparently disappear during the spectral transition to the low/hard state. This is also where the radio j…
Crossing the Eddington limit: examining disk spectra at high accretion rates
Andrew D. Sutton, Douglas A. Swartz, Timothy P. Roberts +3
The faintest ultraluminous X-ray sources (ULXs), those with 0.3-10 keV luminosities 1 < L_X/10^39 < 3 erg s^-1, tend to have X-ray spectra that are disk-like but broader than expec…
Revisiting the extremely fast disc wind in a gravitationally lensed quasar APM 08279+5255
Kouichi Hagino, Chris Done, Hirokazu Odaka +2
The gravitationally lensed quasar APM 08279+5255 has the fastest claimed wind from any AGN, with velocities of 0.6-0.7c, requiring magnetic acceleration as special relativisitic ef…
Energy spectra of X-ray quasi-periodic oscillations in the Lense-Thirring precession model
Piotr T. Zycki, Chris Done, Adam Ingram
We model the energy dependence of a quasi periodic oscillation (QPOs) produced by Lense-Thirring precession of a hot inner flow. We use a fully 3-dimensional Monte-Carlo code to co…
Reaching the Peak of the quasar spectral energy distribution - II. Exploring the accretion disc, dusty torus and host galaxy
James S. Collinson, Martin J. Ward, Hermine Landt +3
We continue our study of the spectral energy distributions (SEDs) of 11 AGN at 1.5 < z < 2.2, with optical-NIR spectra, X-ray data and mid-IR photometry. In a previous paper we pre…
Determining the torus covering factors for a sample of type 1 AGN in the local Universe
Savithri H. Ezhikode, Poshak Gandhi, Chris Done +4
In the unified scheme of active galactic nuclei, a dusty torus absorbs and then reprocesses a fraction of the intrinsic luminosity which is emitted at longer wavelengths. Thus, sub…