683 citations · 955 across the 15 of their papers we have counts for
8 papers · 1 filter
A Convolutional Neural Network for the Recovery of Transfer Functions From Velocity-Resolved Reverberation Mapping Data
Kirk Long, Keith Horne, Jason Dexter +1
One of the hallmarks of active galactic nuclei are that they are highly variable with time. In watching the spectra vary it has been observed that the emission-lines often appear t…
Demystifying flux eruptions: Magnetic flux transport in magnetically arrested disks
Jonatan Jacquemin-Ide, Mitchell C. Begelman, Beverly Lowell +3
Magnetically arrested disks (MADs) are a compelling model for explaining variability in low-luminosity active galactic nuclei (AGN), including horizon-scale outbursts like those ob…
Reverberation Mapping Data of NGC 5548 Imply a Multicomponent Broad-Line Region
Kirk Long, Jason Dexter
Line broadening and variability are observational hallmarks of active galactic nuclei which allow us to measure supermassive black hole masses as well as constrain the geometry and…
Little Red Dots As Late-stage Quasi-stars
Mitchell C. Begelman, Jason Dexter
We argue that the "Little Red Dots" (LRDs) discovered with the James Webb Space Telescope are quasi-stars in their late stages of evolution. Quasi-stars are hypothetical objects pr…
The Impact of Plasma Angular Momentum on Magnetically Arrested Flows and Relativistic Jets in Hot Accretion Flows Around Black Holes
Ho-Sang Chan, Prasun Dhang, Jason Dexter +1
In certain scenarios, the accreted angular momentum of plasma onto a black hole could be low; however, how the accretion dynamics depend on the angular momentum content of the plas…
Polarimetric Signatures of Bulk Comptonization from within the Plunging Region of Accreting Black Holes
Ho-Sang Chan, Mitchell C. Begelman, Jason Dexter
Inverse Compton scattering by the thermal motions of electrons is believed to produce polarized hard X-rays in active galactic nuclei and black-hole binaries. Meanwhile, plasma wit…
Revealing the Accretion Flow in M87*: Insights from Faraday Rotation
Constanza Echiburú-Trujillo, Jason Dexter
The Faraday rotation measure (RM) is a commonly used tool to trace electron number density and magnetic fields in hot accretion flows, particularly in low-luminosity accreting supe…
The inner structure and thermodynamics of a thin accretion disc
A. Hankla, J. Dexter, N. Scepi
Using three-dimensional general relativistic magnetohydrodynamic simulations with electron and proton thermodynamics and an electron cooling function, we probe the inner radial and…