Orbital Polarimetric Tomography of a Flare Near the Sagittarius A* Supermassive Black Hole

no code implementations • 11 Oct 2023 • Aviad Levis, Andrew A. Chael, Katherine L. Bouman, Maciek Wielgus, Pratul P. Srinivasan

One proposed mechanism that produces flares is the formation of compact, bright regions that appear within the accretion disk and close to the event horizon.

3D Reconstruction

Light echos and coherent autocorrelations in a black hole spacetime

no code implementations • 22 Dec 2020 • Paul M. Chesler, Lindy Blackburn, Sheperd S. Doeleman, Michael D. Johnson, James M. Moran, Ramesh Narayan, Maciek Wielgus

We explore the coherent temporal autocorrelation function measured at a single telescope.

General Relativity and Quantum Cosmology High Energy Astrophysical Phenomena

Elliptical accretion disk as a model for tidal disruption events

no code implementations • 10 Dec 2020 • Fukun Liu, Chunyang Cao, Marek A. Abramowicz, Maciek Wielgus, Rong Cao, Zhiqin Zhou

Elliptical accretion disks predict sub-Eddington luminosities and emit mainly at the photon-trapping radius of thousands of Schwarzschild radii with a blackbody spectrum of nearly single temperature of typically about 3X10^4 K. Because of the self-regulation, the photon-trapping radius expands and contracts following the rise and fall of accretion rate.

High Energy Astrophysical Phenomena General Relativity and Quantum Cosmology