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Pair Drizzle around Sub-Eddington Supermassive Black Holes
George N. Wong, Benjamin R. Ryan, Charles F. Gammie
Electron-positron pair creation near sub-Eddington accretion rate black holes is believed to be dominated by the Breit-Wheeler process (photon-photon collisions). The interacting h…
Gravitational Test Beyond the First Post-Newtonian Order with the Shadow of the M87 Black Hole
Dimitrios Psaltis, Lia Medeiros, Pierre Christian +185
The 2017 Event Horizon Telescope (EHT) observations of the central source in M87 have led to the first measurement of the size of a black-hole shadow. This observation offers a new…
Photon Ring Autocorrelations
Shahar Hadar, Michael D. Johnson, Alexandru Lupsasca +1
In the presence of a black hole, light sources connect to observers along multiple paths. As a result, observed brightness fluctuations must be correlated across different times an…
Monitoring the Morphology of M87* in 2009-2017 with the Event Horizon Telescope
Maciek Wielgus, Kazunori Akiyama, Lindy Blackburn +26
The Event Horizon Telescope (EHT) has recently delivered the first resolved images of M87*, the supermassive black hole in the center of the M87 galaxy. These images were produced…
Decomposing the Internal Faraday Rotation of Black Hole Accretion Flows
Angelo Ricarte, Ben S. Prather, George N. Wong +3
Faraday rotation has been seen at millimeter wavelengths in several low luminosity active galactic nuclei, including Event Horizon Telescope (EHT) targets M87* and Sgr A*. The obse…
Black Hole Glimmer Signatures of Mass, Spin, and Inclination
George N. Wong
Gravitational lensing near a black hole is strong enough that light rays can circle the event horizon multiple times. Photons emitted in multiple directions at a single event, perh…
Time-dependent heterogeneity leads to transient suppression of the COVID-19 epidemic, not herd immunity
Alexei V. Tkachenko, Sergei Maslov, Ahmed Elbanna +3
Epidemics generally spread through a succession of waves that reflect factors on multiple timescales. On short timescales, super-spreading events lead to burstiness and overdispers…
Feature Extraction on Synthetic Black Hole Images
Joshua Yao-Yu Lin, George N. Wong, Ben S. Prather +1
The Event Horizon Telescope (EHT) recently released the first horizon-scale images of the black hole in M87. Combined with other astronomical data, these images constrain the mass…
Modeling COVID-19 dynamics in Illinois under non-pharmaceutical interventions
George N. Wong, Zachary J. Weiner, Alexei V. Tkachenko +3
We present modeling of the COVID-19 epidemic in Illinois, USA, capturing the implementation of a Stay-at-Home order and scenarios for its eventual release. We use a non-Markovian a…
Bremsstrahlung in GRMHD models of accreting black holes
R. Yarza, G. N. Wong, B. R. Ryan +1
The role of bremsstrahlung in the emission from hot accretion flows around slowly accreting supermassive black holes is not thoroughly understood. In order to appraise the importan…
Discriminating Accretion States via Rotational Symmetry in Simulated Polarimetric Images of M87
Daniel C. M. Palumbo, George N. Wong, Ben S. Prather
In April 2017, the Event Horizon Telescope observed the shadow of the supermassive black hole at the core of the elliptical galaxy Messier 87. While the original image was construc…
SYMBA: An end-to-end VLBI synthetic data generation pipeline
F. Roelofs, M. Janssen, I. Natarajan +203
Realistic synthetic observations of theoretical source models are essential for our understanding of real observational data. In using synthetic data, one can verify the extent to…