6 papers
Approximating the Fourier Transform of Ring-Like Images: the Focal Expansion
Filip NiewiÅski, Michael D. Johnson
We derive and showcase a novel approach to approximating Fourier transforms in higher dimensions, focusing specifically on the case of 2D radially concentrated ('ring-like') functi…
Multifrequency Synthesis via CHIBI: Colorful Hierarchical Interferometric Bayesian Imaging
Erandi Chavez, Paul Tiede, Sara Issaoun +4
From magnetized plasma of relativistic jets to dust grains within protoplanetary disks, we study the emission mechanisms of radio sources via their rich spectral structure. Multifr…
Locating the missing large-scale emission in the jet of M87* with short EHT baselines
Boris Georgiev, Paul Tiede, Sebastiano D. von Fellenberg +280
In Very-Long Baseline Interferometric arrays, nearly co-located stations probe the largest scales and typically cannot resolve the observed source. In the absence of large-scale st…
The Role of Interferometric Phase in Measuring Black Hole Photon Rings
Sol Gutiérrez-Lara, Daniel C. M. Palumbo, Michael D. Johnson
The Event Horizon Telescope (EHT) captured the first images of a black hole using Very Long Baseline Interferometry (VLBI). In the near future, extensions of the EHT such as the Bl…
Interferometric inference of black hole spin from photon ring size and brightness
Joseph R. Farah, Alexandru Lupsasca, Eliot Quataert +1
The photon ring is a full image of the astrophysical source around a black hole, produced by photons that execute half-orbit around the event horizon on their way…
The First 4 Years of SN 1993J Revisited: Geometric -ring Modeling of the Radio Shell with Closure Quantities Only
Joseph R. Farah, Logan J. Prust, Giacomo Terreran +5
SN 1993J is the best-studied radio supernova, with observations using very-long-baseline interferometry (VLBI) spanning from within weeks of explosion through nearly three decades…