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The Event Horizon Telescope (EHT) enables the exploration of black hole accretion flows at event-horizon scales. Fitting ray-traced physical models to EHT observations requires the generation of synthetic images, a task that is…

High Energy Astrophysical Phenomena · Physics 2025-04-29 Ali SaraerToosi , Avery Broderick

Using very long baseline interferometry, the Event Horizon Telescope (EHT) collaboration has resolved the shadows of two supermassive black holes. Model comparison is traditionally performed in image space, where imaging algorithms…

The Event Horizon Telescope (EHT) has produced images of the plasma flow around the supermassive black holes in Sgr A* and M87* with a resolution comparable to the projected size of their event horizons. Observations with the…

High Energy Astrophysical Phenomena · Physics 2023-03-15 Andrew Chael , Sara Issaoun , Dominic W. Pesce , Michael D. Johnson , Angelo Ricarte , Christian M. Fromm , Yosuke Mizuno

The Event Horizon Telescope (EHT) provides a unique opportunity to probe the physics of supermassive black holes through Very Large Baseline Interferometry (VLBI), such as the existence of the event horizon, the accretion processes as well…

High Energy Astrophysical Phenomena · Physics 2018-12-12 Bidisha Bandyopadhyay , Dominik R. G. Schleicher , Neil Nagar , Fu-Guo Xie , Venkatessh Ramakrishnan

The Event Horizon Telescope (EHT), a global sub-millimeter wavelength very long baseline interferometry array, is now resolving the innermost regions around the supermassive black holes Sgr A* and M87. Using black hole images from both…

High Energy Astrophysical Phenomena · Physics 2015-06-23 Angelo Ricarte , Jason Dexter

(abridged) In a series of publications, we describe a comprehensive comparison of Event Horizon Telescope (EHT) data with theoretical models of Sgr A* and M87*. Here, we report on improvements made to our observational data reduction…

Instrumentation and Methods for Astrophysics · Physics 2025-06-18 M. Janssen , C. -k. Chan , J. Davelaar , I. Natarajan , H. Olivares , B. Ripperda , J. Röder , M. Rynge , M. Wielgus

Submillimeter interferometry has the potential to image supermassive black holes on event horizon scales, providing tests of the theory of general relativity and increasing our understanding of black hole accretion processes. The Event…

The observation of the shadow of the supermassive black hole M87$^{*}$ by the Event Horizon Telescope (EHT) is sensitive to the spacetime geometry near the circular photon orbit and beyond, and it thus has the potential to test general…

General Relativity and Quantum Cosmology · Physics 2022-09-19 Guillermo Lara , Sebastian H. Völkel , Enrico Barausse

The Event Horizon Telescope (EHT) has imaged the shadow of the supermassive black hole in M87. A library of general relativistic magnetohydrodynamics (GMRHD) models was fit to the observational data, providing constraints on black hole…

High Energy Astrophysical Phenomena · Physics 2021-06-09 Freek Roelofs , Christian M. Fromm , Yosuke Mizuno , Jordy Davelaar , Michael Janssen , Ziri Younsi , Luciano Rezzolla , Heino Falcke

The Event Horizon Telescope (EHT) Collaboration has successfully produced images of two supermassive black holes, enabling novel tests of black holes and their accretion flows on horizon scales. The EHT has so far published total intensity…

High Energy Astrophysical Phenomena · Physics 2022-12-27 Angelo Ricarte , Michael D. Johnson , Yuri Y. Kovalev , Daniel C. M. Palumbo , Razieh Emami

The Event Horizon Telescope (EHT), a global very long baseline interferometry array operating at millimetre wavelengths, is spatially resolving the immediate environments of black holes for the first time. The current observations of the…

High Energy Astrophysical Phenomena · Physics 2015-06-16 Ayman Bin Kamruddin , Jason Dexter

(abridged) In the first two papers of this publication series, we present a comprehensive library of synthetic EHT observations and used this library to train and validate Bayesian neural networks for the parameter inference of accreting…

High Energy Astrophysical Phenomena · Physics 2025-06-18 M. Janssen , C. -k. Chan , J. Davelaar , M. Wielgus

The Event Horizon Telescope (EHT) has recently released high-resolution images of accretion flows onto two supermassive black holes. Our physical understanding of these images depends on accuracy and precision of numerical models of plasma…

Instrumentation and Methods for Astrophysics · Physics 2023-03-08 Monika Moscibrodzka , Aristomenis Yfantis

We introduce a new library of 535,194 model images of the supermassive black holes and Event Horizon Telescope (EHT) targets Sgr A* and M87*, computed by performing general relativistic radiative transfer calculations on general…

High Energy Astrophysical Phenomena · Physics 2023-02-22 Richard Qiu , Angelo Ricarte , Ramesh Narayan , George N. Wong , Andrew Chael , Daniel Palumbo

The capability of the Event Horizon Telescope (EHT) to image the nearest supermassive black hole candidates at horizon-scale resolutions offers a novel means to study gravity in its strongest regimes and to test different models for these…

Interferometers, such as the Event Horizon Telescope (EHT), do not directly observe the images of sources but rather measure their Fourier components at discrete spatial frequencies up to a maximum value set by the longest baseline in the…

High Energy Astrophysical Phenomena · Physics 2020-04-15 Dimitrios Psaltis , Lia Medeiros , Tod R. Lauer , Chi-Kwan Chan , Feryal Ozel

The recent advent of the Event Horizon Telescope (EHT) has made direct imaging of supermassive black holes a reality. Simulated images of black holes produced via general relativistic ray tracing and radiative transfer provide a key…

High Energy Astrophysical Phenomena · Physics 2021-05-13 Z. Gelles , B. S. Prather , D. C. M. Palumbo , M. D. Johnson , G. N. Wong , B. Georgiev

Originally developed to image the shadow region of the central black hole in Sagittarius A* and in the nearby galaxy M87, the Event Horizon Telescope (EHT) provides deep, very high angular resolution data on other AGN sources too. The…

Horizon-scale imaging with the Event Horizon Telescope (EHT) has provided transformative insights into supermassive black holes but its resolution and scope are limited by ground-based constraints such as the size of the Earth, its…

Instrumentation and Methods for Astrophysics · Physics 2024-12-04 Yassine Ben Zineb , Feryal Ozel , Dimitrios Psaltis

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 and spin of the hole as well as the accretion rate and…

High Energy Astrophysical Phenomena · Physics 2020-07-03 Joshua Yao-Yu Lin , George N. Wong , Ben S. Prather , Charles F. Gammie
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