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The Black Hole Explorer: Using the Photon Ring to Visualize Spacetime Around the Black Hole
Peter Galison, Michael D. Johnson, Alexandru Lupsasca +2
The Black Hole Explorer (BHEX), an orbiting, multi-band, millimeter radio-telescope, in hybrid combination with millimeter terrestrial radio-telescopes, is designed to discover and…
Constraints on black-hole charges with the 2017 EHT observations of M87*
Prashant Kocherlakota, Luciano Rezzolla, Heino Falcke +234
Our understanding of strong gravity near supermassive compact objects has recently improved thanks to the measurements made by the Event Horizon Telescope (EHT). We use here the M8…
Polarized Image of Equatorial Emission in the Kerr Geometry
Zachary Gelles, Elizabeth Himwich, Daniel C. M. Palumbo +1
We develop a simple toy model for polarized images of synchrotron emission from an equatorial source around a Kerr black hole by using a semi-analytic solution of the null geodesic…
Light echos and coherent autocorrelations in a black hole spacetime
Paul M. Chesler, Lindy Blackburn, Sheperd S. Doeleman +4
The Event Horizon Telescope recently produced the first images of a black hole. These images were synthesized by measuring the coherent correlation function of the complex electric…
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…
Universal Polarimetric Signatures of the Black Hole Photon Ring
Elizabeth Himwich, Michael D. Johnson, Alexandru Lupsasca +1
Black hole images present an annular region of enhanced brightness. In the absence of propagation effects, this "photon ring" has universal features that are completely governed by…