317 citations · 1.2k across the 32 of their papers we have counts for
8 papers · 1 filter
Multi-Frequency Models of Black Hole Photon Rings from Low-Luminosity Accretion Disks
Tejahni Desire, Alejandro Cárdenas-Avendaño, Andrew Chael
Images of black holes encode both astrophysical and gravitational properties. Detecting highly-lensed features in images can differentiate between these two effects. We present an…
On turbulence for spacetimes with stable trapping
Gabriele Benomio, Alejandro Cárdenas-Avendaño, Frans Pretorius +1
Motivated by understanding the nonlinear gravitational dynamics of spacetimes admitting stably trapped null geodesics, such as ultracompact objects and black string solutions to ge…
Morphology of Relativistically Broadened Line Emission from Axisymmetric Equatorial Accretion Disks
Delilah E. A. Gates, Chau Truong, Amrita Sahu +1
Single-frequency emission from an accretion disk around a black hole is broadened into a line profile due to gravitational redshift and the motion of the disk's particles relative…
Measuring Black Hole Light Echoes with Very Long Baseline Interferometry
George N. Wong, Lia Medeiros, Alejandro Cárdenas-Avendaño +1
Light passing near a black hole can follow multiple paths from an emission source to an observer due to strong gravitational lensing. Photons following different paths take differe…
The Black Hole Explorer: Motivation and Vision
Michael D. Johnson, Kazunori Akiyama, Rebecca Baturin +65
We present the Black Hole Explorer (BHEX), a mission that will produce the sharpest images in the history of astronomy by extending submillimeter Very-Long-Baseline Interferometry…
The Black Hole Explorer: Photon Ring Science, Detection and Shape Measurement
Alexandru Lupsasca, Alejandro Cárdenas-Avendaño, Daniel C. M. Palumbo +6
General relativity predicts that black hole images ought to display a bright, thin (and as-of-yet-unresolved) ring. This "photon ring" is produced by photons that explore the stron…
Explanation for the absence of secondary peaks in black hole light curve autocorrelations
Alejandro Cárdenas-Avendaño, Charles Gammie, Alexandru Lupsasca
The observed radiation from hot gas accreting onto a black hole depends on both the details of the flow and the spacetime geometry. The lensing behavior of a black hole produces a…
Assessing the impact of instrument noise and astrophysical fluctuations on measurements of the first black hole photon ring
Alejandro Cárdenas-Avendaño, Lennox Keeble, Alexandru Lupsasca
Currently envisioned extensions of the Event Horizon Telescope to space will soon target the black hole photon ring: a narrow ring-shaped imprint of a black hole's strong gravity p…