226 citations · 506 across the 20 of their papers we have counts for
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Black Hole Polarimetry: Universal Polarization of Synchrotron Radiation at the Horizon
Andrew Chael, Alexandru Lupsasca, George N. Wong +2
Polarized images of a black hole encode the direction of electromagnetic energy flow near its event horizon. Measuring polarization from near-horizon emission can help determine wh…
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…
Black Hole Polarimetry II: The Connection Between Spin and Polarization
George N. Wong, Andrew Chael, Alexandru Lupsasca +1
We study synchrotron polarization in spatially resolved horizon-scale images, such as those produced by the Event Horizon Telescope (EHT). In both general relativistic magnetohydro…
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…
Photon Ring Interferometric Signatures Beyond The Universal Regime
He Jia, Eliot Quataert, Alexandru Lupsasca +1
We calculate the interferometric signatures of black hole photon rings beyond the universal regime by perturbatively including the effects of finite ring width. Our approach first…
Black Hole Polarimetry I: A Signature of Electromagnetic Energy Extraction
Andrew Chael, Alexandru Lupsasca, George N. Wong +1
In 1977, Blandford and Znajek showed that the electromagnetic field surrounding a rotating black hole can harvest its spin energy and use it to power a collimated astrophysical jet…