Krang is a Julia (Bezanson et al., 2017) package that implements efficient algorithms for raytracing emission geometries in the Kerr black hole space time. It is GPU compatible and is specialized for studies of sub-image contributions from gravitationally lensed sources (Johnson et al., 2020)…
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Krang is a Julia (Bezanson et al., 2017) package that implements efficient algorithms for raytracing emission geometries in the Kerr black hole space time. It is GPU compatible and is specialized for studies of sub-image contributions from gravitationally lensed sources (Johnson et al., 2020)…
Download here
We propose a simple, analytic dual-cone accretion model for horizon scale images of the cores of Low-Luminosity Active Galactic Nuclei (LLAGN), including those observed by the Event Horizon Telescope (EHT). Our underlying model is of synchrotron emission from an axisymmetric …
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In April 2019, the Event Horizon Telescope (EHT) Collaboration reported the first-ever event-horizon-scale images of a black hole, resolving the central compact radio source in the giant elliptical galaxy M 87. These images reveal a ring with a southerly brightness …
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We investigate general relativistic magnetohydrodynamic simulations to determine the physical origin of the twisty patterns of linear polarization seen in spatially resolved black hole images…
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We develop a “dual-cone” model for millimeter wavelength emission near a spinning black hole. The model consists of optically thin, luminous cones of emission, centered on the spin axis, which are meant to represent jet walls…
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General relativity predicts that images of optically thin accretion flows around black holes should generically have a “photon ring”, composed of a series of increasingly sharp subrings that…
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The Event Horizon Telescope (EHT) has produced images of two supermassive black holes, Messier 87* (M87*) and Sagittarius A* (SgrA*). The EHT collaboration…
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Synchrotron radiation from hot gas near a black hole results in a polarized image. The image polarization is determined by effects including the orientation of the magnetic field in the emitting…
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