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An artist’s conception of a blazar, a galay powered by an active nucleus. Blazars are the most common sources detected by NASA’s Fermi gamma-ray spacecraft. Astronomers have modeled the bright, variable emission from the blazar CTA102 between 2013-2017 using data taken from the gamma-ray to radio bands. They are able to explain the multiuwavelegnth variability observed using a geometrical model for the rapidly moving jets. Credit: M. Weiss/CfA
Active galactic nuclei (AGN) are supermassive black holes at the centers of galaxies that are accreting material. These AGN emit jets of charged particles that move at speeds close to that of light, transporting huge amounts of energy away from the central black hole region and radiating across the electromagnetic spectrum...
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