This GIF shows a representation of a gamma-ray flare from an active galaxy. Throughout the animation, circles appear that then expand like raindrops on water in varying sizes and shades of magenta. The smaller circles with lighter colors represent lower energy gamma rays, and the larger circles with darker colors are higher energy gamma rays. The animation starts with just a few of these drops across the image, with the density increasing and more large drops appearing in the center of the image toward the end, until the image is nearly filled with the expanding circles.
Credit: NASA/DOE/Fermi LAT Collaboration
Published: July 10, 2015

This visualization shows gamma rays detected during galaxy 3C 279's big flare by the Large Area Telescope (LAT) on NASA's Fermi Gamma-ray Space Telescope. The flare is an abrupt shower of "rain" that trails off toward the end of the movie. Gamma rays are represented as expanding circles reminiscent of raindrops on water. Both the maximum size of the circle and its color represent the energy of the gamma ray, with white lowest and magenta highest. The highest-energy gamma ray the LAT detected during this flare, 52 billion electron volts, arrives near the end. In a second version of the visualization, a background map shows how the LAT detects 3C 279 and other sources by accumulating high-energy photons over time (brighter squares reflect higher numbers of gamma rays). The movie starts on June 14, 2015, and ends June 17. The area shown is a region of the sky five degrees on a side and centered on the position of 3C 279.

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