Most of the gamma ray sources in this animation are blazars, supermassive black holes with relativistic jets pointed at Earth.
This is a static screen grab of the LAT repository User can double-click on a source to bring up more information. Image Credit: NASA/Goddard Space Flight Center.
The repository contains data for 1525 gamma-ray sources, but only variable ones. Astrophysicists are interested in variable sources because studying them has led to many important discoveries. Fermi and LAT helped find the, for example. “A high duty cycle and long-term monitoring of the gamma-ray sky has made the Fermi Large Area Telescope a pivotal tool in the study of time-domain and multimessenger astronomy,” the paper states.
The repository shows 10 years of observations, and there are likely more discoveries waiting to be uncovered in all that data. “Having the historical light curve database could lead to new multimessenger insights into past events,” said paper co-author Michela Negro, an astrophysicist at the University of Maryland and NASA’s Goddard Space Flight Center in Greenbelt, Maryland.
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