The Fermi team released its second catalogue of sources detected by the satellite’s Large Area Telescope (LAT) earlier this year.

“More than half of these sources are active galaxies, whose massive black holes are responsible for the gamma-ray emissions that the LAT detects,” said Gino Tosti, an astrophysicist at the University of Perugia in Italy and currently a visiting scientist at SLAC National Accelerator Laboratory in Menlo Park, Calif.

“What is perhaps the most intriguing aspect of our new catalogue is the large number of sources not associated with objects detected at any other wavelength,” he noted.

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