Fermi Reveals the Most Extreme Blazars to Date
NASA’s Fermi Gamma-ray Space Telescope has identified the farthest gamma-ray blazars to date, a type of galaxy whose intense emissions are powered by supersized black…
Blazars
Radio Weak Blazars Challenge the Basic Explanation of Blazars
Using the Fermi catalog of very high energy sources and the WISE infrared sky catalog, astronomers have found two BL Lac blazars with no apparent…
NASA Telescopes Reveal a Surprising Blazar Connection
Using data from from NASA’s Wide-field Infrared Survey Explorer (WISE) and Fermi Gamma-ray Space Telescope, astronomers studying distant galaxies powered by monster black holes have…
Fermi Helps Link Cosmic Neutrino to Blazar Blast
Nearly 10 billion years ago, the black hole at the center of a galaxy known as PKS B1424-418 produced a powerful outburst. Light from this…
VERITAS Detects Gamma Rays from Distant Galaxy PKS 1441+25
Using the VERITAS array, astronomers have detected gamma rays from a blazar known as PKS 1441+25. The research shows that the source of the gamma…
Fermi Mission Reveals Hints of Gamma-Ray Cycle in Active Galaxy PG 1553+113
Using NASA’s Fermi Gamma-ray Space Telescope, a team of astronomers has discovered hints of periodic changes in brightness in blazar PG 1553+113, whose emissions are…
Fermi Views Blazar 3C 279’s Record Gamma-Ray Flare
NASA’s Fermi Gamma-ray Space Telescope and other satellites have recorded a record flare from a black hole at the center of the distant galaxy 3C…
Fermi Reveals Gamma-Ray Variability of Thirteen Blazars
Astronomers from the Harvard-Smithsonian Center for Astrophysics used Fermi to monitor the gamma-ray variability of thirteen blazars, finding evidence that the emission arises in several…
Fermi Reveals Distinctive Properties of Blazars
A team of astronomers has used Fermi data to reveal how blazars are distributed throughout the universe and to show the distinctive properties that define…
Astronomers Solve the Mystery of Where Gamma Rays Originate
An international team of astronomers has for the first time confirmed a link between the gamma bursts and their counterparts in several radio frequencies, solving…
Evolution of the EBL Over the Past 5 Billion Years Measured for the First Time
A new study details how researchers used data from blazars to measure the evolution of the EBL over the past five billion years for the…
Emission Spectrum from Blazar PKS 1424+240 Deviates from Expectations
Using data from the Hubble Space Telescope, researchers noticed that the emission spectrum from blazar PKS 1424+240 deviated from what was expected, possibly indicating something…
NASA’s Fermi Measures Extragalactic Background Light
Using data from NASA’s Fermi Gamma-ray Space Telescope, a team of astronomers have made the most accurate measurement of starlight in the universe and used…
New Data on Arp 220, The Best Evidence Yet for Microblazars
Scientists have been monitoring radio signals from the galaxy Arp 220, located 250 million light years from Earth, and now believe the radio emissions may…
Fermi Finds Celestial Sources of Photons, Some Unexplainable
NASA’s the Fermi Gamma-Ray Telescope has detected enough energetic photons to produce the first all-sky map of the very high energy universe. Since Fermi’s launch…