Facts about Blazars
- 08
Accretion disks around supermassive black holes in blazars can reach temperatures exceeding 100 million Kelvin, emitting intense ultraviolet and X-ray radiation that competes with relativistic jet emissions.
- 07
Blazars constitute only about 10 percent of active galactic nuclei but dominate the gamma-ray sky, representing roughly half of all sources detected by Fermi at energies above 100 megaelectronvolts.
- 06
Opposite jets in blazars can exhibit dramatically different brightnesses and apparent speeds, a phenomenon called superluminal asymmetry that occurs because one jet points nearly toward Earth while the other points away.
- 05
Mrk 421, a nearby blazar located 400 million light-years away, was among the first extragalactic sources detected at very-high-energy gamma rays in 1992 by ground-based Cherenkov telescopes.
- 04
Fermi's Large Area Telescope detected gamma-ray emissions from 3C 454.3 reaching energies exceeding 100 billion electron volts, making blazars among the highest-energy persistent sources in the observable universe.
- 03
Variability timescales in blazars can be remarkably short, with some objects like OJ 287 showing significant brightness changes within hours, allowing astronomers to constrain the size of their emitting regions to just light-hours across.
- 02
In 1991, astronomers discovered that PKS 2349-014, a blazar 5 billion light-years away, exhibited superluminal motion with jets apparently traveling at 20 times the speed of light due to relativistic beaming effects.
- 01
The most luminous blazars can emit more energy in a single day than our Sun will in its entire 10-billion-year lifetime.