Powered by supermassive black holes swallowing matter in the centers of galaxies, active galactic nuclei are the most powerful compact steady sources of energy in the universe. The brightest active ...

Located only 56 million light-years away in Ursa Major, NGC 4102 gives astronomers a nearby target to study how these active ...

Active galactic nuclei — the bright, noisy cores of galaxies where supermassive black holes accrete huge quantities of matter — are the most luminous stable objects in the sky. But they may be far ...

Blazars represent one of the most intriguing classes of active galactic nuclei, where relativistic jets are oriented close to our line of sight. This favourable geometry magnifies the observed ...

The radio astronomy satellite HALCA is maintaining its space observations under the VLBI Space Observatory Program (VSOP), in cooperation with the global tracking network and the radio astronomical ...

Black holes residing at the center of galaxies produce way more energy than scientists previously thought, a new study has revealed. These so-called active galactic nuclei devour huge amounts of ...

Scientists have long thought that when galaxies collide, the violent process delivers gas that feeds supermassive black holes and acts as fuel for energetic outbursts. Now, astronomers have obtained ...

Scientists have discovered a supermassive black hole flare, the largest seen in the universe, and it may be making a meal of ...

Astronomers at the Indian Institute of Astrophysics have discovered that radiation and jets from supermassive black holes ...