active galactic nucleus

(redirected from Active galaxies)
Also found in: Encyclopedia.
Related to Active galaxies: Quasars

active galactic nucleus

n.
A galactic nucleus that emits more radiation than can be accounted for solely by light from the stars it contains.
References in periodicals archive ?
An expert in extragalactic astronomy, Kinney has published more than 80 papers on quasars, blazars, active galaxies and normal galaxies, and signatures of accretion disks in active galaxies.
The new ideas surrounding the differences between the galaxy types are supported with data evidence of more than 800 active galaxies from the (https://swift.
Fayoum Observatory at night - Astrotrips "Topics include the formation and characteristics of the Solar System, including the planets and minor members of the system; telescopes; the Sun; the birth, life and death of stars; galaxies and dark matter; active galaxies and quasars; Big Bang cosmology," said Astrotrips instructor Amr Abdulwahab on the event page.
Specific topics include eclipses and the motion of the moon, the origin of the solar system, the nature of the stars, black holes, and quasars and active galaxies.
These accelerators include supernova remnants and active galaxies known as blazars that shoot out blasts of particles.
We'll be studying objects spanning the full gamut of astronomical topics including planets, moons, asteroids and comets in our solar system; star and planet formation; extrasolar planets and the evolution of planetary systems; the interstellar medium and interstellar chemistry; the nucleus of the Milky Way galaxy, and nearby normal and active galaxies.
One day 3C 279 was just one of many active galaxies we see, and the next day it was the brightest thing in the gamma-ray sky," said Sara Cutini, a Fermi Large Area Telescope scientist at the Italian Space Agency's Science Data Center in Rome.
It tells us more about the powerful ionized winds that allow supermassive black holes in the nuclei of active galaxies to expel large amounts of matter.
spectroscopic survey to search for active galaxies.
Officials said the primary goals of the mission are to conduct a deep survey for supermassive black holes, study particle acceleration in active galaxies, and measure radioactive isotopes in young supernova remnants in our own galaxy.
Kevin Schawinski, of Yale University, said: "We just don't see such active galaxies today.
The time in Texas indeed shaped much of Tony's later research career; his interest in active galaxies and supernovae (valuable for measuring the scale of the universe) were strengthened from the time spent in California with Fritz Zwicky, whom Tony held in the highest regard.