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单词 active galactic nucleus
释义

active galactic nucleus


active galactic nucleus

n. A galactic nucleus that emits more radiation than can be accounted for solely by light from the stars it contains.

active galactic nucleus


active galactic nucleus

(AGN) See active galaxy.

active galactic nucleus

[¦ak·tiv gə‚lak·tik ′nü·klē·əs] (astronomy) A central region of a galaxy, a light-year or less in diameter, where violent and apparently explosive behavior is observed which is manifested in many ways, including the high-velocity outflow of gas, strong nonthermal radio emission, intense and often polarized and highly variable radiation over a wide range of wavelength bands, and ejection of jets of relativistic material.
See AGN
See AGN
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