Sentences with phrase «brightness of active galactic nuclei»
A popular theory known as the «unified theory» suggests that differences in the brightness of active galactic nuclei, as seen from here on Earth, are due to the placement of this donut of obscuring dust relative to our angle of observation.
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To excite the voorwerp's glow, the black hole and its surrounding accretion disk, the active galactic nucleus, or AGN, should have had the brightness of about 2.5 trillion suns; its radio emission, however, suggested the AGN emitted the equivalent of a relatively paltry 25,000 suns.
The nuclear region of M87 is known as an «active galactic nucleus» due to its brightness in visible, x-ray, radio, and other wavelengths of light.