Broad Line Region - The high-density region in a quasar where broad emission lines are formed
Brown Dwarf - A star with too low a mass for nuclear fusion to begin in its core ...
Broad Line Region
Blaauw Mechanism
A mechanism advanced to explain the disruption of a binary system by the decrease in the gravitational binding force when an ejected shell overtakes the secondary component.
Very Broad Line Region
Vector
A quantity which has both magnitude and direction, such as the spin of a magnetic atom in the Heisenberg model. [D89]
Vector Boson ...
When the molecular torus is viewed edge-on, the black hole, accretion disk and broad line region are hidden. Thus when spectra are taken we see emission lines from the narrow region only, and some infrared emission from the torus itself.
html Grzcyrgba says: you might add that Seyferts are spiral galaxies only. The broad line is due to revolution around the black hole. In narrow-line galaxies, the broad line region is probably obscured by dust.
 See also: Light, Magnitude, Spectrum, Distance, Star
  
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