Monthly Notices of the Royal Astronomical Society · 1977 · 82 citations · 0 references
Natural SciencesAstronomyPhysicsInterstellar MediumMolecular PhysicsSpectroscopyH Ii RegionsSelection RulesReddening In H Ii Regions
The average Lyα/Hβ intensity ratio in the spectra of QSOs is found to be much smaller than expected. The continuum energy distributions of some QSOs are shown to be modestly reddened, but it is probable that the main cause of the small Lyα/Hβ ratio is enhancement of Hβ rather than the depletion of Lyα.