A disk wind whose base becomes slightly denser can briefly shield the broad-line region from ionizing radiation, producing the observed emission-line holiday in NGC 5548 and linking it to changing-look quasars.
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A wind-based unification model for NGC 5548: spectral holidays, non-disk emission, and implications for changing-look quasars
A disk wind whose base becomes slightly denser can briefly shield the broad-line region from ionizing radiation, producing the observed emission-line holiday in NGC 5548 and linking it to changing-look quasars.