The formation of broad emission line regions in supernova-QSO wind interactions

We show that a cooled region of shocked supernova ejecta forms in a type II supernova-QSO wind interaction, and has a density, an ionization parameter , and a column density compatible with those inferred for the high ionizati on component of the broad emission line regions in QSOs. The calculations a re based on the assumption that the ejecta ow is described initially by a s imilarity solution investigated by Chevalier (1982) and Nadyozhin (1985) an d is spherically symmetric. Heating and cooling appropriate for gas irradia ted by a nearby powerful continuum source is included in our model, togethe r with reasonable assumptions for the properties of the QSO wind. The model results are also in agreement with observational correlations and imply re asonable supernova rates.