2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/6710Using LBQS data, it seems that the predictions of the model is confirmed by observations. The behavior of comoving density versus redshift is consistent with LDDE for QSQs. Considering the cosmic evolution of SFR, a unified aspect for origin and evolution of QSOs and ordinary galaxies is implied by this model.Astrophysicstext