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It is well-known that the higher policyclic aromatic hydrocarbon (PAH)abundance, lower black hole mass, higher accretion rate and lower luminositiesare among the major characteristics of Narrow-Line Seyfert galaxies (NLS1),when they are compared to Broad line Seyfert galaxies (BLS1). NLS1s may benormal Seyfert galaxies at an early stage of evolution, their black holes maystill be growing and/or they could be special for some other reason. In thiswork we discuss the findings that NLS1s have most of line and continuumluminosities correlated with FWHM(H$\beta$), which may be the trace of theirrapid black hole mass grow. BLS1 do not show such trends. Also, PAHs may bedestroyed as the black hole grows and the starbursts are removed, for NLS1objects.

Kinematic differences between NLS1 and BLAGN sources