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We have newly identified a substantial number of type 1 active galacticnuclei (AGN) featuring weak broad-line regions (BLRs) at z < 0.2 from detailedanalysis of galaxy spectra in the Sloan Digital Sky Survey Data Release 7.These objects predominantly show a stellar continuum but also a broad H-alphaemission line, indicating the presence of a low-luminosity AGN oriented so thatwe are viewing the central engine directly without significant obscuration.These accreting black holes have previously eluded detection due to their weaknature. The new BLR AGNs we found increased the number of known type 1 AGNs by49%. Some of these new BLR AGNs were detected at the Chandra X-ray Observatory,and their X-ray properties confirm that they are indeed type 1 AGN. Based onour new and more complete catalogue of type 1 AGNs, we derived the type 1fraction of AGNs as a function of [OIII] 5007 emission luminosity and exploredthe possible dilution effect on the obscured AGN due to star-formation. The newtype 1 AGN fraction shows much more complex behavior with respect to black holemass and bolometric luminosity than suggested by the existing receding torusmodel. The type 1 AGN fraction is sensitive to both of these factors, and thereseems to be a sweet spot (ridge) in the diagram of black hole mass andbolometric luminosity. Furthermore, we present a hint that the Eddington ratioplays a role in determining the opening angles.

A New Catalogue of Type 1 AGN and its Implication on the AGN Unified Model