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The [O III] 5007 line is commonly used as an indicator of the systemicredshift of AGNs. Also, recent studies have used the width of this emissionline as a proxy for the stellar velocity dispersion in the host galaxy. Thispaper calls both of these assumptions into question by analyzing a sample ofapproximately 400 AGN spectra from the first data release of the Sloan DigitalSky Survey. These spectra show that the low-ionization forbidden lines ([O II],[N II], [S II]) define a consistent redshift, but that the peak of the [O III]line is blueshifted in approximately half of the AGNs with respect to thatredshift. For the sample studied here, the average shift is 40 km/s, with thelargest shift being over 400 km/s. The magnitude of this shift is found to becorrelated with a number of properties, including the width of the [O III] lineand the Eddington ratio (L/L$_{Edd}$), derived from the luminosity and width ofH-beta.Comment: 17 pages, 4 figures, accepted for publication in the Astronomical  Journa

Blueshifted [Oiii] Emission: Indications of a Dynamic Narrow-Line Region