Blueshifted [O III] Emission: Indications of a Dynamic NLR

Abstract

The [O III] 5007 line is commonly used as an indicator of the systemic redshift of AGNs. Also, recent studies have used the width of this emission line as a proxy for the stellar velocity dispersion in the host galaxy. This paper calls both of these assumptions into question by analyzing a sample of approximately 400 AGN spectra from the first data release of the Sloan Digital Sky 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 that redshift. For the sample studied here, the average shift is 40 km/s, with the largest shift being over 400 km/s. The magnitude of this shift is found to be correlated with a number of properties, including the width of the [O III] line and the Eddington ratio (L/L${}_{Edd}$), derived from the luminosity and width of H-beta.

17 pages, 4 figures, accepted for publication in the Astronomical Journal

References in corpus (2)

• Conference Summary: AGN Physics with the Sloan Digital Sky Survey
• Probing the Kinematics of the Narrow-Line Region in Seyfert Galaxies with Slitless Spectroscopy: Observational Results

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