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

Todd A. Boroson | Zendy

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

Author(s) -

Todd A. Boroson

Publication year - 2005

Publication title -

the astronomical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.61

H-Index - 271

eISSN - 1538-3881

pISSN - 0004-6256

DOI - 10.1086/431722

Subject(s) - astrophysics , redshift , physics , doubly ionized oxygen , galaxy , active galactic nucleus , equivalent width , emission spectrum , velocity dispersion , line (geometry) , spectral line , luminosity , line width , sky , ionization , astronomy , optics , geometry , mathematics , ion , quantum mechanics

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

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