Double-Peaked Narrow-Line Active Galactic Nuclei. II. The Case Of Equal Peaks




Smith, K. L.
Shields, Gregory A.
Salviander, Sarah
Stevens, A. C.
Rosario, D. J.

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Active galactic nuclei (AGNs) with double-peaked narrow lines (DPAGNs) may be caused by kiloparsec-scale binary AGNs, bipolar outflows, or rotating gaseous disks. We examine the class of DPAGNs in which the two narrow-line components have closely similar intensity as being especially likely to involve disks or jets. Two spectroscopic indicators support this likelihood. For DPAGNs from Smith et al., the "equal-peaked" objects (EPAGNs) have [Ne V]/[O III] ratios lower than for a control sample of non-double-peaked AGNs. This is unexpected for a pair of normal AGNs in a galactic merger, but may be consistent with [O III] emission from a rotating ring with relatively little gas at small radii. Also, [O III]/H beta ratios of the redshifted and blueshifted systems in the EPAGN are more similar to each other than in a control sample, suggestive of a single ionizing source and inconsistent with the binary interpretation.



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Smith, K. L., G. A. Shields, S. Salviander, A. C. Stevens, and D. J. Rosario. "Double-peaked Narrow-line Active Galactic Nuclei. II. The Case of Equal Peaks." The Astrophysical Journal, Vol. 752, No. 1 (Jun., 2012): 63.