Journal
ASTROPHYSICAL JOURNAL LETTERS
Volume 705, Issue 1, Pages L20-L24Publisher
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/705/1/L20
Keywords
galaxies: active; galaxies: evolution; galaxies: individual (SDSS J131642.90+175332.5); quasars: emission lines
Categories
Funding
- NSFC [10873017]
- 973 program [2009CB824800]
- MPG-CAS
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We present an analysis of the active galaxy SDSS J131642.90+175332.5, which is remarkable because all of its narrow emission lines are double-peaked, and because it additionally shows an extra broad component (FHWM similar to 1400 km s(-1)) in most of its forbidden lines, peaking in between the two narrow systems. The peaks of the two narrow systems are separated by 400-500 km s(-1) in velocity space. The spectral characteristics of double-peaked [O III] emission have previously been interpreted as a signature of dual or binary active galactic nuclei (AGNs), among other models. In the context of the binary scenario, SDSS J131642.90+175332.5 is a particularly good candidate because not just one line but all of its emission lines are double-peaked. However, we also discuss a number of other scenarios which can potentially account for double-peaked narrow emission lines, including projection effects, a two-sided outflow, jet-cloud interactions, special narrow-line region (NLR) geometries (disks, bars, or inner spirals), and a galaxy merger with only one AGN illuminating two NLRs. We argue that the similarity of the emission-line ratios in both systems, and the presence of the very unusual broad component at intermediate velocity, makes a close pair of unrelated AGNs unlikely, and rather argues for processes in a single galaxy or merger. We describe future observations that can distinguish between these remaining possibilities.
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