English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Tools annual

Global: Zendy Free Plan

Global: Zendy Tools monthly

Global: Zendy Plus monthly

We present an analysis of the active galaxy SDSS J131642.90+175332.5, whichis remarkable because all of its narrow emission lines are double-peaked, andbecause it additionally shows an extra broad component (FHWM ~ 1400 km/s) inmost of its forbidden lines, peaking in between the two narrow systems. Thepeaks of the two narrow systems are separated by 400--500 km/s in velocityspace. The spectral characteristics of double-peaked [O III] emission havepreviously been interpreted as a signature of dual or binary active galacticnuclei (AGNs), among other models. In the context of the binary scenario, SDSSJ131642.90+175332.5 is a particularly good candidate because not just one linebut all of its emission lines are double-peaked. However, we also discuss anumber of other scenarios which can potentially account for double-peakednarrow 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 twoNLRs. 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 processesin a single galaxy or merger. We describe future observations which candistinguish between these remaining possibilities.

astrophysical journal/the astrophysical journal

Narrow double-peaked emission lines of SDSS J131642.90+175332.5:  signature of a single or a binary AGN in a merger, jet-cloud interaction, or  unusual narrow-line region geometry