The signature of LLAGNs in the nearby universe
Abstract
We have used the diagnostic diagram that compares the ratio of emission lines [NII]λ6584/Hα with the equivalent width of [NII]λ6584, as proposed by Coziol et al. (1998), to determine the source of ionization of SDSS NELGs that cannot be classified by standard diagnostic diagrams, because the emission line [OIII]λ5007, Hβ, or both, are missing. We find these galaxies to be consistent with low luminosity AGNs, suggesting that this characteristic is the signature of the LLAGNs in the nearby Universe.
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