Jensangjun K.Yuma S.Mahidol University2025-06-202025-06-202025-06-10Astrophysical Journal Vol.986 No.1 (2025)0004637Xhttps://repository.li.mahidol.ac.th/handle/123456789/110805We present a study of the gas kinematics in narrow-line regions (NLRs) of 2009 Type 2 active galactic nuclei (AGNs) at z < 0.34. We construct [O iii] λ5007 emission-line images using publicly available broadband images from the Sloan Digital Sky Survey (SDSS). The [O iii] emission areas of the samples, measured down to a rest-frame isophote of 1.4 × 10⁻¹⁵ erg s⁻¹ cm⁻² arcsec⁻², range from 3.7 up to 224 kpc². With our broadband technique, we found a correlation between [O iii] area and AGN luminosity inferred from the [O iii] luminosity and the mid-infrared luminosity at rest-frame 15 μm. The isophotal threshold used to determine the [O iii] area affects the correlation strength in that a brighter isophote yields a stronger correlation between the [O iii] area and AGN luminosity. The presence of gas outflows is examined by the ratio of the [O iii] velocity dispersion to the stellar velocity dispersion (σ<inf>[O iii]</inf>/σ<inf>⋆</inf> > 1.4) using SDSS spectra. At a given luminosity, objects with and without outflows exhibit the same extent of [O iii] emission. Their correlation between [O iii] area and luminosity is almost identical. It is suggested that the size of NLRs is not affected by outflow mechanisms but rather by photoionization from the central AGNs.Earth and Planetary SciencesPhysics and AstronomyArticleSCOPUS10.3847/1538-4357/add4112-s2.0-10500791914315384357