The Outflow Impact on the Size of the Narrow-line Region among Type 2 Active Galactic Nuclei
2
Issued Date
2025-06-10
Resource Type
ISSN
0004637X
eISSN
15384357
Scopus ID
2-s2.0-105007919143
Journal Title
Astrophysical Journal
Volume
986
Issue
1
Rights Holder(s)
SCOPUS
Bibliographic Citation
Astrophysical Journal Vol.986 No.1 (2025)
Suggested Citation
Jensangjun K., Yuma S. The Outflow Impact on the Size of the Narrow-line Region among Type 2 Active Galactic Nuclei. Astrophysical Journal Vol.986 No.1 (2025). doi:10.3847/1538-4357/add411 Retrieved from: https://repository.li.mahidol.ac.th/handle/123456789/110805
Title
The Outflow Impact on the Size of the Narrow-line Region among Type 2 Active Galactic Nuclei
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Abstract
We 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<sup>−15</sup> erg s<sup>−1</sup> cm<sup>−2</sup> arcsec<sup>−2</sup>, range from 3.7 up to 224 kpc<sup>2</sup>. 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.