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| Format: | Preprint |
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2025
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| Online Access: | https://arxiv.org/abs/2501.18692 |
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| _version_ | 1866909601937489920 |
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| author | Jensangjun, Kantapon Yuma, Suraphong |
| author_facet | Jensangjun, Kantapon Yuma, Suraphong |
| contents | We present the study of the gas kinematics in narrow-line regions (NLRs) of 2,009 type-2 AGNs at $z<0.34$. We construct the [O III]$λ$5007 emission-line images using publicly available broadband images from the Sloan Digital Sky Survey (SDSS). The [O III] emission area of the samples, measured down to $1.4\times10^{-15}$ erg/s/cm$^2$/arcsec$^2$, ranges from 3.7 kpc$^2$ up to 224 kpc$^2$. With our broadband technique, we found the strong correlation between [O III] area and AGN luminosity inferred from the [O III] luminosity and the mid-infrared luminosity at the rest-frame $15μ$m. The isophotal threshold used to determine the [O III] area affects the correlation strength in that the brighter isophote yields the stronger correlation between the [O III] area and AGN luminosity. The presence of gas outflow is examined by the ratio of the [O III] velocity dispersion to the stellar velocity dispersion ($σ_{\rm [O\,III]}/σ_\star > 1.4$) using the SDSS spectra. At the given luminosity, the objects with and without outflows exhibit the same extension of the [O III] emission. Their correlation between the [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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2501_18692 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The outflow impacts on the size of the narrow-line region among type-2 AGNs Jensangjun, Kantapon Yuma, Suraphong Astrophysics of Galaxies We present the study of the gas kinematics in narrow-line regions (NLRs) of 2,009 type-2 AGNs at $z<0.34$. We construct the [O III]$λ$5007 emission-line images using publicly available broadband images from the Sloan Digital Sky Survey (SDSS). The [O III] emission area of the samples, measured down to $1.4\times10^{-15}$ erg/s/cm$^2$/arcsec$^2$, ranges from 3.7 kpc$^2$ up to 224 kpc$^2$. With our broadband technique, we found the strong correlation between [O III] area and AGN luminosity inferred from the [O III] luminosity and the mid-infrared luminosity at the rest-frame $15μ$m. The isophotal threshold used to determine the [O III] area affects the correlation strength in that the brighter isophote yields the stronger correlation between the [O III] area and AGN luminosity. The presence of gas outflow is examined by the ratio of the [O III] velocity dispersion to the stellar velocity dispersion ($σ_{\rm [O\,III]}/σ_\star > 1.4$) using the SDSS spectra. At the given luminosity, the objects with and without outflows exhibit the same extension of the [O III] emission. Their correlation between the [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. |
| title | The outflow impacts on the size of the narrow-line region among type-2 AGNs |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2501.18692 |