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1.	Terao, Koki, et al. (author) Multiline Assessment of Narrow-line Regions in z similar to 3 Radio Galaxies 2022 In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 929:1 Journal article (peer-reviewed)abstract In this paper, we use high-quality rest-UV spectra of three radio galaxies at z similar to 3 observed with the FORS2 camera on the Very Large Telescope to measure the flux of several emission lines, including relatively faint ones, such as N iv]lambda 1486, O iii]lambda 1663, and [Ne iv]lambda 2424. Additionally, we collect fluxes of faint rest-UV emission lines in 12 z similar to 3 radio galaxies from the literature. Previously, physical and chemical properties of narrow-line regions (NLRs) in high-z active galactic nuclei (AGNs) have been investigated mostly by using only strong rest-UV emission lines (e.g., N v lambda 1240, C iv lambda 1549, He ii lambda 1640, and C iii]lambda 1909). Such strong-line diagnostics are based on various assumptions due to the limitation in the number of available emission-line constraints. In this work, both physical and chemical properties of NLR clouds in each object are estimated by fitting detailed photoionization models to the measured emission-line fluxes. We confirm that the metallicity of NLRs in AGNs at z similar to 3 is solar or supersolar, without assumptions about the gas density and ionization parameter thanks to the constraints from the faint emission lines. This result suggests that high-z radio galaxies are already chemically mature at z similar to 3.

Terao, Koki, et al. (author)
Multiline Assessment of Narrow-line Regions in z similar to 3 Radio Galaxies
2022
In: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 929:1
Journal article (peer-reviewed)abstract
- In this paper, we use high-quality rest-UV spectra of three radio galaxies at z similar to 3 observed with the FORS2 camera on the Very Large Telescope to measure the flux of several emission lines, including relatively faint ones, such as N iv]lambda 1486, O iii]lambda 1663, and [Ne iv]lambda 2424. Additionally, we collect fluxes of faint rest-UV emission lines in 12 z similar to 3 radio galaxies from the literature. Previously, physical and chemical properties of narrow-line regions (NLRs) in high-z active galactic nuclei (AGNs) have been investigated mostly by using only strong rest-UV emission lines (e.g., N v lambda 1240, C iv lambda 1549, He ii lambda 1640, and C iii]lambda 1909). Such strong-line diagnostics are based on various assumptions due to the limitation in the number of available emission-line constraints. In this work, both physical and chemical properties of NLR clouds in each object are estimated by fitting detailed photoionization models to the measured emission-line fluxes. We confirm that the metallicity of NLRs in AGNs at z similar to 3 is solar or supersolar, without assumptions about the gas density and ionization parameter thanks to the constraints from the faint emission lines. This result suggests that high-z radio galaxies are already chemically mature at z similar to 3.

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