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Multiline Assessmen...
Multiline Assessment of Narrow-line Regions in z similar to 3 Radio Galaxies
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- Terao, Koki (författare)
- Tohoku University
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- Nagao, Tohru (författare)
- Ehime University
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- Onishi, Kyoko, 1989 (författare)
- Chalmers tekniska högskola,Chalmers University of Technology
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Matsuoka, Kenta (författare)
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- Akiyama, Masayuki (författare)
- Tohoku University
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- Matsuoka, Yoshiki (författare)
- Ehime University
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- Yamashita, Takuji (författare)
- Ehime University,National Astronomical Observatory of Japan
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(creator_code:org_t)
- 2022-04-12
- 2022
- Engelska.
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Ingår i: Astrophysical Journal. - : American Astronomical Society. - 1538-4357 .- 0004-637X. ; 929:1
- Relaterad länk:
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https://research.cha... (primary) (free)
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https://research.cha...
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https://doi.org/10.3...
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Abstract
Ämnesord
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- 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.
Ämnesord
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Meteorologi och atmosfärforskning (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Meteorology and Atmospheric Sciences (hsv//eng)
- NATURVETENSKAP -- Fysik -- Astronomi, astrofysik och kosmologi (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Astronomy, Astrophysics and Cosmology (hsv//eng)
- NATURVETENSKAP -- Geovetenskap och miljövetenskap -- Miljövetenskap (hsv//swe)
- NATURAL SCIENCES -- Earth and Related Environmental Sciences -- Environmental Sciences (hsv//eng)
Publikations- och innehållstyp
- art (ämneskategori)
- ref (ämneskategori)
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