Narrow [O iii] Emission Lines as a Potential Proxy for the Evolutionary Stage of Quasars

Radio spectral shape of quasars can provide insight into the ages of quasars. We have compiled data for 1804 quasars with z ≲ 1 from the Sloan Digital Sky Survey (SDSS). Additionally, these quasars were also mapped by the Low-Frequency Array at 144 MHz and the Very Large Array Sky Survey at 3000 MHz...

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Veröffentlicht in:The Astrophysical journal 2024-10, Vol.974 (2), p.277
Hauptverfasser: Chen, Zhi-fu, Chen, Zhe-Geng, Peng, Xing-long, Huang, Wei-rong
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Sprache:eng
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Zusammenfassung:Radio spectral shape of quasars can provide insight into the ages of quasars. We have compiled data for 1804 quasars with z ≲ 1 from the Sloan Digital Sky Survey (SDSS). Additionally, these quasars were also mapped by the Low-Frequency Array at 144 MHz and the Very Large Array Sky Survey at 3000 MHz. The radio spectral index, designated as α 3000 144 (with S ( ν ) ∝ ν α ), is analyzed between 144 and 3000 MHz as a proxy for the ages of quasars. We measure the [O III ] λ 5007 emission line in the SDSS spectra. A strong correlation was found between the equivalent width of the core component of the [O III ] λ 5007 emission line and α 3000 144 . This relationship suggests that the core component of the [O III ] λ 5007 emission line could potentially serve as a surrogate for the evolutionary stage of a quasar. The quasars at an early stage of evolutions tend to show weaker [O III ] λ 5007 emission, while older quasars exhibit stronger [O III ] λ 5007 emission.
ISSN:0004-637X
1538-4357
DOI:10.3847/1538-4357/ad79ff