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| Main Authors: | , , , |
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| Format: | Preprint |
| Published: |
2024
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2410.18401 |
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| _version_ | 1866913561702301696 |
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| author | Chen, Zhi-fu Chen, Zhe-Geng Peng, Xing-long Huang, Wei-rong |
| author_facet | Chen, Zhi-fu Chen, Zhe-Geng Peng, Xing-long Huang, Wei-rong |
| contents | Radio spectral shape of quasars can provide insight into the ages of quasars. We have compiled data for 1804 quasars with $z\lesssim1$ 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 $α^{\rm 144}_{\rm 3000}$ (with $S(ν)\proptoν^α$), is analyzed between 144 MHz 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 $α^{\rm 144}_{\rm 3000}$. 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_18401 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Narrow [O III] emission lines as a potential proxy for the evolutionary stage of quasars Chen, Zhi-fu Chen, Zhe-Geng Peng, Xing-long Huang, Wei-rong Astrophysics of Galaxies Radio spectral shape of quasars can provide insight into the ages of quasars. We have compiled data for 1804 quasars with $z\lesssim1$ 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 $α^{\rm 144}_{\rm 3000}$ (with $S(ν)\proptoν^α$), is analyzed between 144 MHz 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 $α^{\rm 144}_{\rm 3000}$. 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. |
| title | Narrow [O III] emission lines as a potential proxy for the evolutionary stage of quasars |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2410.18401 |