Different dependence of narrow H$α$ line luminosity on optical continuum luminosity between starforming galaxies and Type-2 AGN: globally negative AGN feedback in local Type-2 AGN?
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arXiv
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| Format: | Preprint |
| Publié: |
2024
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| _version_ | 1866916118291021824 |
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| author | Zhang, XueGuang |
| author_facet | Zhang, XueGuang |
| contents | In this manuscript, clues are provided to support globally negative AGN feedback on star formation in the host galaxies of the local low-redshift SDSS Type-2 AGN, based on the different dependence of narrow H$α$ line luminosity $L_{Hα}$ on optical continuum luminosity $λL_{cont}$ between the starforming galaxies and the Type-2 AGN. Through the measured $L_{Hα}$ and $λL_{cont}$ in SDSS starforming galaxies, there is a strong linear correlation between $λL_{cont}$ and $L_{Hα}$, accepted as a standard correlation without effects of AGN activity. Meanwhile, considering apparent contributions of AGN activity to narrow H$α$ line emissions in the Type-2 AGN, the correlation between $λL_{cont}$ and $L_{Hα}$ in the SDSS Type-2 AGN leads to statistically lower $L_{Hα}$ in the Type-2 AGN than in the starforming galaxies, with significance level higher than 5$σ$, even after considering necessary effects (including effects of host galaxy properties), leading to accepted conclusion on the globally negative AGN feedback in the local Type-2 AGN. Meanwhile, properties of Dn(4000) and H$δ_A$ can provide indirect clues to support the globally negative AGN feedback in the local Type-2 AGN, due to older stellar ages in the Type-2 AGN. Moreover, it is interesting to expect more than 50\% narrow H$α$ emissions globally suppressed in the host galaxies of the Type-2 AGN relative to the starforming galaxies. The results not only support globally negative AGN feedback in the local Type-2 AGN, but also show further clues on the quantification of suppressions of star formation by the globally negative AGN feedback. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2402_05365 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Different dependence of narrow H$α$ line luminosity on optical continuum luminosity between starforming galaxies and Type-2 AGN: globally negative AGN feedback in local Type-2 AGN? Zhang, XueGuang Astrophysics of Galaxies In this manuscript, clues are provided to support globally negative AGN feedback on star formation in the host galaxies of the local low-redshift SDSS Type-2 AGN, based on the different dependence of narrow H$α$ line luminosity $L_{Hα}$ on optical continuum luminosity $λL_{cont}$ between the starforming galaxies and the Type-2 AGN. Through the measured $L_{Hα}$ and $λL_{cont}$ in SDSS starforming galaxies, there is a strong linear correlation between $λL_{cont}$ and $L_{Hα}$, accepted as a standard correlation without effects of AGN activity. Meanwhile, considering apparent contributions of AGN activity to narrow H$α$ line emissions in the Type-2 AGN, the correlation between $λL_{cont}$ and $L_{Hα}$ in the SDSS Type-2 AGN leads to statistically lower $L_{Hα}$ in the Type-2 AGN than in the starforming galaxies, with significance level higher than 5$σ$, even after considering necessary effects (including effects of host galaxy properties), leading to accepted conclusion on the globally negative AGN feedback in the local Type-2 AGN. Meanwhile, properties of Dn(4000) and H$δ_A$ can provide indirect clues to support the globally negative AGN feedback in the local Type-2 AGN, due to older stellar ages in the Type-2 AGN. Moreover, it is interesting to expect more than 50\% narrow H$α$ emissions globally suppressed in the host galaxies of the Type-2 AGN relative to the starforming galaxies. The results not only support globally negative AGN feedback in the local Type-2 AGN, but also show further clues on the quantification of suppressions of star formation by the globally negative AGN feedback. |
| title | Different dependence of narrow H$α$ line luminosity on optical continuum luminosity between starforming galaxies and Type-2 AGN: globally negative AGN feedback in local Type-2 AGN? |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2402.05365 |