Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN?
In this manuscript, clues are provided to support globally negative active galactic nuclei (AGN) feedback on star formation in the host galaxies of the local low-redshift Sloan Digital Sky Survey (SDSS) Type 2 AGN, based on the different dependence of narrow H α line luminosity L _H _α on optical co...
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| Format: | Article |
| Language: | English |
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IOP Publishing
2024-01-01
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| Series: | The Astrophysical Journal |
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| Online Access: | https://doi.org/10.3847/1538-4357/ad27d0 |
| _version_ | 1797242603378311168 |
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| author | XueGuang Zhang |
| author_facet | XueGuang Zhang |
| author_sort | XueGuang Zhang |
| collection | DOAJ |
| description | In this manuscript, clues are provided to support globally negative active galactic nuclei (AGN) feedback on star formation in the host galaxies of the local low-redshift Sloan Digital Sky Survey (SDSS) Type 2 AGN, based on the different dependence of narrow H α line luminosity L _H _α on optical continuum luminosity λ L _cont between star-forming galaxies and Type 2 AGN. Through the measured L _H _α and λ L _cont in SDSS star-forming galaxies, there is a strong linear correlation between λ L _cont and L _H _α , accepted as a standard correlation without the effects of AGN activity. Meanwhile, considering the apparent contribution of AGN activity to the narrow H α line emissions in Type 2 AGN, the correlation between λ L _cont and L _H _α in the SDSS Type 2 AGN leads to a statistically lower L _H _α in Type 2 AGN than in star-forming galaxies, with a significance level higher than 5 σ , even after considering necessary effects (including effects of host galaxy properties), leading to the accepted conclusion on the globally negative AGN feedback in the local Type 2 AGN. Meanwhile, the properties of Dn(4000) and H δ _A can provide indirect clues to support the globally negative AGN feedback in local Type 2 AGN, due to older stellar ages in Type 2 AGN. Moreover, it is interesting to expect more than 50% narrow H α emissions globally suppressed in the host galaxies of Type 2 AGN relative to the star-forming galaxies. The results not only support globally negative AGN feedback in local Type 2 AGN, but also show further clues on the quantification of suppressions of star formation by the globally negative AGN feedback. |
| first_indexed | 2024-04-24T18:41:51Z |
| format | Article |
| id | doaj.art-3d76deac320c4b029d8a4008523abc0c |
| institution | Directory Open Access Journal |
| issn | 1538-4357 |
| language | English |
| last_indexed | 2024-04-24T18:41:51Z |
| publishDate | 2024-01-01 |
| publisher | IOP Publishing |
| record_format | Article |
| series | The Astrophysical Journal |
| spelling | doaj.art-3d76deac320c4b029d8a4008523abc0c2024-03-27T10:18:13ZengIOP PublishingThe Astrophysical Journal1538-43572024-01-01964214110.3847/1538-4357/ad27d0Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN?XueGuang Zhang0https://orcid.org/0000-0001-5458-8354Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, GuangXi University , Nanning, 530004, People's Republic of China ; xgzhang@gxu.edu.cnIn this manuscript, clues are provided to support globally negative active galactic nuclei (AGN) feedback on star formation in the host galaxies of the local low-redshift Sloan Digital Sky Survey (SDSS) Type 2 AGN, based on the different dependence of narrow H α line luminosity L _H _α on optical continuum luminosity λ L _cont between star-forming galaxies and Type 2 AGN. Through the measured L _H _α and λ L _cont in SDSS star-forming galaxies, there is a strong linear correlation between λ L _cont and L _H _α , accepted as a standard correlation without the effects of AGN activity. Meanwhile, considering the apparent contribution of AGN activity to the narrow H α line emissions in Type 2 AGN, the correlation between λ L _cont and L _H _α in the SDSS Type 2 AGN leads to a statistically lower L _H _α in Type 2 AGN than in star-forming galaxies, with a significance level higher than 5 σ , even after considering necessary effects (including effects of host galaxy properties), leading to the accepted conclusion on the globally negative AGN feedback in the local Type 2 AGN. Meanwhile, the properties of Dn(4000) and H δ _A can provide indirect clues to support the globally negative AGN feedback in local Type 2 AGN, due to older stellar ages in Type 2 AGN. Moreover, it is interesting to expect more than 50% narrow H α emissions globally suppressed in the host galaxies of Type 2 AGN relative to the star-forming galaxies. The results not only support globally negative AGN feedback in local Type 2 AGN, but also show further clues on the quantification of suppressions of star formation by the globally negative AGN feedback.https://doi.org/10.3847/1538-4357/ad27d0Active galactic nucleiActive galaxiesEmission line galaxiesAGN host galaxies |
| spellingShingle | XueGuang Zhang Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN? The Astrophysical Journal Active galactic nuclei Active galaxies Emission line galaxies AGN host galaxies |
| title | Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN? |
| title_full | Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN? |
| title_fullStr | Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN? |
| title_full_unstemmed | Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN? |
| title_short | Different Dependence of Narrow Hα Line Luminosity on Optical Continuum Luminosity between Star-forming Galaxies and Type 2 Active Galactic Nuclei: Globally Negative AGN Feedback in Local Type 2 AGN? |
| title_sort | different dependence of narrow hα line luminosity on optical continuum luminosity between star forming galaxies and type 2 active galactic nuclei globally negative agn feedback in local type 2 agn |
| topic | Active galactic nuclei Active galaxies Emission line galaxies AGN host galaxies |
| url | https://doi.org/10.3847/1538-4357/ad27d0 |
| work_keys_str_mv | AT xueguangzhang differentdependenceofnarrowhalineluminosityonopticalcontinuumluminositybetweenstarforminggalaxiesandtype2activegalacticnucleigloballynegativeagnfeedbackinlocaltype2agn |