Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus Feedback
We analyze a sample of ~113,000 galaxies ( z < 0.3) from the Sloan Digital Sky Survey, divided into star-forming, composite, Seyfert, and LINER types, to explore the relationships between UV-to-optical colors ( u – r ), star formation rates (SFRs), specific SFRs (sSFRs), stellar velocity disper...
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2025-01-01
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| author | Huynh Anh N. Le Yongquan Xue |
| author_facet | Huynh Anh N. Le Yongquan Xue |
| author_sort | Huynh Anh N. Le |
| collection | DOAJ |
| description | We analyze a sample of ~113,000 galaxies ( z < 0.3) from the Sloan Digital Sky Survey, divided into star-forming, composite, Seyfert, and LINER types, to explore the relationships between UV-to-optical colors ( u – r ), star formation rates (SFRs), specific SFRs (sSFRs), stellar velocity dispersions ( σ _* ), mass accretion rates onto the black hole ( ${L}_{[{\rm{O}}\,{\rm{III}}]}/{\sigma }_{\ast }^{4}$ ), and Eddington ratios. Star-forming galaxies predominantly feature young, blue stars along the main-sequence (MS) line, while composite, Seyfert, and LINER galaxies deviate from this line, displaying progressively older stellar populations and lower SFRs. The ${L}_{[{\rm{O}}\,{\rm{III}}]}/{\sigma }_{\ast }^{4}$ and Eddington ratios are highest in Seyfert galaxies, moderate in composite galaxies, and lowest in LINERs, with higher ratios associated with bluer colors, indicating a younger stellar population and stronger active galactic nucleus (AGN) activity. These trends suggest a strong correlation between sSFRs and Eddington ratios, highlighting a close connection between AGN and star formation activities. These results may imply an evolutionary sequence where galaxies transition from blue star-forming galaxies to red LINERs, passing through the composite and Seyfert phases, driven primarily by gas supply, with AGN feedback playing a secondary role. While both the radio luminosities ( L _1.4 GHz ) and Eddington ratios correlate with SFRs, their trends differ on the SFR−stellar-mass ( M _* ) plane, with the radio luminosities increasing with stellar mass along the MS line and no direct connection between the radio luminosities and Eddington ratios. These findings may provide new insights into the interplay between star formation, AGN activity, and radio emission in galaxies, shedding light on their evolutionary pathways. |
| format | Article |
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| institution | Kabale University |
| issn | 1538-4357 |
| language | English |
| publishDate | 2025-01-01 |
| publisher | IOP Publishing |
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| series | The Astrophysical Journal |
| spelling | doaj-art-e78a45ad0fae4894b72e84b49585a5562025-01-17T08:21:39ZengIOP PublishingThe Astrophysical Journal1538-43572025-01-0197915810.3847/1538-4357/ad9d38Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus FeedbackHuynh Anh N. Le0https://orcid.org/0000-0003-1270-9802Yongquan Xue1https://orcid.org/0000-0002-1935-8104CAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China , Hefei 230026, People’s Republic of China ; lha@ustc.edu.cn, xuey@ustc.edu.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaCAS Key Laboratory for Research in Galaxies and Cosmology, Department of Astronomy, University of Science and Technology of China , Hefei 230026, People’s Republic of China ; lha@ustc.edu.cn, xuey@ustc.edu.cn; School of Astronomy and Space Science, University of Science and Technology of China , Hefei 230026, People’s Republic of ChinaWe analyze a sample of ~113,000 galaxies ( z < 0.3) from the Sloan Digital Sky Survey, divided into star-forming, composite, Seyfert, and LINER types, to explore the relationships between UV-to-optical colors ( u – r ), star formation rates (SFRs), specific SFRs (sSFRs), stellar velocity dispersions ( σ _* ), mass accretion rates onto the black hole ( ${L}_{[{\rm{O}}\,{\rm{III}}]}/{\sigma }_{\ast }^{4}$ ), and Eddington ratios. Star-forming galaxies predominantly feature young, blue stars along the main-sequence (MS) line, while composite, Seyfert, and LINER galaxies deviate from this line, displaying progressively older stellar populations and lower SFRs. The ${L}_{[{\rm{O}}\,{\rm{III}}]}/{\sigma }_{\ast }^{4}$ and Eddington ratios are highest in Seyfert galaxies, moderate in composite galaxies, and lowest in LINERs, with higher ratios associated with bluer colors, indicating a younger stellar population and stronger active galactic nucleus (AGN) activity. These trends suggest a strong correlation between sSFRs and Eddington ratios, highlighting a close connection between AGN and star formation activities. These results may imply an evolutionary sequence where galaxies transition from blue star-forming galaxies to red LINERs, passing through the composite and Seyfert phases, driven primarily by gas supply, with AGN feedback playing a secondary role. While both the radio luminosities ( L _1.4 GHz ) and Eddington ratios correlate with SFRs, their trends differ on the SFR−stellar-mass ( M _* ) plane, with the radio luminosities increasing with stellar mass along the MS line and no direct connection between the radio luminosities and Eddington ratios. These findings may provide new insights into the interplay between star formation, AGN activity, and radio emission in galaxies, shedding light on their evolutionary pathways.https://doi.org/10.3847/1538-4357/ad9d38Active galaxiesStar formation |
| spellingShingle | Huynh Anh N. Le Yongquan Xue Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus Feedback The Astrophysical Journal Active galaxies Star formation |
| title | Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus Feedback |
| title_full | Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus Feedback |
| title_fullStr | Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus Feedback |
| title_full_unstemmed | Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus Feedback |
| title_short | Nuclear and Star Formation Activities in Nearby Galaxies: Roles of Gas Supply and Active Galactic Nucleus Feedback |
| title_sort | nuclear and star formation activities in nearby galaxies roles of gas supply and active galactic nucleus feedback |
| topic | Active galaxies Star formation |
| url | https://doi.org/10.3847/1538-4357/ad9d38 |
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