A Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection Modes
We build upon the state-of-the-art semianalytic model FEGA24 for the formation and evolution of galaxies, which integrates the latest prescriptions relevant to galaxy formation and evolution, alongside a comprehensive active galactic nuclei (AGN) feedback model. This model incorporates three modes o...
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2025-01-01
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| Online Access: | https://doi.org/10.3847/1538-4365/addb4b |
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| author | Emanuele Contini Sukyoung K. Yi Jinsu Rhee Seyoung Jeon |
| author_facet | Emanuele Contini Sukyoung K. Yi Jinsu Rhee Seyoung Jeon |
| author_sort | Emanuele Contini |
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| description | We build upon the state-of-the-art semianalytic model FEGA24 for the formation and evolution of galaxies, which integrates the latest prescriptions relevant to galaxy formation and evolution, alongside a comprehensive active galactic nuclei (AGN) feedback model. This model incorporates three modes of feedback: negative (preventing excessive cooling), positive (enhancing star formation), and hot gas ejection (expelling gas beyond the virial radius of halos). These modes operate in a coordinated manner: the negative mode regulates the cooling process, the positive mode promotes bursts of star formation, and the hot gas ejection mode expels gas beyond the virial radius when the AGN is sufficiently powerful. Our updated semianalytic model, FEGA25 , retains the qualitative and quantitative consistency of the analyses presented by E. Contini et al. (2024a), while delivering more robust results. Notably, FEGA25 provides a more detailed characterization of the fraction of passive galaxies as a function of stellar mass and redshift, and predicts a main sequence of star-forming galaxies more consistent with observations and a more accurate cosmic star formation rate density with redshift. Moreover, it estimates the fraction of hot gas in halos closer to observed values. These findings underscore the importance of a physical mechanism capable of ejecting hot gas beyond the virialized region of dark matter halos without significantly altering the stellar and cold gas components. Such a mechanism is crucial to ensure the proper functioning of other processes, such as cooling and star formation. Since supernova feedback is already modeled at its maximum efficiency, AGN feedback emerges as the natural candidate for this role. |
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| institution | Kabale University |
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| language | English |
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| spelling | doaj-art-e096cbd4159646cea2f2948198aeff982025-08-20T03:32:18ZengIOP PublishingThe Astrophysical Journal Supplement Series0067-00492025-01-0127911810.3847/1538-4365/addb4bA Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection ModesEmanuele Contini0https://orcid.org/0000-0002-2873-8598Sukyoung K. Yi1https://orcid.org/0000-0002-4556-2619Jinsu Rhee2https://orcid.org/0000-0002-0184-9589Seyoung Jeon3Department of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.com, yi@yonsei.ac.krDepartment of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.com, yi@yonsei.ac.krDepartment of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.com, yi@yonsei.ac.kr; Korea Astronomy and Space Science Institute , 776, Daedeokdae-ro, Yuseong-gu, Daejeon 34055, Republic of KoreaDepartment of Astronomy and Yonsei University Observatory, Yonsei University , 50 Yonsei-ro, Seodaemun-gu, Seoul 03722, Republic of Korea ; emanuele.contini82@gmail.com, yi@yonsei.ac.krWe build upon the state-of-the-art semianalytic model FEGA24 for the formation and evolution of galaxies, which integrates the latest prescriptions relevant to galaxy formation and evolution, alongside a comprehensive active galactic nuclei (AGN) feedback model. This model incorporates three modes of feedback: negative (preventing excessive cooling), positive (enhancing star formation), and hot gas ejection (expelling gas beyond the virial radius of halos). These modes operate in a coordinated manner: the negative mode regulates the cooling process, the positive mode promotes bursts of star formation, and the hot gas ejection mode expels gas beyond the virial radius when the AGN is sufficiently powerful. Our updated semianalytic model, FEGA25 , retains the qualitative and quantitative consistency of the analyses presented by E. Contini et al. (2024a), while delivering more robust results. Notably, FEGA25 provides a more detailed characterization of the fraction of passive galaxies as a function of stellar mass and redshift, and predicts a main sequence of star-forming galaxies more consistent with observations and a more accurate cosmic star formation rate density with redshift. Moreover, it estimates the fraction of hot gas in halos closer to observed values. These findings underscore the importance of a physical mechanism capable of ejecting hot gas beyond the virialized region of dark matter halos without significantly altering the stellar and cold gas components. Such a mechanism is crucial to ensure the proper functioning of other processes, such as cooling and star formation. Since supernova feedback is already modeled at its maximum efficiency, AGN feedback emerges as the natural candidate for this role.https://doi.org/10.3847/1538-4365/addb4bGalaxy formationGalaxy evolution |
| spellingShingle | Emanuele Contini Sukyoung K. Yi Jinsu Rhee Seyoung Jeon A Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection Modes The Astrophysical Journal Supplement Series Galaxy formation Galaxy evolution |
| title | A Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection Modes |
| title_full | A Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection Modes |
| title_fullStr | A Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection Modes |
| title_full_unstemmed | A Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection Modes |
| title_short | A Full Active Galactic Nuclei Feedback Prescription for Numerical Models: Negative, Positive, and Hot Gas-ejection Modes |
| title_sort | full active galactic nuclei feedback prescription for numerical models negative positive and hot gas ejection modes |
| topic | Galaxy formation Galaxy evolution |
| url | https://doi.org/10.3847/1538-4365/addb4b |
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