The Relationship Between Eddington Ratio and Column Density in U/LIRG AGN
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arXiv
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| Format: | Preprint |
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2025
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| author | Nagarajan-Swenson, Jaya Privon, George C. Evans, Aaron S. Barcos-Muñoz, Loreto Ricci, Claudio Medling, Anne M. U, Vivian Saravia, Alejandro Green, Kara N. Johnstone, Makoto Meza, Gabriela A. |
| author_facet | Nagarajan-Swenson, Jaya Privon, George C. Evans, Aaron S. Barcos-Muñoz, Loreto Ricci, Claudio Medling, Anne M. U, Vivian Saravia, Alejandro Green, Kara N. Johnstone, Makoto Meza, Gabriela A. |
| contents | The local X-ray AGN population appears to follow a growth cycle regulated by the AGN's own radiation, marked by changes in their obscuration and Eddington ratio during accretion events. Because AGN in infrared-selected galaxies are more likely to be Compton-thick and have evidence for over-massive black holes, we explore whether infrared-selected AGN follow the radiation-regulated AGN growth scheme. We calculate the Eddington ratios of nine U/LIRG AGN with dynamical BH mass measurements, finding that though the number of objects is limited, AGN in IR-selected galaxies appear consistent with radiation pressure-regulated growth. We suggest that enlarging the sample of dynamical BH mass measurements in IR-selected systems will provide more stringent tests of whether their AGN are primarily regulated by radiation pressure. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2506_02124 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The Relationship Between Eddington Ratio and Column Density in U/LIRG AGN Nagarajan-Swenson, Jaya Privon, George C. Evans, Aaron S. Barcos-Muñoz, Loreto Ricci, Claudio Medling, Anne M. U, Vivian Saravia, Alejandro Green, Kara N. Johnstone, Makoto Meza, Gabriela A. Astrophysics of Galaxies High Energy Astrophysical Phenomena The local X-ray AGN population appears to follow a growth cycle regulated by the AGN's own radiation, marked by changes in their obscuration and Eddington ratio during accretion events. Because AGN in infrared-selected galaxies are more likely to be Compton-thick and have evidence for over-massive black holes, we explore whether infrared-selected AGN follow the radiation-regulated AGN growth scheme. We calculate the Eddington ratios of nine U/LIRG AGN with dynamical BH mass measurements, finding that though the number of objects is limited, AGN in IR-selected galaxies appear consistent with radiation pressure-regulated growth. We suggest that enlarging the sample of dynamical BH mass measurements in IR-selected systems will provide more stringent tests of whether their AGN are primarily regulated by radiation pressure. |
| title | The Relationship Between Eddington Ratio and Column Density in U/LIRG AGN |
| topic | Astrophysics of Galaxies High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2506.02124 |