The Relationship Between Eddington Ratio and Column Density in U/LIRG AGN

Abstract The local X-ray Active Galactic Nuclei (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 (Ultra)Luminous InfraRed Galaxy 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.

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Publication Details

Journal
Research Notes of the AAS
Published
2025-05-30
DOI
https://doi.org/10.3847/2515-5172/adddc0
Primary Topic
Radio Astronomy Observations and Technology
Type
article
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article

The Relationship Between Eddington Ratio and Column Density in U/LIRG AGN

Kara N. Green, Anne M. Medling, U Vivian, Cláudio Ricci et al.
Research Notes of the AAS
Radio Astronomy Observations and Technology
article

The Relationship Between Eddington Ratio and Column Density in U/LIRG AGN

Kara N. Green, Anne M. Medling, U Vivian, Cláudio Ricci, George C. Privon, Alejandro Saravia, Makoto A. Johnstone, A. Evans, Loreto Barcos-Muñoz, Jaya Nagarajan-Swenson, Gabriela A. Meza
article en

Abstract

Abstract The local X-ray Active Galactic Nuclei (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 (Ultra)Luminous InfraRed Galaxy 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.

Research Notes of the AASVol. 9(5)
California Institute of Technology (US), Peking University (CN), University of California, Irvine (US), National Radio Astronomy Observatory (US), University of Florida (US), Kavli Institute for Theoretical Sciences (CN), National Autonomous University of Honduras (HN), Infrared Processing and Analysis Center (US), University of Virginia (US), University of Toledo (US), Universidad Diego Portales (CL)
Openalex Percentile: Top 92%
Radio Astronomy Observations and Technology
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