Invited Presentation
Self-regulation of black hole accretion via jets in atomic cooling halo
Presenter: Kung-Yi Su (BHI, Harvard University)
The early growth of black holes (BHs) in atomic cooling halos is likely influenced by feedback on the surrounding gas. While the effects of radiative feedback are well-documented, mechanical feedback, particularly from AGN jets, has been comparatively less explored. Building on our previous work that examined the growth of a 100-solar-mass black hole in a constant density environment regulated by AGN jets, we have expanded the black hole mass range from 1 to 10,000 solar masses and adopted a more realistic density profile for atomic cooling halos. We provide an analytic models for jet cocoon propagation and feedback regulation. We also identify several critical radii—namely, the terminal radius of jet cocoon propagation, the isotropization radius of the jet cocoon, and the core radius of the atomic cooling halo—that are crucial in determining black hole growth, given specific gas properties and jet feedback models. In a significant portion of the parameter space, our findings show that jet feedback substantially disrupts the halo-core gas density during the initial feedback episode, halting black hole growth beyond 10,000 solar masses. Conversely, conditions characterized by low jet velocities and high gas densities enable sustained black hole growth over extended periods. We have identified the parameter space that allows a stellar-mass black hole to grow into a supermassive black hole at high redshift by accreting gas from an atomic cooling halo.
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