Work

Numerical modelling the mass feeding rates on to accretion-modified stars embedded within AGN discs

Year: 2025

Type: article

Abstract: ABSTRACT Accretion discs surrounding supermassive black holes can potentially form stars within the self-gravitating region. These stars undergo high accretion rates because of the dense environment of the active galactic nuclei (AGNs) accretion disc. The vorticity of the AGN disc may influence the ultimate mass feeding rate towards the star. In our study, we simulate mass feeding rates on to stars at different AGN disc thicknesses through 3D numerical models to explore the relationship between feeding rates and the thermal mass of the star ($q_{\rm th}$), defined as the ratio of the star’s Bondi radius to the AGN disc thickness. Our findings indicate that disc shearing with angular momentum can notably decrease the feeding rate, and we provide an approximate formula that links the feeding rate based on the angular momentum of the surrounding gas and the thermal mass $q_{\rm th}$. Lastly, we examine the potential feedback of the rapidly accreting stars on the AGN disc and their subsequent evolution.

Source: Monthly Notices of the Royal Astronomical Society

DOI: 10.1093/mnras/staf841

Authors: Yang Luo, Jian-Min Wang

Institutions: Yunnan University, Chinese Academy of Sciences, Institute of High Energy Physics, National Astronomical Observatories, University of Chinese Academy of Sciences

Language: English

Topic: Astrophysical Phenomena and Observations

Subfield: Astronomy and Astrophysics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $3,046

Funders: National Natural Science Foundation of China, Yunnan University