Speaker
Description
This study investigates the origin of Odd Radio Circles (ORCs) by modeling them as remnants of active galactic nucleus (AGN) feedback using the JET semi-analytical framework. Motivated by observed host galaxy properties and recent simulations suggesting that ORCs represent relics of AGN activity following a phase of rapid supermassive black hole (SMBH) growth, we identify candidate hosts with stellar masses of 10^11-10^11.5 M_⊙ and black hole masses of 10^7.5-10^8.7 M_⊙ in a radiatively inefficient accretion state. By applying the Sheth-Tormen halo mass function, we calculate predicted numbers as a function of redshift, finding a stable distribution within 10^12-10^13 M_⊙ halos for 1 ≤ z ≤ 3. Crucially, the model yields predicted number densities at z < 1 that are of the same order of magnitude as observed counts and recent estimates (de Gasperin et al. 2026), with predicted numbers as a function of redshift providing a predictive roadmap for future deep-field radio surveys. These findings strongly support the hypothesis that ORCs are long-lived remnants of powerful AGN jets.
| Participate the oral/poster presentation award competition | Yes |
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