AT2022cmc: A Tidal Disruption Event with a Two-component Jet in a Bondi-profile Circumnuclear Medium

Abstract

A supermassive black hole can launch a relativistic jet when it violently disrupts a star that passes too close. Such jetted tidal disruption events (TDEs) are rare and unique tools to investigate quiescent supermassive black holes, jet physics, and circumnuclear environments at high redshift. The newly discovered TDE AT2022cmc (z ∼ 1.193), providing rich multiband (X-ray, UV, optical, submillimeter, and radio) data, has been interpreted as the fourth on-axis jetted TDE. In this work, we constrain the circumnuclear medium (CNM) density profile with both a closure relation test and detailed forward shock model fit with a Markov Chain Monte Carlo approach to the multiband (optical, submillimeter, and radio) data of AT2022cmc. We find that the CNM density profile of AT2022cmc is n ∝ R −k with k ∼ 1.68, implying a Bondi accretion in history. Furthermore, our model fit result suggests a two-component jet in AT2022cmc, indicating similar jet physics to well-studied jetted TDE Sw J1644+57.

Exploring the Properties of Photosphere and Emission Lines for Tidal Disruption Events Based on the Global Solution of Slim Disk and Winds

“…In our calculations, we find that the mass of the envelope contributed from the pure disk winds is too low (normally less than several percent of the solar mass) to produce the observed peak line luminosities. Therefore, we assume that the initial debris collision also contributes to the outer atmosphere since the possible preexisting circumnuclear medium is even more unclear (Zhou et al 2024).…”