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

TL;DR

This paper analyzes the tidal disruption event AT2022cmc, revealing a two-component jet and a Bondi-profile circumnuclear medium, providing insights into jet physics and black hole environments at high redshift.

Contribution

It presents the first detailed modeling of AT2022cmc's circumnuclear medium and jet structure, highlighting a two-component jet and a Bondi-profile density.

Findings

CNM density profile with power-law index ~1.68

Evidence for a two-component jet structure

Consistent with Bondi accretion history

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 environment at high redshift. The newly discovered TDE AT2022cmc ($z\sim 1.193$) providing rich multi-band (X-ray, UV, optical, sub-millimeter, 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 closure relation (CR) test and detailed forward shock model fit with Markov chain Monte Carlo (MCMC) approach to the multi-band (optical, sub-millimeter, and radio) data of AT2022cmc.We find that the CNM density profile of AT2022cmc is $n\propto R^{-k}$ with $k \sim 1.68$, implying a Bondi accretion in history. Furthermore, our model fit result suggests a two-component jet in AT2022cmc, indicating a similar jet physics to well-studied jetted TDE Sw J1644+57.