AT2022cmc: a Tidal Disruption Event with Two-component Jet in a Bondi-profile Circumnuclear Medium
arXiv (Cornell University)(2023)
摘要
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∼ 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∝ 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 a similar jet physics to
well-studied jetted TDE Sw J1644+57.
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关键词
tidal disruption event,two-component,bondi-profile
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