Delayed and fast rising radio flares from an optical and X-ray detected tidal disruption event in the center of a dwarf galaxy
arxiv(2023)
摘要
AT2018cqh is a unique tidal disruption event (TDE) candidate discovered in a
dwarf galaxy. Both the light curve fitting and galaxy scaling relationships
suggest a central black hole mass in the range of 5.9175 days, a flattening
lasting about 544 days, and a phase with another steep rise. The rapid rise in
radio flux coupled with the slow decay in the X-ray emission points to a
delayed launching of outflow, perhaps due to a transition in the accretion
state. However, known accretion models can hardly explain the origins of the
secondary radio flare that is rising even more rapidly in comparison with the
initial one. If confirmed, AT2018cqh would be a rare TDE in a dwarf galaxy
exhibiting optical, X-ray and radio flares. We call for continued
multi-frequency radio observations to monitor its spectral and temporal
evolution, which may help to reveal new physical processes that are not
included in standard TDE models.
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