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Additional data obtained by the Atacama Large Millimeter/submillimeter Array (ALMA), as well as the ATA and SMA observatories, were also used by the team in their research.
Based on data obtained by Hebrew University researchers using the AMI-LA observations, the peculiar radio emissions generated by this TDE were revealed.
These emissions formed one of the most important components in the broader discovery and offered important clues about the physics underlying the event.

A Pair of Massive Radio Flares
According to the team’s observations, data revealed a pair of distinctive radio flares that were both massive and evolved far more quickly than any observed in the past.
Significantly, the data indicated that the outflow of material from the black hole coinciding with these emissions occurred several months after the death of the star in question, rather than occurring at or near the time of its destruction.

This unique observation suggested that the processes underlying stellar consumption by black holes during such TDEs are far more complex and occur over a longer period than previously expected.
Additionally, models employed by the team showed that two separate ejection events occurred, each separated by several months, which suggests that black holes are able to enter periods of dormancy, after which they reawaken in the aftermath of TDEs and release additional material.

An Unprecedented Observation
“Never before have we seen such bright radio emission from a black hole tearing apart a star, away from a galaxy’s center, and evolving this fast,” Dr. Sfaradi said.
“It changes how we think about black holes and their behavior.” Professor Assaf Horesh of Hebrew University in Jerusalem called the discovery “one of the [most] fascinating discoveries I’ve been part of.”

In the past, Sfaradi studied under Horesh as a graduate student, and their recent work marks the culmination of several years of investigations into such astrophysical phenomena.