Archival X-ray data reveal quasi-periodic eruptions (QPEs) in binary systems on timescales of several hours to several months. The discovery of QPEs in Swift J0230 data with periods of weeks may help ...

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Quasi-periodic eruptions (QPEs) are rapid, recurring X-ray bursts from supermassive black holes, believed to result from interactions between accretion disks and surrounding matter. The galaxy SDSS1335+0728, previously stable for two decades, exhibited an increase in optical brightness in December 2019, followed by persistent active galactic nucleus (AGN)-like variability for 5 yr, suggesting the activation of a ~106-M⊙ black hole. Since February 2024, X-ray emission has been detected, revealing extreme ~4.5-d QPEs with high fluxes and amplitudes, long timescales, large integrated energies and a ~25-d superperiod. Low-significance UV variations are reported, probably related to the long timescales and large radii from which the emission originates. This discovery broadens the possible formation channels for QPEs, suggesting that they are linked not solely to tidal disruption events but more generally to newly formed accretion flows, which we are witnessing in real time in a turn-on AGN candidate. In February 2024, rapid, recurring X-ray bursts (quasi-periodic eruptions) were detected from the black hole within galaxy SDSS1335+0728. Named Ansky, the event features day-and-a-half-long flares and extreme energy levels, challenging existing models.

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Astronomers are unraveling the mystery behind Ansky, a black hole system emitting powerful, repeating X-ray bursts called QPEs. These outbursts may result from a small object colliding with a gas disk,...

In February 2024, rapid, recurring X-ray bursts (quasi-periodic eruptions) were detected from the black hole within galaxy SDSS1335+0728. Named Ansky, the event features day-and-a-half-long flares and...

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