The short and regular bursts in massive black hole systems known as quasi-periodic eruptions have intrigued — and puzzled — astronomers since their discovery. Two such sources recently discovered by SRG/eROSITA suggest that they could be the electromagnetic counterparts to a type of gravitational-wave sources called extreme mass-ratio inspirals.
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Liu, T. Massive black holes flaring up time and again. Nat Astron 5, 438–439 (2021). https://doi.org/10.1038/s41550-021-01366-4
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DOI: https://doi.org/10.1038/s41550-021-01366-4
