Observational astronomy of tidal disruption events (TDEs) began with the detection of X-ray
flares from quiescent galaxies during the ROSAT all-sky survey of 1990–1991. The flares …

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In the past two decades, high-amplitude electromagnetic outbursts have been detected from
dormant galaxies and often attributed to the tidal disruption of a star by the central black …

We present the drastic transformation of the X-ray properties of the active galactic nucleus
(AGN) 1ES 1927+ 654, following a changing-look event. After the optical/ultraviolet outburst …

Roughly half of the quasiperiodic eruption (QPE) sources in galactic nuclei exhibit a
remarkably regular alternating" long-short" pattern of recurrence times between consecutive …

We propose that the recently observed quasi-periodic eruptions (QPEs) in galactic nuclei
are produced by unstable mass transfer due to Roche lobe overflow of a low-mass main …

Context. GSN 069 is the first galactic nucleus where quasi-periodic eruptions (QPEs) have
been identified in December 2018. These are high-amplitude, soft X-ray bursts recurring …

A star that approaches a supermassive black hole (SMBH) on a circular extreme mass ratio
inspiral (EMRI) can undergo Roche lobe overflow (RLOF), resulting in a phase of long-lived …

Binary supermassive black hole (SMBH) systems result from galaxy mergers, and will
eventually coalesce due to gravitational wave (GW) emission if the binary separation can be …

X-ray quasi-periodic eruptions (QPEs) were discovered recently in active galaxies with an
unknown driving mechanism. Under the assumption that QPEs are caused by star–disk …