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Large-Amplitude X-Ray Outbursts from Galactic Nuclei: A Systematic Survey using [ITAL]ROSAT[/ITAL] Archival Data
In recent years, luminous X-ray outbursts with variability amplitudes as high as ~ 400 have been serendipitously detected from a small number of active and inactive galaxies. These outbursts may result from the tidal disruptions of stars by supermassive black holes as well as accretion-disk instabilities. In order to place …