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Large-Amplitude X-Ray Outbursts from Galactic Nuclei: A Systematic Survey using ROSAT Archival Data

Brandt, W. N.; Eracleous, Michael; Boller, Th. +1 more

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 the first reliable const…