Abstract
We report the transition toward a type 1 Seyfert experienced by the classical type 2 Seyfert nucleus in NGC 7582. The transition, found at most 20 days from its maximum peak, presents a unique opportunity to study these rare events in detail. At maximum, the Ha line width is about 12,000 km s 21 . We examine three scenarios that could potentially explain the transition: capture of a star by a supermassive black hole, a reddening change in the surrounding torus, and the radiative onset of a Type IIn supernova exploding in a compact nuclear/ circumnuclear starburst. Subject headings: galaxies: active — galaxies: individual (NGC 7582) — galaxies: Seyfert — galaxies: starburst — supernova remnants
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