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The Astrophysical Journal, 519:L123L126, 1999 July 10 1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.
 

Summary: L123
The Astrophysical Journal, 519:L123­L126, 1999 July 10
1999. The American Astronomical Society. All rights reserved. Printed in U.S.A.
SEYFERT 1 MUTATION OF THE CLASSICAL SEYFERT 2 NUCLEUS NGC 75821
Itziar Aretxaga,2
B. Joguet,3,4
D. Kunth,4
J. Melnick,3
and R. J. Terlevich5
Received 1999 January 25; accepted 1999 May 12; published 1999 June 11
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 1
. 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

  

Source: Aretxaga, Itziar - Instituto Nacional de Astrofísica Óptica y Electrónica

 

Collections: Physics