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infrared emission in seyfert 2 galaxies - reprocessed radiation from a dusty torus?New and existing data for a sample of nine Seyfert 2 galaxies with known 'ionization cones' are combined in order to test whether collimation results from shadowing of radiation from a small isotropic nuclear source by a thick dusty torus. The number of ionizing photons emitted by the compact nucleus is calculated from the emission-line ratios measured for gas within the cones. On the assumption that this compact nuclear source radiates isotropically, the optical-UV power incident on the torus, which is expected to be reradiated in the IR, is determined. It is found that the observed IRAS luminosities are consistent with the torus model in eight of the nine objects with sufficient data to perform the calculation. It is concluded that the data are generally consistent with collimation and reradiation by a dusty torus.
Document ID
19920074294
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Storchi-Bergmann, Thaisa
(Universidade Federal do Rio Grande do Sul, Porto Alegre, Brazil; Maryland, University College Park, United States)
Mulchaey, John S.
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Wilson, Andrew S.
(Maryland, University College Park; Space Telescope Science Institute, Baltimore, United States)
Date Acquired
August 15, 2013
Publication Date
August 20, 1992
Publication Information
Publication: Astrophysical Journal, Part 2 - Letters
Volume: 395
Issue: 2 Au
ISSN: 0004-637X
Subject Category
ASTROPHYSICS
Funding Number(s)
CONTRACT_GRANT: NAGW-2689
CONTRACT_GRANT: NAG5-1886
CONTRACT_GRANT: NAG5-1079
CONTRACT_GRANT: NAG8-793
Distribution Limits
Public
Copyright
Other