NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-17 T10:51:19 PDT
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For refcode 1994ApJ...432..496R:
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Copyright by American Astronomical Society. Reproduced by permission
1994ApJ...432..496R COMPACT RADIO CORES IN SEYFERT GALAXIES A. L. ROY School of Physics, University of Sydney 2006, Australia; and Australia Telescope National Facility, CSIRO, PO Box 76, Epping, NSW 2121, Australia AND R. P. NORRIS, M. J. KESTEVEN, E. R. TROUP, AND J. E. REYNOLDS Australia Telescope National Facility, CSIRO, PO Box 76, Epping NSW 2121, Australia Received 1993 December 8; accepted 1994 March 9 ABSTRACT We have observed a sample of 157 Seyfert galaxies with a 275 km baseline radio interferometer to search for compact, high brightness temperature radio emission from the active nucleus. We obtain the surprising result that compact radio cores are much more common in Seyfert 2 than in Seyfert 1 galaxies, which at first seems to be inconsistent with orientation unification schemes. We propose a model, involving optical depth effects in the narrow-line region, which can reconcile our result with the standard unified scheme. Subject headings: galaxies: active - galaxies: Seyfert galaxies: nuclei - radio continuum: galaxies
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