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Survey of Milliarcsec Structure in Eight Seyfert Galaxies: Results on NGC 1068 and NGC 4151

Published online by Cambridge University Press:  12 April 2016

A. L. Roy ,
J. S. Ulvestad ,
E. J. M. Colbert ,
A. S. Wilson  and
R. P. Norris
A. L. Roy
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, U.S.A.
J. S. Ulvestad
Affiliation:
National Radio Astronomy Observatory, Socorro, NM, U.S.A.
E. J. M. Colbert
Affiliation:
Space Telescope Science Institute, Baltimore, MD, U.S.A.; and Department of Astronomy, University of Maryland, College Park, MD, U.S.A.
A. S. Wilson
Affiliation:
Space Telescope Science Institute, Baltimore, MD, U.S.A.; and Department of Astronomy, University of Maryland, College Park, MD, U.S.A.
R. P. Norris
Affiliation:
Australia Telescope National Facility, Epping, NSW, Australia

Abstract

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We are surveying eight nearby Seyfert galaxies (four Sy1s and four Sy2s) that have compact radio cores, using the VLBA. We are interested in parsec-scale morphology and low-frequency absorption effects, and so are observing four frequencies (1.6, 4.8, 8.4 and 15 GHz) to get spectral-index diagnostics. In this paper, we present results on two galaxies, NGC 1068 and NGC 4151. NGC 4151 shows a curved radio jet on the sub-parsec scale, with the smallest scale structure misaligned by 55° from the jet on scales of parsecs to hundreds of parsecs. NGC 1068 contains several components in the inner tens of parsecs, with those components showing a variety of absorption and resolution effects.

Type
Research Article
Information
International Astronomical Union Colloquium , Volume 164: Radio Emission from Galactic and Extragalactic Compact Sources , 1998 , pp. 301 - 302
Copyright
Copyright © Astronomical Society of the Pacific 1998

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