NASA/IPAC EXTRAGALACTIC DATABASE
Date and Time of the Query: 2019-06-27 T03:27:11 PDT
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For refcode 1988AJ.....96..841N:
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NED Abstract

Copyright by American Astronomical Society. Reproduced by permission
1988AJ.....96..841N COMPACT RADIO CORES IN THREE SEYFERT GALAXIES: HIGH-RESOLUTION STUDIES OF Mkn 3, Mkn 231, AND Mkn 463 S. G. NEFF Radiosterrenwacht Dwingeloo, Postbus 2, 7990 AA Dwingeloo, The Netherlands and Laboratory for Astronomy and Solar Physics, Goddard Space Flight Center, Code 684.1, Greenbelt, Maryland 20771 J. S. ULVESTAD Jet Propulsion Laboratory, California Institute of Technology, Mail Code 235-700, Pasadena, California 91109 Received 7 January 1988;revised 13 May 1988 ABSTRACT The small-scale morphologies of Mkn 231 and Mkn 463 have been investigated using the European VLBI Network (EVN) at 1.6 GHz and the VLA at 15 and 22 GHz. Mkn 3 has been studied using the EVN at 1.4 and 1.6 GHz. All of the galaxies have a substantial fraction of their core radio flux in linear or elongated structures, typically tens of parsecs in extent. Agreement between the parsec- and kiloparsec-scale position angles of continuum radio emission suggests collimated outflow from the galaxy centers that continues over several orders of magnitude in scale. Supernova rates of order one hundred per year on scales of tens of parsecs are required to explain the nuclear radio emission as the result of bursts of star formation. The luminosities, small extents, and linear morphologies of the radio sources all support the idea that the nuclear radio sources are energized by active galactic nuclei and therefore supports the more general picture of Seyfert galaxy nuclei being low-luminosity quasars. All of the galaxies appear to have undergone violent interactions in the recent past.
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Please click here for ADS abstract

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