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Radio Properties of Active Nearby Spiral Galaxies

Published online by Cambridge University Press:  14 August 2015

A. G. de Bruyn
A. G. de Bruyn*
Affiliation:
Hale Observatories, Pasadena, California, USA

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Before reviewing the radio properties of active spiral galaxies it is appropriate, as well as instructive, to think about a working definition of an active galaxy. This may seem a trivial point when we consider classes of objects like Seyfert galaxies or radio galaxies but this is much less so when we inspect the nearby systems. In a sample of nearby galaxies one is likely to encounter much more milder forms of activity than that known from studies of more distant galaxies. This is, of course, due to the fact that the latter have been selectively taken from a much larger reservoir of objects. (Although this may seem a disadvantage from an observational point of view, there are some clear advantages as well. Firstly, we can obtain a much better linear resolution once we have been able to isolate the active nearby galaxies and, secondly, we eventually may hope to learn more about the physical situation that existed prior to the onset of the active period and how the surrounding medium reacts to the activity.)

Type
IV: Nearby Active Galaxies and Their Nuclei
Information
Symposium - International Astronomical Union , Volume 77: Structure and Properties of Nearby Galaxies , 1978 , pp. 205 - 219
Copyright
Copyright © Reidel 1978 

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