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Uv Galaxies

Published online by Cambridge University Press:  30 March 2016

E. Ye Khachikian
E. Ye Khachikian*
Affiliation:
Byurakan Astrophysical Observatory, Yerevan State University, Armenia, USSR

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The systematical statement of the concept of the activity of the nuclei of galaxies was first made public by Ambartsumian about 25 years ago (Ambartsumian 1958, 1962, 1965). Since 1965 he has been advancing and developing the idea of the basic role of the nuclei of galaxies in their life and evolution.

According to Ambartsumian the “activity” of the nuclei of galaxies manifests itself mainly in the following forms:

  1. 1. Outflow of ordinary gas matter (in form of jets or clouds) from the nuclear region at the velocity of up to hundreds of kilometres per second.

  2. 2. Continuous emission of the flux of relativistic particles or other agents, producing high energy particles, as a result of which a radio halo may form around the nucleus.

  3. 3. Eruptive ejections of gas matter (M82 type).

  4. 4. Eruptive ejections of concentrations of relativistic plasma (NGC 4486, 5128, etc.)

I should like to emphasize on the form of activity which says:

  • 5. Ejection of compact blue condensations with an absolute magnitude of the order of luminosity of dward galaxies (NGC 3561, IC 1182). Here the division of the nucleus into two or more comparable componentsis also presumed; initiating the formation of multiple galaxies.

Type
Joint Discussions
Information
Highlights of Astronomy , Volume 6: Highlights of Astronomy. As presented at the XVIIIth General Assembly of the IAU, 1982 , 1983 , pp. 459 - 466
Copyright
Copyright © Reidel 1983

References

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