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Double Nuclei and “TDGs”: Colliding or Activity of Nucleus Monster?

Published online by Cambridge University Press:  26 May 2016

Edward Khachikian  and
Yervant Terzian
Edward Khachikian
Affiliation:
Ambartsumian Byurakan Astrophysical Observatory, Armenia
Yervant Terzian
Affiliation:
Cornell University, USA

Abstract

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It is known that among active galaxies (AG) with strong emission lines (UV-galaxies, Sy 1 and Sy2, Markarian and Kazarian galaxies, Radio-galaxies, QSO's host galaxies and so on) there are large per cent of objects with double and multiple nucleus. The common sizes and volumes of these nuclei are on the order of a few hundred parsecs or kilo-parsecs. In fact these are not double galaxies or clusters of galaxies as many of astronomers believe, but just the complicated nucleus of AG. The problem is: what are the nature and the birth of these objects? There are in fact two basic suppositions in the subject: (a) The complicated nuclei are the result of merging or colliding of two or more galaxies, or: (b) They are the results of nuclear activity. The results of detailed spectroscopic observations of a number of ”tidal galaxies”, carried out with the 5m Palomar telescope, 2.6m telescope of Ambartsumian Byurakan astrophysical observatory (multi-pupil spectroscopy with Tiger receiver) and 6m telescope of Special Astrophysical observatory of Russia are presented. It is shown that in many cases the ”tidal dwarf galaxies ”(or actually complicated nucleus) are the result of galactic nuclear activity.

Type
Part 3. Ejection and Outflow
Information
Symposium - International Astronomical Union , Volume 217: Recycling Intergalactic and Interslettar Matter , 2004 , pp. 458 - 463
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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