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Tight Nuclear Spirals: Observational Evidence of Nuclear Activity

Published online by Cambridge University Press:  04 August 2017

P. Pişmiş  and
E. Moreno
P. Pişmiş
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México
E. Moreno
Affiliation:
Instituto de Astronomía, Universidad Nacional Autónoma de México

Abstract

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It is argued that the tightly wound spiral structure in the nuclei of some galaxies -generally referred to as rings- provides evidence of nuclear activity. It is shown that such spirals are the loci of plasma ejected in a bi-polar fashion from the equator of a rotating nucleus and funneled by a magnetic field. The equation of the loci is derived and applied to the nuclear spiral of NGC 4736. The observed rotational and angle-dependent ejection velocities, as well as polarization of non-thermal continua give support to our model.

Type
VII. Low Level Activity and Intermediate Objects
Information
Symposium - International Astronomical Union , Volume 121: Observational Evidences of Activity of Galaxies , 1987 , pp. 477 - 482
Copyright
Copyright © Reidel 1987 

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