Hostname: page-component-745bb68f8f-l4dxg Total loading time: 0 Render date: 2025-01-11T02:49:21.739Z Has data issue: false hasContentIssue false
  • English
  • Français

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

Core share and HTML view are not available for this content. However, as you have access to this content, a full PDF is available via the ‘Save PDF’ action button.

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 

References

García-Barreto, J.A., and Pismis, P. 1985, Bull. AAS 17, 893.Google Scholar
García-Barreto, J.A., and Pismis, P. 1987, in Proceedings of IAU Symposium No. 115.Google Scholar
Jörsäter, S. 1979, Photometry Kinematics and Dynamics of Galaxies, ed. Evans, D.J., p. 197.Google Scholar
Kruit, P.C. van der, 1976, Astron. Astrophys. 52, 85.Google Scholar
Pismis, P. 1961, Bol. Obs. Tonantz. y Tacubaya 3, 3.Google Scholar
Pismis, P. 1979, in Proceedings of IAU Symposium No. 84, p.Google Scholar
Pismis, P. 1986, Rev. Mexicana Astron. Astrof. 12, 79.Google Scholar
Pismis, P. 1986, in Proceedings Trieste Symp. on Evolution of Active Galactic Nuclei, p. 679.Google Scholar
Pismis, P., and Moreno, E. 1984, Astrofizika, Vol. 20, p. 7.Google Scholar