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Formation of Bi-Polar Spiral Features in Galactic Nuclei

Published online by Cambridge University Press:  07 August 2017

Paris Pişmiş  and
Edmundo Moreno
Paris Pişmiş
Affiliation:
Instituto de Astronomía, Universidad Nal. Autónoma de México, Apdo. Postal 70-264, México 04510, D.F.
Edmundo Moreno
Affiliation:
Instituto de Astronomía, Universidad Nal. Autónoma de México, Apdo. Postal 70-264, México 04510, D.F.

Extract

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In earlier communications we have called attention to the existence of very tight spiral formations in the nuclei of some galaxies, particularly of the early type barred spirals, proposing a mechanism for their formation (Pişmiş and Moreno 1984). These kiloparsec-scale structures are loosely termed “rings” but their overall morphology suggests strongly that the image is a tightly wound double spiral usually delineated by knots of emitting material, “hot-spots”. A striking characteristic of these spirals is their very high luminosity compared to the outer regions of the galaxy. 26 galaxies with “nuclear” spirals are listed by Buta, thesis. A systematic search with short exposure high resolution imagery may reveal many more nuclear spirals. NGC 4736 (Sb) though not a barred spiral has a well defined inner spiral delineated by very luminous H II regions.

Type
Part 8: Relationships of Nucleus, Galaxy and Environment
Information
Symposium - International Astronomical Union , Volume 134: Active Galactic Nuclei , 1989 , pp. 488 - 489
Copyright
Copyright © Kluwer 1989 

References

García Barreto, J.A. and Pişmiş, P. 1985, Bull. A.A.S., 17, 893.Google Scholar
Pişmiş, P. 1963, Bol. Obs. Tonantzintla y Tacubaya 3, 119.Google Scholar
Pişmiş, P. 1987, IAU Symposium No. 131.Google Scholar
Pişmiş, P. and Moreno, E. 1984, Astrofizika 20, 7.Google Scholar
Lindblad, P.O., and Jörsäter, S. 1981, Astron. and Astrophys. 97, 56.Google Scholar
van der Kruit, P.C. 1976, Astron. and Astrophys. 52, 85.Google Scholar
Wilson, A.S. and Ulvestad, J.S. 1982, Ap. J. 263, 576.Google Scholar