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CO Emission along the Anomalous Arms of NGC 4258

Published online by Cambridge University Press:  03 August 2017

M. Krause ,
P. Cox ,
J.A. Garcia-Barreto  and
D. Downes
M. Krause
Affiliation:
Max-Planck-Institut für Radioastronomie Auf dem Hügel 69, 5300 Bonn, FRG
P. Cox
Affiliation:
Observatoire de Marseille 2 Pl. Leverrier, 13248 Marseille Cedex 4, France
J.A. Garcia-Barreto
Affiliation:
IRAM, 38406 St-Martin-d'Hères, France
D. Downes
Affiliation:
IRAM, 38406 St-Martin-d'Hères, France

Extract

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The spiral galaxy NGC 4258 is known for its anomalous Hα and nonthermal radio arms perpendicular to the normal spiral arms (van der Kruit et al., 1972). Several models have been proposed to explain this phenomenon and its origin is most probably to be sought in the past activity of the nucleus of NGC 4258. Most of the characteristics of the anomalous arms, such as the symmetry with respect to the center, or the properties of the emission lines (pure Hα line emission with no continuum, line ratio between Hα and [NII]) are reminiscent of the optical and radio jets currently observed in active galaxies.

Type
V- CO in Galactic Disks
Information
Symposium - International Astronomical Union , Volume 146: Dynamics of Galaxies and their Molecular Cloud Distributions , 1991 , pp. 166
Copyright
Copyright © Kluwer 1991