New high resolution radio observations of NGC 4258. II - NGC 4258 as a spiral galaxy

Details New high resolution radio observations of NGC 4258. II - NGC 4258 as a spiral galaxy New high resolution radio observations of NGC 4258. II - NGC 4258 as a spiral galaxy

Oct 1980

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1980a%26a....90..123v&link_type=abstract

Astronomy and Astrophysics, vol. 90, no. 1-2, Oct. 1980, p. 123-133. Research supported by the Nederlandse Organisatie voor Zui

Astronomy and Astrophysics

Astronomy

65

Barred Galaxies, Galactic Structure, Hydrogen Clouds, Radio Astronomy, Spiral Galaxies, Galactic Rotation, Hydrogen Atoms, Signal To Noise Ratios, Velocity Distribution

Scientific paper

It is demonstrated that the H I in the large, nearby spiral NGC 4258 behaves very much as expected for a normal SAB galaxy, notwithstanding the presence of a pair of anomalous arms indicating some kind of violent activity. The large angular dimensions of NGC 4258 and the good signal-to-noise ratio of the observations allow a detailed study of the properties of the underlying, unperturbed part of the galaxy. Strong evidence for the presence of a bar is found, as well as indications of a high pattern speed, putting corotation well inside the optically observable disk.

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