Radio observations of H I in UGC 2885, the largest identified SC galaxy

Details Radio observations of H I in UGC 2885, the largest identified SC galaxy Radio observations of H I in UGC 2885, the largest identified SC galaxy

May 1985

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1985a%26a...146..213r&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 146, no. 2, May 1985, p. 213-222.

Astronomy and Astrophysics

Astrophysics

30

Astronomical Spectroscopy, Galactic Structure, Hydrogen Clouds, Radio Spectra, Spiral Galaxies, Astronomical Maps, Centimeter Waves, Galactic Rotation, Neutral Gases, Radii, Velocity Distribution, Visible Spectrum

Scientific paper

Observations of the distribution and motions of H I in the giant Sc galaxy UGC 2885 confirm that it is an extremely regular and symmetric system. Spiral structure is clearly present in H I, corresponding closely to that seen in the optical. Analysis of the velocity data results in a rotation curve which agrees with the optical results. The authors present a simple interpretation for the observed spiral structure and rotation curve in terms of a single dominant two-armed spiral mode. The extent of the spiral arms indicates a corotation radius of approximately 45 kpc, with the spiral wave extending from the inner Lindblad resonance through corotation to the outer Lindblad resonance.

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