Astronomy and Astrophysics – Astronomy
Scientific paper
May 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991a%26a...245....7v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 245, no. 1, May 1991, p. 7-26. ZWO-supported research.
Astronomy and Astrophysics
Astronomy
33
Astronomical Spectroscopy, Galactic Structure, H Lines, Mass To Light Ratios, Ring Galaxies, Astronomical Catalogs, Halos, Infrared Astronomy, Star Formation
Scientific paper
Ringed spiral galaxies NGC2273, 4826, and 6217 mapped in the 21-cm H I line with a velocity resolution of 40, 20, and 20 km/s and a spatial resolution of 23 sec by 27 sec, 28 sec by 60 sec, and 13 sec by 14 sec, respectively are discussed. The optical and infrared properties of each galaxy are analyzed along with continuum sources, channel maps and global H I and H2 content, H I distribution and velocity fields, and rotation curve and total mass. Resonance interpretations are considered as well as rings and H I distributions. It is noted that none of the galaxies shows strong evidence for noncircular motions in the H I velocity field. In the cases of NGC2273 and 6217, it is attributed in part to a combination of factors such as unfavorable bar orientation, poor resolution, low inclination, or lack of gas in the bar region. NGC4826 is viewed as unusually H I poor compared to other galaxies of similar Hubble stage.
Buta Ronald J.
Driel Wim van
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