Astronomy and Astrophysics – Astronomy
Scientific paper
Oct 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990aj....100.1086t&link_type=abstract
Astronomical Journal (ISSN 0004-6256), vol. 100, Oct. 1990, p. 1086-1090.
Astronomy and Astrophysics
Astronomy
10
Carbon Monoxide, Galactic Structure, Radio Emission, Ring Galaxies, Spiral Galaxies, Molecular Clouds, Molecular Gases, Radio Astronomy
Scientific paper
A CO emission line has been detected in the polar-ring S0 galaxy NGC 2685 and the possible origin of the circumnuclear molecular gas is discussed. It is suggested that the gas has been fed by the helix structure and may have little relation to the star-forming activity of the galaxy. As a formation mechanism of the helix and the faint outer ring of NGC 2685, a possibility of interaction with a distant partner UGC 4683 is suggested. The age of the helix and the outer ring is estimated to be more than 1 billion years, since such an interval of time is necessary for the formation of the ring structures and for the accumulation of molecular gas in the central 820 pc region of the galaxy. The accretion rate is estimated to be about 0.01 solar mass/yr.
Nakai Naomasa
Sofue Yoshiaki
Taniguchi Yoshiaki
Wakamatsu Ken'ichi
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