Astronomy and Astrophysics – Astronomy
Scientific paper
Jan 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987apj...312l..39m&link_type=abstract
Astrophysical Journal, Part 2 - Letters to the Editor (ISSN 0004-637X), vol. 312, Jan. 15, 1987, p. L39-L43.
Astronomy and Astrophysics
Astronomy
61
Carbon Monoxide, Galactic Nuclei, Infrared Sources (Astronomy), Molecular Clouds, Spiral Galaxies, Star Formation, Neutral Gases
Scientific paper
The Owens Valley Millimeter Interferometer has been used to map the CO emission in the nucleus of NGC 1068 at 6-arcsec resolution (500 pc). Approximately 50 percent of the total CO emission within the central 6 kpc is contained in a ring (or arms) at R = 0.9 - 2.4 kpc near the outer edge of the inner disk, where IR observations have shown a high rate of massive star formation. The CO kinematics indicate mean circular and expansion velocities of 164 and 71 km/s, respectively for the ring assuming a major axis position angle of 55 deg. (For a major axis PA = 82 deg, the circular velocity is 185 km/s and the expansion velocity is less than 20 km/s.) The mass of molecular clouds within this region is approximately 4 x 10 to the 9th solar mass. It is proposed that the ring has formed of gas collected by the action of a central stellar bar; the infall of this gas may have been triggered by a close encounter of merger with another galaxy.
Myers Steven T.
Scoville Nicholas Z.
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