Astronomy and Astrophysics – Astronomy
Scientific paper
Nov 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991apj...381..110p&link_type=abstract
Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 381, Nov. 1, 1991, p. 110-117. Research supported by University of Illinois
Astronomy and Astrophysics
Astronomy
29
Interstellar Gas, Molecular Clouds, Radio Jets (Astronomy), Carbon Monoxide, Microwave Interferometers, Millimeter Waves
Scientific paper
The CO (J = 1 - 0) emission from the central 1 arcmin of NGC 4258, a SABbc spiral galaxy with a pair of anomalous arms, was mapped using the Owens Valley millimeter-wave interferometer. The CO emission is found to arise from a ringlike structure, and the bulk of the detected CO appears to coincide with dust features seen in optical images. The CO distribution also appears to confine the inner part of the anomalous H-alpha arm in NGC 4258. To account for the unusual velocity field of the CO emission, a simple kinematic model for the motion of the molecular gas that superposes expansion away from the galaxy's center on top of the elliptical motion is obtained. A feature in the CO emission is identified whose motion is perturbed with respect to this model and suggest that this deviation is evidence for a deflection of the line-emitting jet by a dense molecular cloud.
Lo Kwok Yung
Martin Pierre
Noreau Louis
Plante Raymond Louis
ROY Jean-Rene
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