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Date and Time of the Query: 2019-06-27 T06:09:18 PDT
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For refcode 2006ApJ...649..181S:
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2006ApJ...649..181S Molecular Gas Dynamics in NGC 6946: A Bar-driven Nuclear Starburst "Caught in the Act" Eva Schinnerer, Torsten Boeker, Eric Emsellem, and Ute Lisenfeld Abstract. We present high angular resolution (~1" and 0.6") millimeter interferometric observations of the ^12^CO(1 -- 0) and ^12^CO(2 -- 1) line emission in the central 300 pc of the late-type spiral galaxy NGC 6946. The data, obtained with the IRAM Plateau de Bure Interferometer (PdBI), allow the first detection of a molecular gas spiral in the inner ~10" (270 pc) with a large concentration of molecular gas (M_H_2__~1.6x10^7^M_sun_) within the inner 60 pc. This nuclear clump shows evidence for a ringlike geometry with a radius of ~10 pc as inferred from the position-velocity diagrams. Both the distribution of the molecular gas and its kinematics can be well explained by the influence of an inner stellar bar of about 400 pc length. A qualitative model of the expected gas flow shows that streaming motions along the leading sides of this bar are a plausible explanation for the high nuclear gas density. Thus, NGC 6946 is a prime example of molecular gas kinematics being driven by a small-scale, secondary stellar bar. Key words: Galaxies: Individual: NGC 6946, Galaxies: ISM, Galaxies: Kinematics and Dynamics, Galaxies: Nuclei
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