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Please use this identifier to cite or link to this item: http://hdl.handle.net/10481/28414

Title: Molecular Gas Dynamics in NGC 6946: a Bar-driven Nuclear Starburst "Caught in the Act"
Authors: Shinnerer, E.
Böker, Torsten
Emsellem, E.
Lisenfeld, Ute
Issue Date: 2006
Abstract: We present high angular resolution ~1" and 0.6" mm-interferometric observations of the 12CO(1-0) and 12CO(2-1) line emission in the central 300pc of the late-type spiral galaxy NGC6946. The data, obtained with the IRAM Plateau de Bure Interferometer (PdBI), allow the first detection of a molecular gas spiral in the inner ~10" (270pc) with a large concentration of molecular gas (M(H_2) ~1.6x10^7M_sun) within the inner 60pc. This nuclear clump shows evidence for a ring-like geometry with a radius of ~10pc as inferred from the p-v diagrams. Both the distribution of the molecular gas as well as its kinematics can be well explained by the influence of an inner stellar bar of about 400pc 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, NGC6946 is a prime example of molecular gas kinematics being driven by a small-scale, secondary stellar bar.
Sponsorship: U. L. acknowledges support by the Spanish Ministry of Education, via the research projects AYA 2005-07516-C02-01, ESP 2004-06870-C02-02, and the Junta de Andalucía.
Publisher: American Astronomical Society; Institute of Physics (IOP)
Keywords: Galaxies
NGC 6946
ISM
Kinematics and dynamics
Nuclei
URI: http://hdl.handle.net/10481/28414
ISSN: 0004-637X
1538-4357
Rights : Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License
Citation: Shinnerer, E.; et al. Molecular Gas Dynamics in NGC 6946: a Bar-driven Nuclear Starburst "Caught in the Act". Astrophysical Journal, 649(1): 181-200 (2006). [http://hdl.handle.net/10481/28414]
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