van der Laan, T. P. R. and Schinnerer, E. and Boone, F. and García-Burillo, S. and Combes, F. and Haan, S. and Leon, S. and Hunt, L. and Baker, A. J. (2011) Molecular gas in NUclei of GAlaxies (NUGA). XV. Molecular gas kinematics in the inner 3 kpc of NGC 6951. Astronomy and Astrophysics, 529 . A45. ISSN 0004-6361 http://resolver.caltech.edu/CaltechAUTHORS:20110504-113233633
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Within the NUclei of GAlaxies (NUGA) project we have obtained IRAM PdBI and 30 m ^(12)CO(1−0) and ^(12)CO(2−1) observations of the spiral galaxy NGC 6951. Previous work shows that there is indirect evidence of gas inflow from 3 kpc down to small radii: a large-scale stellar bar, a prominent starburst ring (r ≈ 580 pc) and a LINER/Seyfert 2 nucleus. In this paper we study the gas kinematics as traced by the CO line emission in detail. We quantify the influence of the large-scale stellar bar by constructing an analytical model of the evolution of gas particles in a barred potential. From this model gravitational torques and mass accumulation rates are computed. We compare our model-based gravitational torque results with previous observationally-based ones. The model also shows that the large-scale stellar bar is indeed the dominant force for driving the gas inward, to the starburst ring. Inside the ring itself a nuclear stellar oval might play an important role. Detailed analysis of the CO gas kinematics there shows that emission arises from two co-spatial, but kinematically distinct components at several locations. The main emission component can always be related to the overall bar-driven gas kinematics. The second component exhibits velocities that are larger than expected for gas on stable orbits, has a molecular gas mass of 1.8 × 10^6 M_⊙, is very likely connected to the nuclear stellar oval, and is consistent with inflowing motion towards the very center. This may form the last link in the chain of gas inflow towards the active galactic nucleus in NGC 6951.
|Additional Information:||© 2011 ESO. Article published by EDP Sciences. Received: 23 March 2010; Accepted: 18 February 2011. Published online 29 March 2011. Based on observations carried out with the IRAM Plateau de Bure Interferometer and 30 m telescope. IRAM is supported by INSU/CNRS (France), MPG (Germany) and IGN (Spain). T.v.d.L. acknowledges DFG-funding (grant SCHI 536/2-3).|
|Subject Keywords:||galaxies: individual: NGC6951; galaxies: nuclei; galaxies: ISM; galaxies: Seyfert|
|Official Citation:||Molecular gas in NUclei of GAlaxies (NUGA) - XV. Molecular gas kinematics in the inner 3 kpc of NGC 6951 T. P. R. van der Laan, E. Schinnerer, F. Boone, S. García-Burillo, F. Combes, S. Haan, S. Leon, L. Hunt and A. J. Baker A&A 529 A45 (2011) DOI: 10.1051/0004-6361/201014488|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Jason Perez|
|Deposited On:||05 May 2011 17:10|
|Last Modified:||26 Dec 2012 13:12|
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