EDP Sciences
Free access
Issue
A&A
Volume 386, Number 1, April IV 2002
Page(s) 42 - 59
Section Extragalactic astronomy
DOI http://dx.doi.org/10.1051/0004-6361:20020045


A&A 386, 42-59 (2002)
DOI: 10.1051/0004-6361:20020045

Fabry-Perot observations of the ionized gas in the spiral galaxy NGC 6951

M. Rozas1, 2, M. Relaño1, A. Zurita1 and J. E. Beckman1, 3

1  Instituto de Astrofísica de Canarias, E-38200 La Laguna, Tenerife, Canarias, Spain
2  Observatorio Astronómico Nacional (UNAM), Ensenada, B.C., México
3  Consejo Superior de Investigaciones Cientificas, Spain

(Received 27 November 2000 / Accepted 2 January 2002 )

Abstract
We present two dimensional kinematic observations at high angular and velocity resolution measured via the H $\alpha$ emission line in the active barred spiral NGC 6951, obtained using the TAURUS II Fabry-Perot system on the 4.2 m William Herschel Telescope. From the radial velocity map we produced the rotation curve, which has a rapidly rising inner portion, and then remains remarkably flat to large radii. Subtracting a two-dimensional projected model of this rotation from the observed map yields a residual velocity map which shows significant non-circular motions, above all in the circumnuclear zone, where they reach projected values of 45 km s -1. The kinematic and morphological properties of this zone, a narrow well-defined annular region, point to inflow of gas resulting from perturbation in the stream-lined gas flow due to the bar, as predicted in dynamical models. The overall gas kinematics leads us to infer the presence of an inner disc within the main galactic disc, whose presence is marked by two inner Lindblad resonances at 180 pc and 900 pc from the centre respectively. Our map of the H $\alpha$ velocity dispersion shows characteristic values of 20 km s -1 for the HII regions, and an obvious correlation between higher values and the brightest HII regions. The value rises to >100 km s -1 as the nucleus is approached.


Key words: galaxies: individual: NGC 6951 -- galaxies: spiral -- ISM: HII regions

Offprint request: M. Rozas, maite@astrosen.unam.mx

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