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Issue A&A Volume 405, Number 1, July I 2003 Page(s) 89 - 97 Section Galactic structure and dynamics DOI 10.1051/0004-6361:20030590

A&A 405, 89-97 (2003)
DOI: 10.1051/0004-6361:20030590

An H study of the kinematics of NGC 3627

L. Chemin¹, V. Cayatte¹, C. Balkowski¹, M. Marcelin², P. Amram², W. van Driel¹ and H. Flores<sup>1

1</sup>  Observatoire de Paris, GEPI, UMR 8111, associé au CNRS et à l'Université Paris VII, 5 place J. Janssen, 92195 Meudon, France
²  Observatoire Astronomique Marseille-Provence, 2 place Le Verrier, 13248 Marseille, France

(Received 24 September 2002 / Accepted 15 April 2003)

Abstract
We report here on the first observations in the H   line to investigate the kinematics of the spiral galaxy NGC 3627, the brightest member of the Leo Triplet. The velocity field observed at high angular resolution shows signatures of non-circular motion. They can be attributed to dynamical perturbations due to the bar and to external interactions. In particular, we confirm the presence of an inner ring recently detected in CO observations (Regan et al. 2002). We find a corotation radius significantly smaller than that derived in previous studies and we show that the inner ring location is consistent with the ultra-harmonic resonance induced by the bar pattern speed. We also show that a warped tilted-ring model can be fitted to the outer parts of the southern, receding half of the disc, which is inclined by some 15° relative to the inner parts of the galaxy.

Key words: galaxies: individual: NGC 3627 -- galaxies: kinematics and dynamics -- galaxies: structure

Offprint request: L. Chemin, Laurent.Chemin@obspm.fr

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