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Issue A&A Volume 424, Number 2, September III 2004 Page(s) 485 - 495 Section Extragalactic astronomy DOI 10.1051/0004-6361:20040529

A&A 424, 485-495 (2004)
DOI: 10.1051/0004-6361:20040529

Kinematics of the ionised gas in the spiral galaxy NGC 2403

F. Fraternali^{1, 2}, T. Oosterloo² and R. Sancisi<sup>3, 4

1</sup>  Theoretical Physics, University of Oxford, 1 Keble Road, Oxford OX1 3NP, UK
    e-mail: filippo@thphys.ox.ac.uk
²  ASTRON, PO Box 2, 7990 AA, Dwingeloo, The Netherlands
³  INAF, Osservatorio Astronomico, via Ranzani 1, 40127, Bologna, Italy
⁴  Kapteyn Astronomical Institute, University of Groningen, The Netherlands

(Received 26 March 2004 / Accepted 24 May 2004 )

Abstract
We present a study of the kinematics of the ionised gas in the nearby spiral galaxy NGC 2403 using deep long-slit spectra obtained with the 4.2-m William Herschel Telescope. The data show the presence of a halo component of ionised gas that is rotating more slowly than the gas in the disk. The kinematics of this ionised halo gas is similar to that of the neutral halo gas. On small scales, broad line profiles (up to 300 km s ^-1 wide) indicate regions of fast outflows of ionised gas. We discuss these new results in the context of galactic fountain models.

Key words: galaxies: individual: NGC 2403 -- galaxies: structure -- galaxies: kinematics and dynamics -- galaxies: halos -- ISM: kinematics and dynamics

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