Volume 420, Number 1, June II 2004
|Page(s)||147 - 161|
|Published online||14 May 2004|
Accurate determination of the mass distribution in spiral galaxies*
III. Fabry-Perot imaging spectroscopy of 6 spiral galaxies
Department of Astronomy, California Institute of Technology, CA 91125, USA
2 Laboratoire d'Astrophysique de Marseille, Observatoire Astronomique Marseille-Provence, 2 place Le Verrier, 13248 Marseille Cedex 04, France
3 Département de physique and Observatoire du mont Mégantic, Université de Montréal, CP 6128, Succ. centre ville, Montréal, Québec, H3C 3J7 Canada
4 Carnegie Institution of Washington, Washington DC 20015, USA
Corresponding author: P. Amram, firstname.lastname@example.org
Accepted: 1 March 2004
High resolution Fabry-Perot data of six spiral galaxies are presented. Those data extend the previous sample of spiral galaxies studied with high resolution 3D spectroscopy to earlier morphological types. All the galaxies in the sample have available H I data at 21 cm from the VLA or Westerbork. Velocity fields are analyzed and Hα rotation curves are computed and compared to H I curves. The kinematics of NGC 5055 central regions are looked at more closely. Its peculiar kinematics can be interpreted either as a bipolar outflow or as a counter-rotating disk, possibly hosting a compact object. Most of the Hα rotation curves present a significantly steeper inner slope than their H I counterparts. The 21 cm data thus seems affected by moderate to strong beam smearing. The beam smearing has an effect at higher scale-length/beam-width than previously thought (up to 20 km s-1 at a ratio of 8.5).
Key words: Galaxy: fundamental parameters / galaxies: individual: IC 2574, NGC 3109, UGC 2259, NGC 5585, NGC 6503, NGC 2403, NGC 6946, NGC 3198, NGC 5055, NGC 2841, NGC 5985 / galaxies: kinematics and dynamics / cosmology: dark matter / techniques: radial velocities
© ESO, 2004
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