Astronomy and Astrophysics – Astrophysics
Scientific paper
2004-10-29
Astron.Astrophys. 420 (2004) 147-161
Astronomy and Astrophysics
Astrophysics
Full resolution images available on NASA ADS
Scientific paper
10.1051/0004-6361:20034263
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 HI data at 21 cm from the VLA or Westerbork. Velocity fields are analyzed and Halpha rotation curves are computed and compared to HI 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 9 pm 2 10^8 Msol compact object. Most of the Halpha rotation curves present a significantly steeper inner slope than their HI 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 at a ratio of 8.5).
Amram Ph.
Blais-Ouellette Sebastien
Carignan Claude
Swaters Rob
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