Astronomy and Astrophysics – Astrophysics
Scientific paper
1998-12-15
Astronomy and Astrophysics
Astrophysics
26 pages, 14 figures. Accepted for publication in A&AS. The paper (with figures in slightly higher resolution) and an electron
Scientific paper
10.1051/aas:1999488
Observations of six luminous blue compact galaxies (BCGs) and two star forming companion galaxies were carried out with the CIGALE scanning Fabry-Perot interferometer attached to the ESO 3.6m telescope on La Silla. The observations were made in the H-alpha emission line which is prominent in BCGs. A velocity sampling of 5 km/s and a pixel size of 0.9 arcseconds were used. In this paper we present the observations and the data together with the velocity fields and the derived rotation curves. In addition we provide rough estimates of the total dynamical mass and of the ionised gas mass for each galaxy. All galaxies display rotation, but while the companion galaxies have regular velocity fields, those of the BCGs are complex and appear perturbed. This is the most extensive study to date of the optical velocity fields of BCGs. The interpretation of these results will be presented in a forthcoming paper (Paper II).
Amram Ph.
Bergvall Nils
Boulesteix Jacques
Masegosa Josefa
Ostlin Goeran
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