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Astron. Astrophys. Suppl. Ser. 137, 419-444

Dynamics of blue compact galaxies, as revealed by their H$\alpha$ velocity fields[*]

I. The data, velocity fields and rotation curves[*]

G. Östlin1[*] - P. Amram2 - J. Masegosa3 - N. Bergvall1 - J. Boulesteix2

Send offprint request: G. Östlin, e-mail:

1 - Astronomiska observatoriet, Box 515, S-75120 Uppsala, Sweden
2 - IGRAP, Observatoire de Marseille, 2 place le Verrier, F-13248 Marseille Cedex 04, France
3 - Instituto de Astrofisica de Andalucia, CSIC, Apdo. 3004, E-18080 Granada, Spain

Received July 10; accepted December 4, 1998


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 3.6 m 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-1 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).

Key words: galaxies: compact -- galaxies: starburst -- galaxies: kinematics and dynamics -- galaxies: ISM -- galaxies: interactions

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