The survey in 21-cm line of HI for "close" (V < 6000 km/s) subsample of BCGs from SBS and FBS is completed. Altogether about 150 galaxies were observed with Nan\c {c} 300-m and Green-Bank 43-m radio telescopes. About 2/3 of them were detected. Processing of the data is close to completion.

The analysis of this HI data, together with the results of CCD-imaging and photometry of these galaxies allows to estimate total (dynamical) mass of them. The important result of this work is a conclusion that the mass ratio of luminous and dark matter in dwarf galaxies can vary in very wide range - from 0.1 till more than 0.7-0.8. The latter objects are the most gas-rich galaxies. This is not consistent with the known correlation obtained on rotation curves for spyral galaxies. For spirals this ratio on the least massive end (Sm-galaxies) is close to 0.1-0.2. The applications of these new results for galaxy formation models and study the nature of Dark Matter are now under elaboration.

Copy of this figure as a PostScript file

1. Pustilnik S.A.
2. Lipovetsky V.A.

• T.X.Thuan - Virginia Univ. (USA)
• J.-M.Martin - Observatoire de Paris-Meudon (France)

January 4, 1999