We thank the post-graduate student of the Special Astrophysical Observatory A. V. Moiseev for supporting the observations at the 6m telescope. The 6m telescope is operated under the financial support of Science Ministry of Russia (registration number 01-43). During the data analysis we have used the Lyon-Meudon Extragalactic Database (LEDA) supplied by the LEDA team at the CRAL-Observatoire de Lyon (France) and the NASA/IPAC Extragalactic Database (NED) which is operated by the Jet Propulsion Laboratory, California Institute of Technology, under contract with the National Aeronautics and Space Administration. This research has made use of the ING Archive. The WHT and JKT telescopes are operated on the island of La Palma by the Royal Greenwich Observatory in the Spanish Observatorio del Roque de los Muchachos of the Instituto de Astrofisica de Canarias. The research is also partly based on observations made with the NASA/ESA Hubble Space Telescope, obtained from the data archive at the Space Telescope Science Institute, which is operated by the Association of Universities for Research in Astronomy, Inc., under NASA contract NAS 5-26555. The work was supported by grant 98-02-16196 of the Russian Foundation for Basic Researches and by the Russian State Scientific-Technical Program "Astronomy. Basic Space Researches" (the "Astronomy" section).
© European Southern Observatory (ESO) 2000
Online publication: January 29, 2001