Victor Afanasiev

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Broad-band optical observations of the extraordinarily bright optical afterglow of the intense gamma-ray burst GRB 991208 started ∼2.1 days after the event and continued until 4 Apr. 2000. The flux decay constant of the optical afterglow in the R-band is −2.30 ± 0.07 up to ∼5 days, which is very likely due to the jet effect, and it is followed by a much(More)
We report a discovery of extended counterrotating gaseous disks in early-type disk galaxies NGC 2551 and NGC 5631. To find them, we have undertaken complex spectral observations including integralfield spectroscopy for the central parts of the galaxies and long-slit deep spectroscopy to probe the external parts. The line-of-sight velocity fields have been(More)
2D spectral observations for 4 Sy galaxies with ionization cones are presented. Images in the [OIII] line, velocity fields of the ionized gas, stellar velocity and dispersion fields were obtained at the SAO RAS 6m telescope. Non-circular gaseous motions and Z-shaped emission filaments may be explained as helical waves which located in the ionization cone.(More)
Spectroscopic and imaging data of the peculiar galaxy Mkn 298 are presented in this paper. Narrow-band H α and broad-band R images are used to study the star formation rate in the galaxy and its morphology, which is typical of a merging system. Long-slit and integral field spectra are used to assess the kinematics of gas and stars, and the nature of the(More)
We present measurements of ages, metallicities, and [α/Fe] ratios for 16 globular clusters (GC) in NGC 147, NGC 185, and NGC 205 and of the central regions of the diffuse galaxy light in NGC 185, and NGC 205. Our results are based on spectra obtained with the SCORPIO multi-slit spectrograph at the 6-m telescope of the Russian Academy of Sciences. We include(More)
We report the results of 3D spectroscopic observations of Mrk 493 (NLS1 galaxy) with the integral-field spectrograph MPFS of the SAO RAS 6-m telescope. The difference in the slope of the optical continuum emission intensity across the nucleus part and an extensive continuum emission region is detected. The emission in lines (Hα, Hβ, [OIII], etc.) coincides(More)
Sternberg Astronomical Institute of the Moscow State University,Universitetsky pr. 13, Moscow, 119992, Russia Special Astrophysical Observatory of the Russian Academy of Sciences, Nizhniy Arkhyz, Karachaevo-Cherkesia, 369167, Russia Université de Lyon 1, Centre de Recherche Astronomique de Lyon, Observatoire de Lyon, 9 avenue Charles André, F-69230(More)