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11.
A. N. Afanas’ev 《Astronomy Reports》2006,50(9):762-772
The possibility of using the occultation of a pulsar by the solar corona for diagnostics of the magnitude of coronal electron-density inhomogeneities is analyzed. Coronal probing at small elongations is considered, when a ground-based receiver can be in the vicinity of the caustic surface due to the regular refraction of the pulsar radio emission in the circumsolar plasma. 相似文献
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V. L. Afanas’ev S. N. Dodonov A. V. Moiseev A. G. Gorshkov V. K. Konnikova M. G. Mingaliev 《Astronomy Reports》2003,47(6):458-466
Optical identifications and an analysis of the radio spectra of eight radio sources from a flux-density-complete sample at declinations 4°–6° (B 1950) are presented. The observations were carried out at 4000–9000 Å on the 6-m telescope of the Special Astrophysical Observatory and at 0.97–21.7 GHz on the RATAN-600 telescope. Five of the eight sources are quasars and three are emission-line radio galaxies. 相似文献
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The single region of ongoing star formation in the galaxy IC 1613 has been observed in order to reveal the nature of compact emission-line objects at the edges of two shells in the complex, identified earlier in Hα line images. The continuum images show these compact objects to be stars. Detailed spectroscopic observations of these stars and the surrounding nebulae were carried out with an MPFS spectrograph mounted on the 6-m telescope of the Special Astrophysical Observatory. The resulting stellar spectra were used to determine the spectral types and luminosity classes of the objects. Of star we identified the only object of this spectral type in IC 1613. The results of optical observations of the multishell complex are compared to 21-cm radio observations. The shells harboring the stars at their boundaries constitute the most active part of the star-forming region. There is evidence that shocks have played an important role in the formation of the shells. 相似文献
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We list the principal stages of astroclimatic studies concerned with choosing the sites for astrophysical observatories in
Caucasus and Crimea. We chow that the sites for three observatories in Northern Caucasus (Kislovodsk Mountain Astronomical
Station of Pulkovo Main Astronomical Observatory of the Russian Academy of Sciences, Special Astrophysical Observatory of
the Russian Academy of Sciences, Terskol Observatory) were chosen without obtaining representative statistical data in terms
of the number of clear night hours and seeing. We report the data on the number of clear night hours and seeing for the 6-m
telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences based on results of long-term observations.
We discuss the possible causes of the discrepancies between experimental and forecast data and conclude that currently none
of the three observatories in the North Caucasus can be preferred because of the great variety of the methods employed and
limited statistics in terms of astroclimatic and meteorological parameters for some sites. 相似文献
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This is the first paper in a project aimed at analyzing relations between the masses of supermassive black holes or nuclear
clusters in galaxies and the kinematic features of the host galaxies. We present long-slit spectroscopic observations of galaxies
obtained on the 6-m telescope of the Special Astrophysical Observatory using the SCORPIO focal reducer. Radial profiles of
the line-of-sight velocities and velocity dispersions of the stellar populations were obtained for seven galaxies with known
masses of their supermassive black holes (Mkn 79, Mkn 279, NGC 2787, NGC 3245, NGC 3516, NGC 7457, and NGC 7469), and also
for one galaxy with a nuclear cluster (NGC 428). Velocity profiles of the emitting gas were obtained for some of these galaxies
as well. We present preliminary galactic rotation curves derived from these data. 相似文献
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T. A. Lozinskaya A. V. Moiseev V. L. Afanas’ev E. Wilcots W. M. Goss 《Astronomy Reports》2001,45(6):417-427
Observations of the nebula S3 associated with the WO star in the galaxy IC 1613 and of an extended region surrounding S3 are reported. The star and bright core of the nebula were observed with a multipupil fiber spectrograph mounted on the 6-m telescope of the Special Astrophysical Observatory of the Russian Academy of Sciences. Images in the principle spectral lines and integrated spectra of the star and three compact clumps were obtained, and the radial-velocity field constructed. An extended region of the galaxy was observed with the Very Large Array at 21 cm. A giant ring or H I shell enclosing a large fraction of the stellar population in IC 1613 was discovered. The WO star and associated bipolar nebula, which we discovered earlier, lie at the inner edge of the H I ring. A local H I deficiency and two arclike H I ridges were also detected for the first time and probably represent the neutral component of the bipolar shell surrounding the WO star. The two arclike ridges may also have been produced by the collective stellar wind (and supernova explosions?) in OB association No. 9 from the list of Hodge. A scenario for the formation of the extended bipolar feature is discussed, based on the new data. 相似文献
20.
V. L. Afanas’ev S. N. Dodonov A. V. Moiseev A. G. Gorshkov V. K. Konnikova M. G. Mingaliev 《Astronomy Reports》2005,49(5):374-389
We present optical identifications, classifications, and radio spectra for 19 radio sources from a complete sample in flux density with declinations 10°–12°30′ (J2000) obtained with the 6-m optical telescope (4000–9000 Å) and RATAN-600 radio telescope (0.97–21.7 GHz) of the Special Astrophysical Observatory. Twelve objects with redshifts from 0.573 to 2.694 have been classiffied as quasars, and two objects with featureless spectra as BL Lac objects. Four objects are emission-line radio galaxies with redshifts from 0.204 to 0.311 (one also displaying absorption lines), and one object is an absorption-line galaxy with a redshift of 0.214. Radio flux densities have been obtained at six frequencies for all the sources except for two extended objects. The radio spectra of five of the sources can be separated into extended and compact components. Three objects display substantial rapid (on time scales from several days to several weeks) and long-term variability of their flux densities. 相似文献