Limits on Cosmological Parameters from Statistical Investigations of the Ratan-600 and 87GB Surveys

The sky distributions of sources in a RATAN-600 survey and a strip of the 87GB survey have been investigated. The presence of deviations from a Poisson radio source distribution is confirmed. A significant fraction of radio sources are associated with the supercluster-void network, which is composed of regular periodic structures on scales from 30 arcmin to one degree. A comparative study of the distributions and identifications of the RATAN-600 and 87GB surveys is performed. The data from this study are used to set limits on the cosmological parameter qo and the epoch of formation of large scale structures in the Universe.     

Optical and IR monitoring of the BL Lac object S5 0716+714 from 2001–2004

Multicolor (BV RIJHK) observations of the BL Lac object S5 0716+714 carried out irom 2001–2004 indicate that the spectral energy distribution of the slowly varying component remained constant over the entire wavelength interval and over the three-year observation period. The distribution can be represented by the power law F _v ∼ v ^−1.12, providing evidence that this component has a synchrotron nature. The color characteristics of very rapid variability detected on several nights are the same as those for the slowly varying component. An analysis of published data on the color variability of the object for previous years indicates that the color characteristics of the slowly varying component are stable, independent of the time intervals considered and the characteristic variability time scales.     

Studies of sources from the WMAP catalog

Observations of a complete sample of sources from the WMAP catalog were obtained at 22.2 and 36.8 GHz on the RT-22 radio telescope of the Crimean Astrophysical Observatory. We have determined the distribution of the source spectral indices between these frequencies. The distributions of the spectral indices of the WMAP catalog (between 23 and 33 GHz) and in the RT-22 sample have the same shape and half-width, suggesting that the mean source parameters are constant in time. We have plotted the log N — log S dependence down to the flux levels of about 0.1 Jy using pilot data from the AT20 survey, where a cosmological “cutoff” in the source counts is already observed. The variability of individual sources in connection with flare activity is considered. The optical characteristics of the complete sample of WMAP sources are compared to those of identified AT20 survey sources.     

New data on the age of ultrametamorphic granitoids of the Aldan granulite area (Eastern Siberia), consequences of metamorphic processes and possibilities of regional correlations of geological events

This work presents new U-Pb data (SHRIMP-II) for zircons from products of granitization and leucosomes of migmatites from amphibolite- and granulite-facies zones developed on rocks of the tonalite-trondhjemite group of the unstratified basement and supracrustal formations of the western part of the Aldan granulite area. The age data obtained were interpreted using the data available on the U and Th geochemistry. The main geochemical trend of transition from primary zircons, crystallizing from the melt to the later metamorphic zircons is manifested in increasing U and Th concentrations in zircons. In this case, the Th/U ratio decreases, as do the values of the Ce anomaly and LuN/LaN ratio. By studying the sequence of autochthonous and paraautochthonous granite formation in the amphibolite-facies zone the ancient (3222–3226 Ma) metamorphic event in the Aldan Shield (a manifestation of the ultrametamorphic processes (granitization and migmatization), superimposed on rocks of an ancient infracomplex (3.3–3.4 Ga) and gneisses and schists of supracrustal formations) was established. The data obtained indicate the Middle Archean age of both metamorphosed rock complexes. The ancient period of evolutionary development of the Aldan shield was followed by development of diatectic granitoids with an age of 2450 Ma, which is correlated well with Proterozoic granitoids from the conjunction zone between the Aldan granulite area and Olekma granite-greenstone terrain.