http://dspace.nbuv.gov.ua:80/handle/123456789/114709 2026-04-17T16:31:20Z 2026-04-17T16:31:20Z Zhaborovskyy, V.P. Choliy, V.Ya. http://dspace.nbuv.gov.ua:80/handle/123456789/119816 2017-06-10T00:03:24Z 2014-01-01T00:00:00Z

Earth's pole coordinates determined from Lageos-1/2 laser ranging Zhaborovskyy, V.P.; Choliy, V.Ya. The Earth's pole coordinates, obtained from satellite laser ranging data of Lageos-1 and Lageos-2 are presented. The procedure, used models and algorithms are described. Results are compared with similar series from IERS database.

2014-01-01T00:00:00Z Savchenko, D.O. Iakubovskyi, D.A. http://dspace.nbuv.gov.ua:80/handle/123456789/119815 2017-06-10T00:03:23Z 2014-01-01T00:00:00Z

Creation of 2-5 keV and 5-10 keV sky maps using XMM-Newton data Savchenko, D.O.; Iakubovskyi, D.A. Sky maps are powerful visualisation tools for quicklook analysis of extended sources. The latest sky map in soft X-rays (0.1-2.4 keV) has been created in the 1990's using ROSAT data. By analysing publically available data from XMM-Newton X-ray mission we constructed new sky maps in two energy bands - 2-5 keV and 5-10 keV,complementary to ROSAT data, covering approximately 1% of the sky, and included them in our web-based tool http://skyview.virgoua.org.

2014-01-01T00:00:00Z Kudrya, Yu.N. Tsykaliuk, Iu.Iu. http://dspace.nbuv.gov.ua:80/handle/123456789/119814 2017-06-10T00:03:14Z 2014-01-01T00:00:00Z

Dark matter in the Local Group Kudrya, Yu.N.; Tsykaliuk, Iu.Iu. The observational properties of galaxies aumulated in the Updated Nearby Galaxy Catalog (UNGC) were used by us to derive an orbital mass of the Milky Way and Andromeda galaxy (M 31) via motions of their 31 and 39 ompanions, respe tively. The ratio of the orbital mass of galaxies, whih is a measure of dark matter, to their stellar mass is ∼ 30. If this value is taken as the average value in the Universe, then in the standard osmologial ΛCDM models it will math the value Ωm ≈ 0.09 instead of the generally a epted value Ωm ≈ 0.28. Taking into aount that this last value is realised only in rih lusters, and that the luster at hand ontains only 10% of the total number of galaxies (while the rest are in groups or field galaxies), our results on firm the well-known problem of "lak of dark matter" in the Loal group.

2014-01-01T00:00:00Z Tugay, A.V. http://dspace.nbuv.gov.ua:80/handle/123456789/119810 2017-06-10T00:03:19Z 2014-01-01T00:00:00Z

Extragalactic filament detection with a layer smoothing method Tugay, A.V. Filaments are clearly visible in galaxy distributions, but they are dificult to detect by computer algorithms. Most methods of filament detection can be used only with numerical simulations of a large-scale structure. New simple and effective methods for the real filament detection should be developed. The method of a smoothed galaxy density field was applied in this work to SDSS data of galaxy positions. Five concentric radial layers of 100 Mpc are appropriate for filaments detection. Two methods were tested for the first layer and one more method is proposed.

2014-01-01T00:00:00Z