1.2k citations
Counting papers with at most 25 authors, so collaboration author lists do not stand in for the people here.
- National Academy of Sciences of UkraineUA148 papers
- V. N. Karazin Kharkiv National UniversityUA83 papers
- Jilin UniversityCN46 papers
- Centre National de la Recherche ScientifiqueFR27 papers
- Observatoire de ParisFR22 papers
- State Key Laboratory on Integrated OptoelectronicsCN22 papers
- O.Ya. Usikov Institute for Radiophysics and ElectronicsUA20 papers
- Space Research InstituteRU20 papers
- Austrian Academy of SciencesAT18 papers
- Laboratoire d’études spatiales et d’instrumentation en astrophysiqueFR18 papers
- Bar-Ilan UniversityIL15 papers
- Technion – Israel Institute of TechnologyIL14 papers
14 papers · 1 filter
On the Possibility of Detecting a Global Signal in the Line of the Hyperfine Structure of Hydrogen from the Dark Ages
Olexandr Konovalenko, Vyacheslav Zakharenko, Bohdan Novosyadlyj +7
We analyze the possibilities of detecting a signal in the hydrogen 21~cm line, which was formed in the early Universe during the the Dark Ages cosmological epoch, using the Ukraini…
The first molecules in the intergalactic medium and halos of the Dark Ages and Cosmic Dawn
Bohdan Novosyadlyj, Yuriy Kulinich, Bohdan Melekh +1
We study the formation and destruction of the first molecules at the epochs of the Dark Ages and Cosmic Dawn to evaluate the luminosity of the protogalaxy clumps (halos) in the mol…
Redshifted 21-cm emission signal from the halos in Dark Ages
B. Novosyadlyj, V. Shulga, Yu. Kulinich +1
The emission in the hyperfine structure 21 cm line of atomic hydrogen arising in the halos with masses M from the Dark Ages in the models with Warm Dark…
Hydrogen Molecules in the Dark Ages Halos: Thermal Emission vs. Resonant Scattering
B. Novosyadlyj, V. Shulga, Yu. Kulinich +1
The emission from dark ages halos in the lines of transitions between lowest rotational levels of hydrogen and hydrogen deuteride molecules is analyzed. It is assumed molecules to…
Halos in Dark Ages: formation and chemistry
Bohdan Novosyadlyj, Valerii Shulga, Wei Han +2
Formation of halos in the Dark Ages from initial spherical perturbations is analyzed in a four component Universe (dark matter, dark energy, baryonic matter and radiation) in the a…
Molecules in the early Universe
B. Novosyadlyj, O. Sergijenko, V. M. Shulga
We study the formation of first molecules, negative Hydrogen ions and molecular ions in model of the Universe with cosmological constant and cold dark matter. The cosmological reco…
Three Einstein rings: explicit solution and numerical simulation
Elena Yu. Bannikova, Albert T. Kotvytskiy
We investigated the effects of gravitational lensing for a system in which a lens is a point mass and a homogeneous disc with a central hole. In such system there is a variety of c…
The use of gravitational lenses in the study of distant galaxy mergers
A. V. Kats, V. M. Kontorovich
Gravlenses are efficiently explored for detecting the most distant galaxies (up to z=10 redshifts). As an example of the role played by gravlenses we refer to the observation of th…
Merger Driven Explosive Evolution of Distant Galaxies (Minor Mergers)
A. V. Kats, V. M. Kontorovich
We derived solutions for the Smoluchowski kinetic equation for the mass function of galaxies, which describes mergers in differential approximation, where mergers with low-mass gal…
Time delay between images of the lensed quasar UM673
E. Koptelova, W. P. Chen, T. Chiueh +11
We study brightness variations in the double lensed quasar UM673 (Q0142-100) with the aim of measuring the time delay between its two images. In the paper we combine our previously…
N-body simulation of a clumpy torus: application to active galactic nuclei
Elena Yu. Bannikova, Victor G. Vakulik, Alexey V. Sergeev
The gravitational properties of a torus are investigated. It is shown that a torus can be formed from test particles orbiting in the gravitational field of a central mass. In this…
PG 1115+080: variations of the A2/A1 flux ratio and new values of the time delays
V. S. Tsvetkova, V. G. Vakulik, V. M. Shulga +15
We report the results of our multicolor observations of PG 1115+080 with the 1.5-m telescope of the Maidanak Observatory (Uzbekistan, Central Asia) in 2001-2006. Monitoring data in…
Time delays in PG1115+080: new estimates
V. G. Vakulik, V. M. Shulga, R. E. Schild +13
We report new estimates of the time delays in the quadruple gravitationally lensed quasar PG1115+080, obtained from the monitoring data in filter R with the 1.5-m telescope at the…
Neutrinos of non-zero rest mass and the equivalence principle
D. G. Banhatti
Assuming that neutrinos of non-zero rest mass dominate the mass density in the universe, and also the mass density on the scale of clusters of galaxies, one obtains the upper limit…