138 citations · 1.3k across the 79 of their papers we have counts for
27 papers · 1 filter
The Multiplicity of Main Sequence Turnoffs in Globular Clusters
M. V. Ryabova, Yu. A. Shchekinov
We present color-magnitude diagrams of globular clusters for models with self-enrichment and pre-enrichment. The models with self-enrichment turn out to have two or more main seque…
Low-temperature primordial gas in merging halos
E. O. Vasiliev, Yu. A. Shchekinov
Thermal regime of the baryons behind shock waves arising in the process of virialization of dark matter halos is governed at cetrain conditions by radiation of HD lines. A small fr…
First supernovae in dwarf protogalaxies
E. O. Vasiliev, E. I. Vorobyov, Yu. A. Shchekinov
(Abridged) We explore numerically the chemical, thermal, and dynamical evolution of a shell formed by a high-energy supernova explosion ( erg) in dwarf protogalaxies with…
The influence of ultra-high-energy cosmic rays on star formation in the early universe
E. O. Vasiliev, Yu. A. Shchekinov
The presence of ultra-high-energy cosmic rays (UHECR) results in an increase in the degree of ionization in the post-recombination Universe, which stimulates the efficiency of the…
Primordial gas cooling behind shock waves in merging halos
E. O. Vasiliev, Yu. A. Shchekinov
We investigate thermal regime of the baryons behind shock waves arising in the process of virialization of dark matter halos. We find a fraction of the shocked gas cooled by radiat…
Particle decay in the early universe: predictions for 21 cm
Yu. A. Shchekinov, E. O. Vasiliev
The influence of ultra-high energy cosmic rays (UHECRs) and decaying dark matter particles on the emission and absorption characteristics of neutral hydrogen in 21 cm at redshifts…
Contribution of HD molecules in cooling of the primordial gas
E. O. Vasiliev, Yu. A. Shchekinov
We study the effects of HD molecules on thermochemical evolution of the primordial gas behind shock waves, possibly arised in the process of galaxy formation. We find the critical…
The Minimum Stellar Mass in Early Galaxies
E. O. Vasiliev, Yu. A. Shchekinov
The conditions for the fragmentation of the baryonic component during merging of dark matter halos in the early Universe are studied. We assume that the baryonic component undergoe…
Formation of HD molecules in merging dark matter haloes
Yu. A. Shchekinov, E. O. Vasiliev
HD molecules can be an important cooling agent of the primordial gas behind the shock waves originated through mergings of the dark matter haloes at epochs when first luminous obje…
The generation of low-energy cosmic rays in molecular clouds
Yu. A. Shchekinov
It is argued that if cosmic rays penetrate into molecular clouds, the total energy they lose can exceed the energy from galactic supernovae shocks. It is shown that most likely gal…
Dusty plasmas on galactic scales
Yu. A. Shchekinov
Interstellar dust is spread in galaxies over large scales, often far beyond the stellar disks. Several mechanisms can be responsible for carrying the dust both in the vertical and…
Comparing AGN broad- and narrow-line regions
Nicola Bennert, Heino Falcke, Yuri Shchekinov +1
We compare recent HST observations of Seyfert and quasar NLRs and find that type-2 AGNs follow a relation consistent with that expected for a distribution of gas ionized by a centr…
Primordial star formation triggered by UV photons from UHECR
Yu. A. Shchekinov, E. O. Vasiliev
The presence of ultra-high energy cosmic rays in the universe in the pre-ionization epoch enhances significantly H kinetics in virialized halos. It results in more efficient ra…
Synchrotron emission from circumstellar disks around massive stars
Yu. A. Shchekinov, A. M. Sobolev
We argue that the interaction of stellar wind with the surface of a circumstellar accretion (or protoplanetary) disk can result in the acceleration of relativistic electrons in an…
HI holes in galactic disks: Tracing the dark matter distribution
E. I. Vorobyov, Yu. A. Shchekinov
Multiple SN explosions in disk galaxies efficiently evacuate gas and form cavities with the sizes and shapes of the surrounding envelopes determined by the total amount of injected…
Numerical simulations of expanding supershells in dwarf irregular galaxies. I. Application to Holmberg I
E. I. Vorobyov, U. Klein, Yu. A. Shchekinov +1
Numerical hydrodynamical modelling of supernova-driven shell formation is performed with a purpose to reproduce a giant HI ring (diameter 1.7 kpc) in the dwarf irregular galaxy Hol…
Weakly mass-loaded accretion disks
Yuri A. Shchekinov
Accretion disks with an additional mass input on the disk surface from environment are considered in the limit of low mass input rate, i.e. when the accretion flow remains kepleria…
The Influence of the Gravitational Acceleration on the Supernova-Driven P arker Instability
A. Steinacker, Yu. A. Shchekinov
Within a framework of 2D MHD simulations, we explore the dynamical regimes initi ated by a supernova explosion in a magnetized stratified ISM. We concentrate on the formation of la…
Bubbles in galactic haloes
Yu. A. Shchekinov, R. -J. Dettmar, A. Schroeer +1
We briefly discuss a possible interconnection of vertical HI structures observed in the Milky Way Galaxy with large scale blow-outs caused by the explosions of multiple clustered S…
Mixing Metals in the Early Universe
Andrea Ferrara, Max Pettini, Yuri Shchekinov
We investigate the evolution of the metallicity of the intergalactic medium (IGM) with particular emphasis on its spatial distribution. We propose that metal enrichment occurs as a…
H2 dark matter in the galactic halo from EGRET
P. M. W. Kalberla, Yu. A. Shchekinov, R. -J. Dettmar
We present a model for the interpretation of the gamma-ray background emission from the Galactic halo, which we attribute to interaction of high-energy cosmic rays with dense molec…
Observational consequences of baryonic gaseous dark matter
Yu. A. Shchekinov
Possible observational consequences of dark matter in the Galaxy in the form of dense molecular gas clouds - clumpuscules of masses $M_c\sim 10^{-3} \msun$ and radii $R_c\sim 3\tim…
Wavelength limits on isobaricity of perturbations in a thermally unstable radiatively cooling medium
I. G. Kovalenko, Yu. A. Shchekinov
Nonlinear evolution of one-dimensional planar perturbations in an optically thin radiatively cooling medium in the long-wavelength limit is studied numerically. The accepted coolin…
Photoelectric heating for dust grains at high redshifts
Biman Nath, Shiv Sethi, Yuri Shchekinov
Lyman- absorption systems at with $N_{HI} \ga 3 \times 10^{14}$ cm have been found to be enriched with a mean metallicity of , and…