M. Ishchenko
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View article: Dynamical evolution timescales for the supermassive black hole system in the galaxy NGC 7727 (Arp 222)
Dynamical evolution timescales for the supermassive black hole system in the galaxy NGC 7727 (Arp 222) Open
Context. A dual active galactic nucleus candidate with a separation of only ≈500 pc was recently found in NGC 7727. According to the hierarchical merging scenario, such objects would be expected to merge on a timescale of a few hundred mil…
View article: Gravitational influence of the globular cluster NGC 7078 (M 15) flyby of the Oort cloud system
Gravitational influence of the globular cluster NGC 7078 (M 15) flyby of the Oort cloud system Open
Context . It is crucial to understand the interaction between globular clusters (GCs) and the Oort cloud, as close flybys of such massive objects can significantly disturb the cloud’s structure and redirect comets towards the inner Solar S…
View article: Evolution of the disky second generation of stars in globular clusters on cosmological timescales
Evolution of the disky second generation of stars in globular clusters on cosmological timescales Open
Context . Many Milky Way globular clusters (GCs) host multiple stellar populations, challenging the traditional view that GCs are single-population systems. It has been suggested that second-generation stars could form in a disk from gas l…
View article: Dynamical evolution of the open clusters with different star formation efficiencies and orbital parameters
Dynamical evolution of the open clusters with different star formation efficiencies and orbital parameters Open
Context . Open star clusters are dynamic systems whose evolution is critically influenced by initial conditions such as star formation efficiency and orbital parameters. Understanding their dissolution mechanisms provides insight into stel…
View article: Dynamical evolution of the open clusters with different star formation efficiencies and orbital parameters
Dynamical evolution of the open clusters with different star formation efficiencies and orbital parameters Open
Open star clusters are dynamic systems whose evolution is critically influenced by initial conditions such as star formation efficiency and orbital parameters. Understanding their dissolution mechanisms provides insight into stellar popula…
View article: Cosmological insights into the early accretion of r-process-enhanced stars II. Dynamical identification of lost members of Reticulum II
Cosmological insights into the early accretion of r-process-enhanced stars II. Dynamical identification of lost members of Reticulum II Open
Aims. We identify the possible dynamical connection between individual r-process-enhanced stars and the ultra-faint dwarf galaxy Reticulum II based on the current phase-space information for these stars and the dynamical mass-loss model of…
View article: Cosmological insights into the early accretion of r-process-enhanced stars
Cosmological insights into the early accretion of r-process-enhanced stars Open
Aims. We identify the possible dynamical connection between individual r -process-enhanced stars and the ultra-faint dwarf galaxy Reticulum II based on the current phase-space information for these stars and the dynamical mass-loss model o…
View article: Evolution of the disky second generation of stars in globular clusters on cosmological timescale
Evolution of the disky second generation of stars in globular clusters on cosmological timescale Open
Context. Many Milky Way globular clusters (GCs) host multiple stellar populations, challenging the traditional view of GCs as single-population systems. It has been suggested that second-generation stars could form in a disk from gas lost …
View article: THE INFLUENCE OF OBSERVATIONAL ERRORS IN GAIA DR3 ON THE RECONSTRUCTION OF GLOBULAR CLUSTER ORBITS ON A COSMOLOGICAL TIMESCALE
THE INFLUENCE OF OBSERVATIONAL ERRORS IN GAIA DR3 ON THE RECONSTRUCTION OF GLOBULAR CLUSTER ORBITS ON A COSMOLOGICAL TIMESCALE Open
In recent years, the emerging field of astronomy focused on the history of galaxy formation, known as Galactic Archaeology, has been gaining popularity. Globular clusters have been involved in many key processes occurring in the Milky Way,…
View article: Dynamical evolution of Milky Way globular clusters on the cosmological timescale
Dynamical evolution of Milky Way globular clusters on the cosmological timescale Open
Context. Based on the Gaia DR3, we reconstructed the orbital evolution of the known Milky Way globular clusters and found that six objects, NGC 6681, NGC 6981, Palomar 6, NGC 6642, HP 1, and NGC 1904, very likely interact closely with the …
View article: Dynamical evolution timescales for the triple supermassive black hole system in NGC 6240
Dynamical evolution timescales for the triple supermassive black hole system in NGC 6240 Open
Aims. Based on the available observational data from the literature, we analysed the dynamics of the NGC 6240 galaxy central supermassive black hole (SMBH) system. Methods. For the dynamical modelling of this triple SBMH system, we used th…
View article: Star-by-star dynamical evolution of the physical pair of the Collinder 135 and UBC 7 open clusters
Star-by-star dynamical evolution of the physical pair of the Collinder 135 and UBC 7 open clusters Open
Context. In a previous paper using Gaia DR2 data, we demonstrated that the two closely situated open clusters Collinder 135 and UBC 7 might have formed together about 50 Myr ago. Aims. In this work, we performed star-by-star dynamical mode…
View article: Milky Way globular clusters on cosmological timescales
Milky Way globular clusters on cosmological timescales Open
Context. The present epoch of the Gaia success gives us a possibility to predict the dynamical evolution of our Solar System in the global Galactic framework with high precision. Aims. We statistically investigated the total interaction of…
View article: Milky Way globular clusters on cosmological timescales. IV. Guests in the outer Solar System
Milky Way globular clusters on cosmological timescales. IV. Guests in the outer Solar System Open
The present epoch of the Gaia success gives us a possibility to predict the dynamical evolution of our Solar System in the global Galactic framework with high precision. We statistically investigated the total interaction of globular clust…
View article: ESTIMATING GAMMA-RAY FLUX FROM MILLISECOND PULSARS ORIGINATING IN GLOBULAR CLUSTERS NEAR THE GALACTIC CENTER
ESTIMATING GAMMA-RAY FLUX FROM MILLISECOND PULSARS ORIGINATING IN GLOBULAR CLUSTERS NEAR THE GALACTIC CENTER Open
In this study, we investigate the contribution of millisecond pulsars (MSPs) to the gamma-ray excess observed in the Galactic Center by analyzing data from high-resolution direct N-body simulations of six globular clusters (GCs) that exper…
View article: Milky Way globular clusters on cosmological timescales
Milky Way globular clusters on cosmological timescales Open
Aims. We carry out the self-consistent dynamic evolution of the orbital structure of Milky Way globular clusters. This allows us to estimate possible and probable close passages and even collisions of the clusters with each other. Methods.…
View article: Milky Way globular clusters on cosmological timescales. III. Interaction rates
Milky Way globular clusters on cosmological timescales. III. Interaction rates Open
Aims. We carry out the self-consistent dynamic evolution of the orbital structure of Milky Way globular clusters. This allows us to estimate possible and probable close passages and even collisions of the clusters with each other. Methods.…
View article: Milky Way globular clusters on cosmological timescales
Milky Way globular clusters on cosmological timescales Open
Context. Recent observational data show that the Milky Way galaxy contains about 170 globular clusters. A fraction of them is likely formed in dwarf galaxies that were accreted onto the Milky Way in the past, while the remaining clusters w…
View article: Milky Way globular clusters on cosmological timescales
Milky Way globular clusters on cosmological timescales Open
Aims. We estimate the dynamical evolution of the interaction of globular clusters’ with the Galactic centre that dynamically changed in the past. Methods. We simulated the orbits of 147 globular clusters over a 10 Gyr lookback time using t…
View article: Milky Way globular clusters on cosmological timescales. II. Interaction with the Galactic centre
Milky Way globular clusters on cosmological timescales. II. Interaction with the Galactic centre Open
Aims. We estimate the dynamical evolution of the Globular Clusters interaction with the Galactic centre that dynamically changed in the past. Methods. We simulated the orbits of 147 globular clusters over 10 Gyr lookback time using the par…
View article: Statistical Analysis of the Probability of Interaction of Globular Clusters with Each Other and with the Galactic Center on the Cosmological Time Scale According to Gaia DR2 Data
Statistical Analysis of the Probability of Interaction of Globular Clusters with Each Other and with the Galactic Center on the Cosmological Time Scale According to Gaia DR2 Data Open
This study is aimed at investigating the dynamic evolution of the orbits of stellar globular clusters (GCs). To integrate the orbits backward in time, the authors use models of the time-varying potentials derived from cosmological simulati…
View article: Merging of unequal mass binary black holes in non-axisymmetric galactic nuclei
Merging of unequal mass binary black holes in non-axisymmetric galactic nuclei Open
In this work, we study the stellar-dynamical hardening of unequal mass supermassive black hole (SMBH) binaries in the central regions of merging galactic nuclei. We present a comprehensive set of direct N -body simulations of the problem, …
View article: Dynamical evolution modeling of the Collinder 135 & UBC 7 binary star cluster
Dynamical evolution modeling of the Collinder 135 & UBC 7 binary star cluster Open
The purpose of the present work is a detailed investigation of the dynamical evolutionof Collinder 135 and UBC 7 star clusters. We present a set of dynamical numerical simulationsusing realistic star clusterN-body modeling technique with t…
View article: Kinematic characteristics of the Milky Way globular clusters based on Gaia DR2 data
Kinematic characteristics of the Milky Way globular clusters based on Gaia DR2 data Open
Using the data from Gaia (ESA) Data Release 2 we performed the orbital calculations of globular clusters (GCs) of the Milky Way. To explore possible close encounters (or collisions) between the GCs, using our own developed high-order φ-GRA…
View article: Kinematic characteristics of the Milky Way globular clusters based on Gaia DR2 data
Kinematic characteristics of the Milky Way globular clusters based on Gaia DR2 data Open
Using the data from Gaia (ESA) Data Release 2 we performed the orbital calculations of globular clusters (GCs) of the Milky Way. To explore possible close encounters (or collisions) between the GCs, using our own developed high-order φ-GRA…
View article: MILKY WAY GLOBULAR CLUSTERS: CLOSE ENCOUNTER RATES WITH EACH OTHER AND WITH THE CENTRAL SUPERMASSIVE BLACK HOLE
MILKY WAY GLOBULAR CLUSTERS: CLOSE ENCOUNTER RATES WITH EACH OTHER AND WITH THE CENTRAL SUPERMASSIVE BLACK HOLE Open
Using the data from Gaia (ESA) Data Release 2 we performed the orbital\ncalculations of globular clusters (GCs) of the Milky Way. To explore possible\ncollisions between the GCs, using our developed highorder {\\phi}-GRAPE code, we\nintegr…
View article: Dynamical model of an obscuring clumpy torus in AGNs – I. Velocity and velocity dispersion maps for interpretation of ALMA observations
Dynamical model of an obscuring clumpy torus in AGNs – I. Velocity and velocity dispersion maps for interpretation of ALMA observations Open
We have developed the dynamical model of a clumpy torus in an active galactic nucleus (AGN) and compared to recent The Atacama Large Millimeter Array (ALMA) observations. We present N-body simulations of a torus in the field of a supermass…