Ladislav Šubr
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View article: The star grinder in the Galactic centre. Uncovering the highly compact central stellar-mass black hole cluster
The star grinder in the Galactic centre. Uncovering the highly compact central stellar-mass black hole cluster Open
Various past theoretical considerations and observational efforts suggest the presence of a population of stellar-mass black holes in the innermost parsec of the Galactic centre. In this Letter, we investigate the impact of these black hol…
View article: The star grinder in the Galactic centre
The star grinder in the Galactic centre Open
Context. Various past theoretical considerations and observational efforts suggest the presence of a population of stellar-mass black holes in the innermost parsec of the Galactic centre. Aims. In this Letter, we investigate the impact of …
View article: The masses of open star clusters and their tidal tails and the stellar initial mass function
The masses of open star clusters and their tidal tails and the stellar initial mass function Open
Unresolved binaries have a strong influence on the observed parameters of stellar clusters (SCs). We quantify this influence and compute the resulting mass underestimates and stellar mass function (MF). N-body simulations of realistic SCs …
View article: Failed supernova explosions increase the duration of star formation in globular clusters
Failed supernova explosions increase the duration of star formation in globular clusters Open
Context. The duration of star formation (SF) in globular clusters (GCs) is an essential aspect for understanding their formation. Contrary to previous presumptions that all stars above 8 M explode as core-collapse supernovae (CCSNe), recen…
View article: Failed supernova explosions increase the duration of star formation in globular clusters
Failed supernova explosions increase the duration of star formation in globular clusters Open
Context . The duration of star formation (SF) in globular clusters (GCs) is an essential aspect for understanding their formation. Contrary to previous presumptions that all stars above 8 M ⊙ explode as core-collapse supernovae (CCSNe), re…
View article: The masses of open star clusters and their tidal tails and the stellar initial mass function
The masses of open star clusters and their tidal tails and the stellar initial mass function Open
Context. Unresolved binaries have a strong influence on the observed parameters of stellar clusters (SCs). Aims. We quantify this influence and compute the resulting mass underestimates and stellar mass function (MF). Methods. N -body simu…
View article: Dynamical coupling of Keplerian orbits in a hierarchical four-body system: from the Galactic Centre to compact planetary systems
Dynamical coupling of Keplerian orbits in a hierarchical four-body system: from the Galactic Centre to compact planetary systems Open
This study focuses on the long-term evolution of two bodies in nearby initially coplanar orbits around a central dominant body perturbed by a fourth body on a distant Keplerian orbit. Our previous works that considered this setup enforced …
View article: Dynamical coupling of Keplerian orbits in a hierarchical four-body system: from the Galactic Centre to compact planetary systems
Dynamical coupling of Keplerian orbits in a hierarchical four-body system: from the Galactic Centre to compact planetary systems Open
This study focuses on the long-term evolution of two bodies in nearby initially coplanar orbits around a central dominant body perturbed by a fourth body on a distant Keplerian orbit. Our previous works that considered this setup enforced …
View article: Asymmetrical tidal tails of open star clusters: stars crossing their cluster’s práh† challenge Newtonian gravitation
Asymmetrical tidal tails of open star clusters: stars crossing their cluster’s práh† challenge Newtonian gravitation Open
After their birth a significant fraction of all stars pass through the tidal threshold (práh) of their cluster of origin into the classical tidal tails. The asymmetry between the number of stars in the leading and trailing tails tests grav…
View article: The giants that were born swiftly -- Implications of the top-heavy stellar initial mass function on the birth conditions of globular clusters
The giants that were born swiftly -- Implications of the top-heavy stellar initial mass function on the birth conditions of globular clusters Open
Recent results suggest that the initial mass function (IMF) of globular clusters (GCs) is metallicity and density dependent. Here it is studied how this variation affects the initial masses and the numbers of core collapse supernovae (CCSN…
View article: The giants that were born swiftly – implications of the top-heavy stellar initial mass function on the birth conditions of globular clusters
The giants that were born swiftly – implications of the top-heavy stellar initial mass function on the birth conditions of globular clusters Open
Recent results suggest that the initial mass function (IMF) of globular clusters (GCs) is metallicity and density dependent. Here, it is studied how this variation affects the initial masses and the numbers of core-collapse supernovae (CCS…
View article: Estimating the Ages of Open Star Clusters from Properties of Their Extended Tidal Tails
Estimating the Ages of Open Star Clusters from Properties of Their Extended Tidal Tails Open
The most accurate current methods for determining the ages of open star clusters, stellar associations, and stellar streams are based on isochrone fitting or the lithium depletion boundary. We propose another method for dating these object…
View article: Estimating the ages of open star clusters from properties of their extended tidal tails
Estimating the ages of open star clusters from properties of their extended tidal tails Open
The most accurate current methods for determining the ages of open star clusters, stellar associations and stellar streams are based on isochrone fitting or the lithium depletion boundary. We propose another method for dating these objects…
View article: Enhanced Kozai–Lidov Eccentricity Oscillations in Nuclear Star Clusters
Enhanced Kozai–Lidov Eccentricity Oscillations in Nuclear Star Clusters Open
Stellar motions in the innermost parts of galactic nuclei, where the gravity of a supermassive black hole dominates, follow Keplerian ellipses to the first order of approximation. These orbits may be subject to periodic (Kozai–Lidov) oscil…
View article: How many explosions does one need? Quantifying supernovae in globular clusters from iron abundance spreads
How many explosions does one need? Quantifying supernovae in globular clusters from iron abundance spreads Open
Many globular clusters (GCs) are known to host multiple populations distinguishable by their light-element content. Less common are GCs displaying iron abundance spreads that are seen as evidence for enrichment through core collapse supern…
View article: Very high redshift quasars and the rapid emergence of super-massive black holes
Very high redshift quasars and the rapid emergence of super-massive black holes Open
The observation of quasars at very high redshift such as Pōniuā’ena is a challenge for models of super-massive black hole (SMBH) formation. This work presents a study of SMBH formation via known physical processes in star-burst clusters fo…
View article: Do star clusters form in a completely mass-segregated way?
Do star clusters form in a completely mass-segregated way? Open
Context . ALMA observations of the Serpens South star-forming region suggest that stellar protoclusters may be completely mass segregated at birth. Independent observations also suggest that embedded clusters form segregated by mass. Aims …
View article: Intermediate-mass black holes in binary-rich star clusters
Intermediate-mass black holes in binary-rich star clusters Open
There is both theoretical expectation and some observational clues that\nintermediate mass black holes reside in nuclei of globular clusters. In order\nto find an independent indicator for their existence, we investigate in this\npaper how…