J. Haas
YOU?
Author Swipe
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: 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: 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: The Making of a USA Map Pinhole Projector
The Making of a USA Map Pinhole Projector Open
Encouraging learners of all ages to experience solar eclipses safely is one of NASA's main priorities and goals during these beautiful and awe-inspiring celestial events. Besides ISO certified solar viewing glasses and other direct viewing…
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: 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: Economic, cognitive, academic, and attendance characteristics of elementary students receiving special education services : a program evaluation in one district
Economic, cognitive, academic, and attendance characteristics of elementary students receiving special education services : a program evaluation in one district Open
Public education, at present, is focused on ensuring the success of all students and has tasked educators with producing positive results. Despite this political climate, research has indicated that some learners, such as those considered …