Particle acceleration in winds of star clusters [PDF]
Monthly notices of the Royal Astronomical Society, 2021 The origin of cosmic rays in our Galaxy remains a subject of active debate. While supernova remnant (SNR) shocks are often invoked as the sites of acceleration, it is now widely accepted that the difficulties of such sources in reaching PeV energies ...
G. Morlino +3 more
semanticscholar +1 more source
Modeling Dense Star Clusters in the Milky Way and beyond with the Cluster Monte Carlo Code [PDF]
Astrophysical Journal Supplement Series, 2021 We describe the public release of the Cluster Monte Carlo (CMC) code, a parallel, star-by-star N-body code for modeling dense star clusters. CMC treats collisional stellar dynamics using Hénon’s method, where the cumulative effect of many two-body ...
C. Rodriguez +11 more
semanticscholar +1 more source
Hierarchical black hole mergers in young, globular and nuclear star clusters: the effect of metallicity, spin and cluster properties [PDF]
, 2021 We explore hierarchical black hole (BH) mergers in nuclear star clusters (NSCs), globular clusters (GCs) and young star clusters (YSCs), accounting for both original and dynamically assembled binary BHs (BBHs).
M. Mapelli +10 more
semanticscholar +1 more source
Intermediate-mass black holes from stellar mergers in young star clusters [PDF]
Monthly notices of the Royal Astronomical Society, 2021 Intermediate-mass black holes (IMBHs) in the mass range $10^2\!-\!10^5\, \mathrm{M_{\odot }}$ bridge the gap between stellar black holes (BHs) and supermassive BHs. Here, we investigate the possibility that IMBHs form in young star clusters via runaway
Ugo N Di Carlo +10 more
semanticscholar +1 more source
Populating the Upper Black Hole Mass Gap through Stellar Collisions in Young Star Clusters [PDF]
Astrophysical Journal, 2020 Theoretical modeling of massive stars predicts a gap in the black hole (BH) mass function above ∼40–50 M ⊙ for BHs formed through single star evolution, arising from (pulsational) pair-instability supernovae (PISNe).
K. Kremer +8 more
semanticscholar +1 more source
On the Origin of GW190521-like Events from Repeated Black Hole Mergers in Star Clusters [PDF]
Astrophysical Journal, 2020 LIGO and Virgo have reported the detection of GW190521, from the merger of a binary black hole (BBH) with a total mass around 150 M⊙. While current stellar models limit the mass of any black hole (BH) remnant to about 40–50 M⊙, more massive BHs can be ...
G. Fragione, A. Loeb, F. Rasio
semanticscholar +1 more source
Intermediate-mass Black Holes from High Massive-star Binary Fractions in Young Star Clusters [PDF]
Astrophysical Journal, 2020 Black holes formed in dense star clusters, where dynamical interactions are frequent, may have fundamentally different properties than those formed through isolated stellar evolution.
E. Gonz'alez +7 more
semanticscholar +1 more source
Dust-buried Compact Sources in the Dwarf Galaxy NGC 4449
The Astrophysical Journal, 2023 Multiwavelength images from the Hubble Space Telescope covering the wavelength range 0.27–1.6 μ m show that the central area of the nearby dwarf galaxy NGC 4449 contains several tens of compact sources that are emitting in the hydrogen recombination line
Daniela Calzetti +12 more
doaj +1 more source
Unveiling Hidden Stellar Aggregates in the Milky Way: 1656 New Star Clusters Found in Gaia EDR3
The Astrophysical Journal Supplement Series, 2022 We report 1656 new star clusters found in the Galactic disk (∣ b ∣ < 20°) beyond 1.2 kpc, using Gaia EDR3 data. Based on an unsupervised machine-learning algorithm, DBSCAN, and following our previous studies, we utilized a unique method to do the data ...
Zhihong He +4 more
doaj +1 more source
Binary black holes in young star clusters: the impact of metallicity [PDF]
, 2020 Young star clusters are the most common birth-place of massive stars and are dynamically active environments. Here, we study the formation of black holes (BHs) and binary black holes (BBHs) in young star clusters, by means of 6000 N-body simulations ...
Ugo N Di Carlo +11 more
semanticscholar +1 more source