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There have been increasing theoretical speculations and observational indications that certain globular clusters (GCs) could contain a sizeable population of stellar mass black holes (BHs). In this paper, we shortlist at least 29 Galactic…

Astrophysics of Galaxies · Physics 2018-05-16 Abbas Askar , Manuel Arca Sedda , Mirek Giersz

In this paper, we discuss how globular clusters (GCs) structural and observational properties can be used to infer the presence of a black hole system (BHS) inhabiting their inner regions. We propose a novel way to identify the BHS size,…

Astrophysics of Galaxies · Physics 2018-08-01 Manuel Arca Sedda , Abbas Askar , Mirek Giersz

Black holes (BHs) play a major role in the structural and dynamical evolutions of Globular Clusters (GCs). Several recent works searched for BHs in Galactic GCs using scaling relations derived from numerical simulations. However, the…

Astrophysics of Galaxies · Physics 2025-10-20 Alessandro Della Croce

Mergers of stellar-mass black holes were recently observed in the gravitational wave window opened by LIGO. This puts the spotlight on dense stellar systems and their ability to create intermediate-mass black holes (IMBHs) through repeated…

Astrophysics of Galaxies · Physics 2016-06-29 Mario Pasquato

Recent discoveries of black hole (BH) candidates in Galactic and extragalactic globular clusters (GCs) have ignited interest in understanding how BHs dynamically evolve in a GC and the number of BHs ($N_{\rm{BH}}$) that may still be…

Solar and Stellar Astrophysics · Physics 2018-09-05 Newlin C. Weatherford , Sourav Chatterjee , Carl L. Rodriguez , Frederic A. Rasio

Globular clusters have been alternatively predicted to host intermediate-mass black holes (IMBHs) or nearly impossible to form and retain them in their centres. Over the last decade enough theoretical and observational evidence have…

Astrophysics of Galaxies · Physics 2014-11-20 M. Safonova , C. S. Stalin

Recent numerical simulations of globular clusters (GCs) have shown that stellar-mass black holes (BHs) play a fundamental role in driving cluster evolution and shaping their present-day structure. Rapidly mass-segregating to the center of…

Solar and Stellar Astrophysics · Physics 2020-08-12 Newlin C. Weatherford , Sourav Chatterjee , Kyle Kremer , Frederic A. Rasio

Globular clusters have been alternatively predicted to host intermediate-mass black holes (IMBHs) or nearly impossible to form and retain them in their centres. Over the last decade enough theoretical and observational evidence have…

Astrophysics · Physics 2015-06-24 Margarita Safonova , C. S. Stalin

Definitive evidence that globular clusters (GCs) host intermediate-mass black holes (IMBHs) is elusive. Machine learning (ML) models trained on GC simulations can in principle predict IMBH host candidates based on observable features. This…

Astrophysics of Galaxies · Physics 2023-10-31 Mario Pasquato , Piero Trevisan , Abbas Askar , Pablo Lemos , Gaia Carenini , Michela Mapelli , Yashar Hezaveh

Sizeable number of stellar-mass black holes (BHs) in globular clusters (GCs) can strongly influence the dynamical evolution and observational properties of their host cluster. Using results from a large set of numerical simulations, we…

Astrophysics of Galaxies · Physics 2020-03-18 Abbas Askar , Mirek Giersz , Manuel Arca Sedda , Ammar Askar , Mario Pasquato , Agostino Leveque

We discuss the potential of the gravitational microlensing method as a unique tool to detect unambiguous signals caused by intermediate-mass black holes in globular clusters. We select clusters near the line of sight to the Galactic Bulge…

Astrophysics of Galaxies · Physics 2016-06-15 N. Kains , D. M. Bramich , K. C. Sahu , A. Calamida

Numerical simulations have shown that black holes (BHs) can strongly influence the evolution and present-day observational properties of globular clusters (GCs). Using a Monte Carlo code, we construct GC models that match the Milky Way (MW)…

High Energy Astrophysical Phenomena · Physics 2018-03-21 Kyle Kremer , Claire S. Ye , Sourav Chatterjee , Carl L. Rodriguez , Frederic A. Rasio

Populations of stellar-mass black holes (BHs) in globular clusters (GCs) influence their dynamical evolution and have important implications on one of the main formation channels for gravitational wave sources. Inferring the size of these…

Astrophysics of Galaxies · Physics 2024-02-14 Nolan Dickson , Peter J. Smith , Vincent Hénault-Brunet , Mark Gieles , Holger Baumgardt

Context. Globular clusters (GCs) are suggested to host many stellar-mass black holes (BHs) at their centers, thus resulting in ideal testbeds for BH formation and retention theories. BHs are expected to play a major role in GC structural…

Astrophysics of Galaxies · Physics 2024-09-04 A. Della Croce , F. I. Aros , E. Vesperini , E. Dalessandro , B. Lanzoni , F. R. Ferraro , B. Bhat

In this paper we explore the interplay between intermediate-mass black holes (IMBHs) and their nursing globular clusters (GCs), taking advantage of over 2000 Monte Carlo GC models. We find that the average density of IMBHs sphere of…

Astrophysics of Galaxies · Physics 2019-05-06 Manuel Arca Sedda , Abbas Askar , Mirek Giersz

We estimate the rate of gravitational microlensing events of cluster stars due to black holes (BHs) in the globular cluster NGC 5139 ($\omega Cen$). Theory and observations both indicate that $\omega Cen$ may contain thousands of BHs, but…

High Energy Astrophysical Phenomena · Physics 2020-05-12 John Zaris , Doğa Veske , Johan Samsing , Zsuzsa Márka , Imre Bartos , Szabolcs Márka

Supermassive Black Holes (BHs) residing in brightest cluster galaxies (BCGs) are overly massive when considering the local relationships between the BH mass and stellar bulge mass or velocity dispersion. Due to the location of these BHs…

Astrophysics of Galaxies · Physics 2019-05-01 Frederika Phipps , Akos Bogdan , Lorenzo Lovisari , Orsolya E. Kovacs , Marta Volonteri , Yohan Dubois

Globular clusters (GCs) have been at the heart of many longstanding questions in many sub-fields of astronomy and, as such, systematic identification of GCs in external galaxies has immense impacts. In this study, we take advantage of M87's…

Understanding the impact of halo properties beyond halo mass on the clustering of galaxies (namely galaxy assembly bias) remains a challenge for contemporary models of galaxy clustering. We explore the use of machine learning to predict the…

Cosmology and Nongalactic Astrophysics · Physics 2021-09-15 Xiaoju Xu , Saurabh Kumar , Idit Zehavi , Sergio Contreras

In this first of a series of papers, we utilize results for around two thousand star cluster models simulated using the MOCCA code for star cluster evolution (Survey Database I) to determine the astrophysical properties and local merger…

High Energy Astrophysical Phenomena · Physics 2016-10-10 Abbas Askar , Magdalena Szkudlarek , Dorota Gondek-Rosińska , Mirek Giersz , Tomasz Bulik
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