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There is both theoretical expectation and some observational clues that intermediate mass black holes reside in nuclei of globular clusters. In order to find an independent indicator for their existence, we investigate in this paper how an…

Astrophysics of Galaxies · Physics 2019-01-18 L. Subr , G. Fragione , J. Dabringhausen

In this paper, we study the secular dynamical evolution of binaries composed of intermediate-mass and stellar-mass black holes (IMBHs and SBHs, respectively) in orbit about a central super-massive black hole (SMBH) in galactic nuclei. Such…

Astrophysics of Galaxies · Physics 2018-08-29 Giacomo Fragione , Nathan Leigh

In this paper, we address the question: What is the probability of stellar-mass black hole (BH) binaries co-existing in a globular cluster with an intermediate-mass black hole (IMBH)? Our results suggest that the detection of one or more BH…

Solar and Stellar Astrophysics · Physics 2015-06-22 Nathan W. C. Leigh , Nora Luetzgendorf , Aaron M. Geller , Thomas J. Maccarone , Craig O. Heinke , Alberto Sesana

In this study, we investigate the dynamics of Intermediate-Mass Black Hole (IMBH) binaries within Nuclear Star Clusters (NSCs) that contain a population of stellar-mass black holes (BHs). We examine how these stellar and BH populations…

The dynamical formation of black hole binaries in globular clusters that merge due to gravitational waves occurs more frequently in higher stellar density. Meanwhile, the probability to form intermediate mass black holes (IMBHs) also…

High Energy Astrophysical Phenomena · Physics 2020-09-09 Jongsuk Hong , Abbas Askar , Mirek Giersz , Arkadiusz Hypki , Suk-Jin Yoon

A number of observations hints for the presence of an intermediate mass black hole (IMBH) in the core of three globular clusters: M15 and NGC 6752 in the Milky Way, and G1, in M31. However the existence of these IMBHs is far form being…

Astrophysics · Physics 2009-11-11 M. Colpi , B. Devecchi , M. Mapelli , A. Patruno , A. Possenti

The dynamical evolution of globular clusters (GCs) is tied to their binary population, as binaries segregate to the cluster centre, leading to an increased binary fraction in the core. This central overabundance of mainly hard binaries can…

Recently, an intermediate-mass black hole (IMBH) candidate was announced in the Galactic globular cluster Omega Centauri. IMBHs at the lower end of the traditional mass range have also been detected through gravitational-wave transients,…

High Energy Astrophysical Phenomena · Physics 2026-03-02 Miguel A. S. Martinez , Elena González Prieto , Frederic A. Rasio

Observations suggest that star clusters often form in binaries or larger bound groups. Therefore, mergers between two clusters are likely to occur. If these clusters both harbor an intermediate-mass black hole (IMBH; 10^{2-4} Msun) in their…

Astrophysics · Physics 2009-11-11 Pau Amaro-Seoane , Marc Freitag

We study the short- and long-term effects of an intermediate mass black hole (IMBH) on the orbits of stars bound to the supermassive black hole (SMBH) at the center of the Milky Way. A regularized N-body code including post-Newtonian terms…

Astrophysics of Galaxies · Physics 2011-02-11 Alessia Gualandris , David Merritt

Intermediate-mass black holes (IMBHs) are believed to be the missing link between the supermassive black holes (BHs) found at the centers of massive galaxies and BHs formed through stellar core collapse. One of the proposed mechanisms for…

Astrophysics of Galaxies · Physics 2024-03-14 Rujuta A. Purohit , Giacomo Fragione , Frederic A. Rasio , Grayson C. Petter , Ryan C. Hickox

Evidence has been mounting for the existence of black holes with masses from 10^2 to 10^4 M_Solar associated with stellar clusters. Such intermediate-mass black holes (IMBHs) will encounter other black holes in the dense cores of these…

Astrophysics · Physics 2009-11-07 Kayhan Gultekin , M. Coleman Miller , Douglas P. Hamilton

Repeated mergers of stellar-mass black holes (BHs) in dense star clusters can produce intermediate-mass black holes (IMBHs). In particular, nuclear star clusters at the centers of galaxies have deep enough potential wells to retain most of…

High Energy Astrophysical Phenomena · Physics 2022-07-20 Giacomo Fragione , Abraham Loeb , Bence Kocsis , Frederic A. Rasio

Intermediate Mass Black Hole (IMBH) mergers with masses $10^4 - 10^6$ $M_{\odot}$ are expected to produce gravitational waves (GWs) detectable by the Laser Interferometer Space Antenna (LISA) with high signal to noise ratios out to redshift…

Astrophysics of Galaxies · Physics 2024-08-28 Fazeel Mahmood Khan , Fiza Javed , Kelly Holley-Bockelmann , Lucio Mayer , Peter Berczik , Andrea V. Macciò

Dense stellar environments like nuclear star clusters (NSCs) can dynamically assemble gravitational wave (GW) sources. We consider a population of single stellar mass black holes (BHs) in the inner $0.1$~pc of a NSC surrounding a $4 \times…

Astrophysics of Galaxies · Physics 2026-02-10 Amanda Newton , Sanaea C. Rose , Fulya Kıroğlu , Bao-Minh Hoang , Frederic A. Rasio

Nuclear star clusters (NSCs) are dense stellar clusters observed in galactic nuclei, typically hosting a central massive black hole. Here we study the possible formation and evolution of NSCs through the inspiral of multiple star clusters…

Astrophysics of Galaxies · Physics 2015-06-19 Alessandra Mastrobuono-Battisti , Hagai B. Perets , Abraham Loeb

The study of intermediate-mass black holes (IMBHs) is a young and promising field of research. Formed by runaway collisions of massive stars in young and dense stellar clusters, intermediate-mass black holes could still be present in the…

Despite their potential role as massive seeds for quasars, in dwarf galaxy feedback, and in tidal disruption events, the observational evidence for intermediate-mass black holes (IMBHs) is scarce. LISA may observe stellar-mass black hole…

High Energy Astrophysical Phenomena · Physics 2022-07-13 Vladimir Strokov , Giacomo Fragione , Kaze W. K. Wong , Thomas Helfer , Emanuele Berti

We investigate the formation of intermediate mass black holes (IMBHs) through hierarchical mergers of stellar origin black holes (BHs), as well as BH mergers formed dynamically in nuclear star clusters. Using a semi-analytical approach…

High Energy Astrophysical Phenomena · Physics 2023-10-04 Debatri Chattopadhyay , Jakob Stegmann , Fabio Antonini , Jordan Barber , Isobel M. Romero-Shaw

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
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