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There has been recent speculation (Davies & King 2005) that the cores of intermediate-mass stars stripped of their envelopes by tidal interaction with the supermassive black hole in the Galactic centre could form a population…

Astrophysics · Physics 2009-11-11 L. M. Dray , A. R. King , M. B. Davies

The detection of Intermediate-Mass Black Holes (IMBHs) in dwarf galaxies is crucial to closing the gap in the wide mass distribution of black holes ($\sim 3 \, \rm M_{\odot}$ to $\sim 5 \times 10^{10} \, \rm M_{\odot}$). IMBHs originally…

Astrophysics of Galaxies · Physics 2022-02-15 Emma Jane Weller , Fabio Pacucci , Lars Hernquist , Sownak Bose

Despite recent observational efforts, unequivocal signs for the presence of intermediate-mass black holes (IMBHs) in globular clusters (GCs) have not been found yet. Especially when the presence of IMBHs is constrained through dynamical…

Astrophysics of Galaxies · Physics 2018-03-06 Ruggero de Vita , Michele Trenti , Morgan MacLeod

Intermediate Mass Black Holes (IMBHs; 10^1.3-5 M_sun) are thought to form as relics of Population III stars or from the runaway collapse of stars in young clusters; their number and very existence are uncertain. We ran N-body simulations of…

Astrophysics · Physics 2009-11-11 M. Mapelli , A. Ferrara , N. Rea

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

The recent discovery of gravitational waves has opened new horizons for physics. Current and upcoming missions, such as LIGO, VIRGO, KAGRA, and LISA, promise to shed light on black holes of every size from stellar mass (SBH) sizes up to…

Astrophysics of Galaxies · Physics 2018-04-11 Giacomo Fragione , Idan Ginsburg , Bence Kocsis

It is widely accepted that black holes (BHs) with masses greater than a million solar masses (Msun) lurk at the centres of massive galaxies. The origins of such `supermassive' black holes (SMBHs) remain unknown (Djorgovski et al. 1999),…

Astrophysics of Galaxies · Physics 2017-09-06 Tomoharu Oka , Shiho Tsujimoto , Yuhei Iwata , Mariko Nomura , Shunya Takekawa

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

Within the distance of 1 pc from the Galactic center (GC), more than 100 young massive stars have been found. The massive stars at 0.1-1 pc from the GC are located in one or two disks, while those within 0.1 pc from the GC, S-stars, have an…

Astrophysics of Galaxies · Physics 2015-05-18 Michiko Fujii , Masaki Iwasawa , Yoko Funato , Junichiro Makino

A small cluster of massive stars residing in the Galactic center, collectively known as IRS13E, is of special interest due to its close proximity to Sgr A* and the possibility that an embedded intermediate-mass black hole (IMBH) binds its…

High Energy Astrophysical Phenomena · Physics 2020-07-22 Zhenlin Zhu , Zhiyuan Li , Anna Ciurlo , Mark R. Morris , Mengfei Zhang , Tuan Do , Andrea M. Ghez

Black holes (BHs) with masses between 100 to 100,000 times the mass of the Sun ($\rm{M}_{\odot}$) are classified as intermediate-mass black holes (IMBHs), potentially representing a crucial link between stellar-mass and supermassive BHs.…

Astrophysics of Galaxies · Physics 2024-02-29 Abbas Askar , Vivienne F. Baldassare , Mar Mezcua

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

We study the formation of intermediate-mass ratio inspirals (IMRIs) triggered by the interactions between two stellar black holes (BHs) and an intermediate-mass BH (IMBH) inhabiting the centre of a dense star cluster. We exploit $N$-body…

Astrophysics of Galaxies · Physics 2021-08-18 Manuel Arca-Sedda , Pau Amaro-Seoane , Xian Chen

Observations of stellar kinematics, gas dynamics and masers around galactic nuclei have now firmly established that many galaxies host central supermassive black holes (SMBHs) with masses in the range $10^6 \sim 10^9$M$_{\odot}$. However,…

Intermediate-mass black holes (IMBHs) are those between 100 and 10$^5$ solar masses ($M_{\odot}$); their formation process is debated. One possible origin is the growth of less massive black holes (BHs) via mergers with stars and compact…

Astrophysics of Galaxies · Physics 2024-06-12 Michiko S. Fujii , Long Wang , Ataru Tanikawa , Yutaka Hirai , Takayuki R. Saitoh

Intermediate-mass black holes (IMBHs), with masses between roughly $10^2\,M_\odot$ and $10^5\,M_\odot$, represent a largely uncharted component of the black-hole (BH) population. They are theoretically predicted to form in several…

Astrophysics of Galaxies · Physics 2025-12-17 R. Pascale , G. Battaglia

By means of a multimass isotropic and spherical model that includes the self-consistent treatment of a central intermediate-mass black hole (IMBH), the influence of this black hole on the morphological and physical properties of globular…

Astrophysics · Physics 2008-11-26 P. Miocchi

Black holes are usually observed to be of stellar-mass or supermassive. By natural extension, there should be a population of Intermediate-Mass Black Holes (IMBHs: with mass between $100$ to $10^6 M_{\odot}$) in the Universe; which has…

Astrophysics of Galaxies · Physics 2020-06-24 Paramita Barai , Elisabete M. de Gouveia Dal Pino

We investigate the evolution of intermediate-mass (IMBHs), stellar (BHs) and binary black holes (BHBs), deposited near a supermassive black hole (SMBH) by a population of massive star clusters. Stellar BHs rapidly segregate around the SMBH,…

Astrophysics of Galaxies · Physics 2018-11-28 Manuel Arca-Sedda , Roberto Capuzzo-Dolcetta

Intermediate-mass black holes (IMBHs; $M_{BH} <2*10^{5} M_{\odot}$) in galaxy centers are cruciel for painting a coherent picture of the formation and growth of supermassive black holes (SMBHs). Using Big Data analysis, we identified 305…