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Intermediate mass black holes (IMBHs) are an (as yet) elusive class of black holes that are expected to lie in the $10^2-10^5\,M_{\odot}$ range, between the firmly established stellar-mass black holes and ${\gtrsim}10^6\,M_{\odot}$…

Astrophysics of Galaxies · Physics 2018-05-16 Filippos Koliopanos

This white paper explores the detectability of intermediate-mass black holes (IMBHs) wandering in the Milky Way (MW) and massive local galaxies, with a particular emphasis on the role of AXIS. IMBHs, ranging within $10^{3-6} \, M_\odot$,…

Astrophysics of Galaxies · Physics 2023-11-16 Fabio Pacucci , Bryan Seepaul , Yueying Ni , Nico Cappelluti , Adi Foord

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

If intermediate mass black holes (IMBHs) grow efficiently in gas disks around supermassive black holes, their host active galactic nucleus (AGN) disks should exhibit myriad observational signatures. Gap-opening IMBHs in AGN disks can…

Astrophysics of Galaxies · Physics 2015-06-19 B. McKernan , K. E. S. Ford , B. Kocsis , W. Lyra , L. M. Winter

Stellar-mass and supermassive black holes abound in the Universe, whereas intermediate-mass black holes (IMBHs) of ~10^2-10^5 solar masses in between are largely missing observationally, with few cases found only. Here we report the…

High Energy Astrophysical Phenomena · Physics 2025-01-17 C. -C. Jin , D. -Y. Li , N. Jiang , L. -X. Dai , H. -Q. Cheng , J. -Z. Zhu , C. -W. Yang , A. Rau , P. Baldini , T. -G. Wang , H. -Y. Zhou , W. Yuan , C. Zhang , X. -W. Shu , R. -F. Shen , Y. -L. Wang , S. -X. Wen , Q. -Y. Wu , Y. -B. Wang , L. L. Thomsen , Z. -J. Zhang , W. -J. Zhang , A. Coleiro , R. Eyles-Ferris , X. Fang , L. C. Ho , J. -W. Hu , J. -J. Jin , W. -X. Li , B. -F. Liu , F. -K. Liu , M. -J. Liu , Z. Liu , Y. -J. Lu , A. Merloni , E. -L. Qiao , R. Saxton , R. Soria , S. Wang , Y. -Q. Xue , H. -N. Yang , B. Zhang , W. -D. Zhang , Z. -M. Cai , F. -S. Chen , H. -L. Chen , T. -X. Chen , W. Chen , Y. -H. Chen , Y. -F. Chen , Y. Chen , B. Cordier , C. -Z. Cui , W. -W. Cui , Y. -F. Dai , H. -C. Ding , D. -W. Fan , Z. Fan , H. Feng , J. A. Garcia , J. Guan , D. -W. Han , D. -J. Hou , H. -B. Hu , M. -H. Huang , J. Huo , S. -M. Jia , Z. -Q. Jia , B. -W. Jiang , G. Jin , X. Kong , E. Kuulkers , W. -H. Lei , C. -K. Li , J. -F. Li , L. -H. Li , M. -S. Li , W. Li , Z. -D. Li , T. -Y. Lian , Z. -X. Ling , C. -Z. Liu , H. -Y Liu , H. -Q. Liu , J. -F. Liu , Y. Liu , F. -J. Lu , L. -D. Luo , J. Ma , X. Mao , H. -Y. Mu , K. Nandra , P. O'Brien , H. -W. Pan , X. Pan , G. -J. Qin , N. Rea , J. Sanders , L. -M. Song , H. Sun , S. -L. Sun , X. -J. Sun , Y. -Y. Tan , Q. -J. Tang , Y. -H. Tao , B. -C. Wang , J. Wang , J. -F. Wang , L. Wang , W. -X. Wang , Y. -S. Wang , Z. -X. Wang , Q. -W. Wu , X. -F. Wu , H. -T. Xu , J. -J. Xu , X. -P. Xu , Y. -F. Xu , Z. Xu , C. -B. Xue , S. -J. Xue , Y. -L. Xue , A. -L. Yan , X. -T. Yang , Y. -J. Yang , J. Zhang , M. Zhang , S. -N. Zhang , Y. -H. Zhang , Z. Zhang , Z. Zhang , Z. -L. Zhang , D. -H. Zhao , H. -S. Zhao , X. -F. Zhao , Z. -J. Zhao , J. Zheng , Q. -F. Zhu , Y. -X. Zhu , Z. -C. Zhu , H. Zou

Even though the existence of intermediate-mass black holes (IMBHs, black holes with masses ranging between $10^{2-4}\,M_{\odot}$) has not yet been corroborated observationally, these objects are of high interest for astrophysics. Our…

Cosmology and Nongalactic Astrophysics · Physics 2014-11-20 Pau Amaro-Seoane , Lucia Santamaria

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

A galaxy-sized halo may contain a large number of intermediate mass (10^{2-4} solar mass) compact objects (IMCOs), which can be intermediate mass black holes (IMBHs) or the CDM subhalos. We propose to directly detect the IMBHs by observing…

Astrophysics · Physics 2015-06-24 Kaiki Taro Inoue , Masashi Chiba

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

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 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

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

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…

Intermediate-mass black holes (IMBHs) have masses of about 100 to 100,000 solar masses. They remain elusive. Observing IMBHs in present-day globular clusters (GCs) would validate a formation channel for seed black holes in the early…

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

The detection of intermediate mass black holes (IMBHs) in Galactic globular clusters (GCs) has so far been controversial. In order to characterize the effectiveness of integrated-light spectroscopy through integral field units, we analyze…

Astrophysics of Galaxies · Physics 2017-04-19 Ruggero de Vita , Michele Trenti , Paolo Bianchini , Abbas Askar , Mirek Giersz , Glenn van de Ven

Contrary to supermassive and stellar-mass black holes (SBHs), the existence of intermediate-mass black holes (IMBHs) with masses ranging between 10^{2-5} Msun has not yet been confirmed. The main problem in the detection is that the…

Cosmology and Nongalactic Astrophysics · Physics 2015-05-30 Symeon Konstantinidis , Pau Amaro-Seoane , Kostas D. Kokkotas

The direct measurement of gravitational waves is a powerful tool for surveying the population of black holes across the universe. The first gravitational wave catalog from LIGO has detected black holes as heavy as $\sim50~M_\odot$,…

General Relativity and Quantum Cosmology · Physics 2020-06-09 Karan Jani , Deirdre Shoemaker , Curt Cutler

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

It has been assumed that intermediate-mass black holes (IMBHs) in globular clusters can only reside in the most centrally concentrated clusters, with a so-called `core-collapsed' density profile. While this would be a natural guess, it is…

Astrophysics · Physics 2009-11-10 Holger Baumgardt , Junichiro Makino , Piet Hut