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Using the Next Generation Very Large Array (ngVLA), we will make a comprehensive inventory of intermediate-mass black holes (IMBHs) in hundreds of globular cluster systems out to a distance of 25 Mpc. IMBHs have masses of about 100 to…

Astrophysics of Galaxies · Physics 2018-06-18 J. M. Wrobel , J. C. A. Miller-Jones , K. E. Nyland , T. J. Maccarone

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

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

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

Theoretical models predict that intermediate-mass black holes (IMBHs) exist in globular clusters (GCs), but observational evidence remains elusive. Millisecond pulsars (MSPs), which are abundant in GCs and have served as precise probes for…

High Energy Astrophysical Phenomena · Physics 2025-07-15 Xian Chen , Verónica Vázquez-Aceves , Siyuan Chen , Kejia Lee , Yanjun Guo , Kuo Liu

Intermediate-mass black holes (IMBHs) may provide the missing link to understanding the growth of supermassive black holes in the early Universe. Some formation scenarios predict that IMBHs could have formed by runaway collisions in…

Astrophysics of Galaxies · Physics 2015-06-17 Nora Lützgendorf , Holger Baumgardt , J. M. Diederik Kruijssen

We model the inspiral of globular clusters (GCs) towards a galactic nucleus harboring a supermassive black hole (SMBH), a leading scenario for the formation of nuclear star clusters. We consider the case of GCs containing either an…

Astrophysics of Galaxies · Physics 2018-04-18 Manuel Arca Sedda , Alessia Gualandris

We explore several correlations between various large-scale galaxy properties, particularly total globular cluster population (N_GCS), the central black hole mass (M_BH), velocity dispersion (nominally sigma_e), and bulge mass (M_dyn). Our…

Astrophysics of Galaxies · Physics 2015-06-18 Gretchen L. H. Harris , Gregory B. Poole , William E. Harris

We study the binary fraction of the globular cluster M10 (NGC 6254) as a function of radius from the cluster core to the outskirts, by means of a quan- titative analysis of the color distribution of stars relative to the fiducial main…

Solar and Stellar Astrophysics · Physics 2015-05-30 E. Dalessandro , B. Lanzoni , G. Beccari , A. Sollima , F. R. Ferraro , M. 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

Gravitational waves (GWs) offer an unprecedented opportunity to survey the sky and detect mergers of compact objects. While intermediate-mass black holes (IMBHs) have not been detected beyond any reasonable doubt with either dynamical or…

High Energy Astrophysical Phenomena · Physics 2022-11-16 Giacomo Fragione

There is growing evidence that intermediate-mass black holes (IMBHs), defined here as having a mass in the range M=500-10^5 Msun, are present in the dense centers of certain globular clusters (GCs). Gravitational waves (GWs) from their…

High Energy Astrophysical Phenomena · Physics 2018-06-20 Ely D. Kovetz , Ilias Cholis , Marc Kamionkowski , Joseph Silk

Recent studies suggest that globular clusters (GCs) may retain a substantial population of stellar-mass black holes (BHs), in contrast to the long-held belief of a few to zero BHs. We model the population of BH low-mass X-ray binaries…

High Energy Astrophysical Phenomena · Physics 2018-03-28 Matthew Giesler , Drew Clausen , Christian D. Ott

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

Stars often reside in binary configurations. The nuclear star cluster surrounding the supermassive black hole (SMBH) in the Galactic Center (GC) is expected to include a binary population. In this dense environment, a binary frequently…

Solar and Stellar Astrophysics · Physics 2020-12-02 Sanaea C. Rose , Smadar Naoz , Abhimat K. Gautam , Andrea M. Ghez , Tuan Do , Devin Chu , Eric Becklin

The formation of supermassive black holes at high redshift still remains a puzzle to astronomers. Their growth becomes reasonable only when starting from a massive seed black hole with mass of the order of 10^2 - 10^5 M_SUN.…

Intermediate mass black holes (IMBHs) have masses between the $10^2\!-\!10^6$ M$_\odot$ and are key to our understanding of the formation of massive black holes. The known population of IMBH remains small, with a few hundred candidates and…

Astrophysics of Galaxies · Physics 2020-02-12 Jorge Martínez-Palomera , Paulina Lira , India Bhalla-Ladd , Francisco Förster , Richard M. Plotkin

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

Globular clusters (GCs) are found in all types of galaxies and harbor some of the most extreme stellar systems, including black holes that may dynamically assemble into merging binaries (BBHs). Uncertain GC properties, including when they…

Astrophysics of Galaxies · Physics 2023-05-17 Maya Fishbach , Giacomo Fragione

Globular clusters may host intermediate mass black holes (IMBHs) at their centres. Here we propose a new method for their identification using millisecond pulsars (MSPs) as probes. We show that measuring the first (jerk) and second (jounce)…

High Energy Astrophysical Phenomena · Physics 2019-05-22 Federico Abbate , Mario Spera , Monica Colpi