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Theoretical models for the expected merger rates of intermediate-mass black holes (IMBHs) are vital for planned gravitational-wave detection experiments such as the Laser Interferometer Space Antenna (LISA). Using collisionless $N$-body…

Young massive clusters (YMCs) are the most massive star clusters forming in nearby galaxies and are thought to be a young analogue to the globular clusters. Understanding the formation process of YMCs leads to looking into very efficient…

Astrophysics of Galaxies · Physics 2023-10-27 Mutsuko Inoguchi , Takashi Hosokawa , Hajime Fukushima , Kei E. I. Tanaka , Hidenobu Yajima , Shin Mineshige

We investigate the ability of the Laser Interferometer Space Antenna (LISA) to measure the center of mass acceleration of stellar-origin black hole binaries emitting gravitational waves. Our analysis is based on the idea that the…

Instrumentation and Methods for Astrophysics · Physics 2020-03-05 Nicola Tamanini , Antoine Klein , Camille Bonvin , Enrico Barausse , Chiara Caprini

ESA and NASA are moving forward with plans to launch LISA around 2034. With data from the Illustris cosmological simulation, we provide analysis of LISA detection rates accompanied by characterization of the merging massive black hole…

High Energy Astrophysical Phenomena · Physics 2020-01-08 Michael L. Katz , Luke Zoltan Kelley , Fani Dosopoulou , Samantha Berry , Laura Blecha , Shane L. Larson

We simulate the star cluster, made of stars in the main sequence and different black hole (BH) remnants, around SgrA* at the center of the Milky Way galaxy. Tracking stellar evolution, we find the BH remnant masses and construct the BH mass…

High Energy Astrophysical Phenomena · Physics 2020-03-04 Razieh Emami , Abraham Loeb

We present the first systematic study on how distant weak interactions impact the dynamical evolution of merging binary black holes (BBHs) in dense stellar clusters. Recent studies indicate that dense clusters are likely to significantly…

High Energy Astrophysical Phenomena · Physics 2019-08-21 Johan Samsing , Adrian S. Hamers , Jacob G. Tyles

Coalescence of binary supermassive black holes (SBHs) would constitute the strongest sources of gravitational waves to be observed by LISA. While the formation of binary SBHs during galaxy mergers is almost inevitable, coalescence requires…

Astrophysics · Physics 2015-06-24 David Merritt , Milos Milosavljevic

Stars on eccentric orbits around a massive black hole (MBH) emit bursts of gravitational waves (GWs) at periapse. Such events may be directly resolvable in the Galactic centre. However, if the star does not spiral in, the emitted GWs are…

Earth and Planetary Astrophysics · Physics 2015-05-13 Silvia Toonen , Clovis Hopman , Marc Freitag

The mergers of galaxies and supermassive black holes (SMBHs) are key drivers of galaxy evolution, contributing to the growth of both galaxies and their central black holes. Current and upcoming gravitational wave (GW) detectors -- Pulsar…

Astrophysics of Galaxies · Physics 2025-08-28 Yun Fang , Rong-Gen Cai

The recent evidence of a stochastic background of gravitational waves in the nHz band by pulsar-timing array (PTA) experiments has shed new light on the formation and evolution of massive black hole binaries with masses $\sim 10^8$--$10^9…

Astrophysics of Galaxies · Physics 2023-11-27 Enrico Barausse , Kallol Dey , Marco Crisostomi , Akshay Panayada , Sylvain Marsat , Soumen Basak

Pulsar Timing Array (PTA) experiments worldwide recently reported evidence of a nHz stochastic gravitational wave background (sGWB) compatible with the existence of slowly inspiralling massive black hole (MBH) binaries (MBHBs). The shape of…

Stellar-mass binary black holes will sweep through the frequency band of the Laser Interferometer Space Antenna (LISA) for months to years before appearing in the audio-band of ground-based gravitational-wave detectors. One can expect…

General Relativity and Quantum Cosmology · Physics 2021-02-03 Becca Ewing , Surabhi Sachdev , Ssohrab Borhanian , B. S. Sathyaprakash

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

Our current understanding is that an environment - mainly consisting of gas or stars - is required to bring massive black hole binaries (MBHBs) with total redshifted mass $M_z\sim[10^{4},10^7]~{\rm M}_\odot$ to the LISA band from parsec…

Astrophysics of Galaxies · Physics 2025-01-15 Mudit Garg , Laura Sberna , Lorenzo Speri , Francisco Duque , Jonathan Gair

There has recently been renewed interest in the possibility that the dark matter in the universe consists of primordial black holes (PBHs). Current observational constraints leave only a few PBH mass ranges for this possibility. One of them…

Cosmology and Nongalactic Astrophysics · Physics 2019-06-05 N. Bartolo , V. De Luca , G. Franciolini , A. Lewis , M. Peloso , A. Riotto

Young star clusters are likely the most common birthplace of massive stars across cosmic time and influence the formation of compact binaries in several ways. Here, we simulate the formation of black hole -- neutron star binaries (BHNSs) in…

High Energy Astrophysical Phenomena · Physics 2020-07-22 Sara Rastello , Michela Mapelli , Ugo N. Di Carlo , Nicola Giacobbo , Filippo Santoliquido , Mario Spera , Alessandro Ballone , Giuliano Iorio

We compute the expected gravitational wave signal from coalescing massive black hole (MBH) binaries at the center of galaxies in a hierarchical structure formation scenario in which seed holes of intermediate mass form far up in the dark…

Astrophysics · Physics 2009-11-10 Alberto Sesana , Francesco Haardt , Piero Madau , Marta Volonteri

Massive stellar origin black hole binaries (SBHBs), originating from stars above the pair-instability mass gap, are primary candidates for multiband gravitational wave (GW) observations. Here we study the possibility to use them as…

Cosmology and Nongalactic Astrophysics · Physics 2022-02-16 Niccolò Muttoni , Alberto Mangiagli , Alberto Sesana , Danny Laghi , Walter Del Pozzo , David Izquierdo-Villalba , Mattia Rosati

Black hole-main sequence star (BH-MS) binaries are one of the targets of the future data releases of the astrometric satellite {\it Gaia}. They are supposed to be formed in two main sites: a galactic field and star clusters. However,…

High Energy Astrophysical Phenomena · Physics 2020-05-27 Minori Shikauchi , Jun Kumamoto , Ataru Tanikawa , Michiko S. Fujii

Prior to the detection of black holes (BHs) via the gravitational waves (GWs) they generate at merger, the presence of BHs was inferred in X-ray binaries, mostly via dynamical measurements, with masses in the range between $\sim…

High Energy Astrophysical Phenomena · Physics 2019-06-12 Rosalba Perna , Yi-Han Wang , Will M. Farr , Nathan Leigh , Matteo Cantiello