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When a stellar massive compact object, such as a black hole (BH), inspirals into an intermediate massive black hole (IMBH), an intermediate-mass-ratio-inspiral (IMRI) system forms. Such kind of systems are important sources for space-based…

High Energy Astrophysical Phenomena · Physics 2019-09-04 Xiao-Jun Yue , Zhoujian Cao

It was shown that the dark matter(DM) minihalo around an intermediate mass black hole(IMBH) can be redistributed into a cusp, called the DM minispike. We consider an intermediate-mass-ratio inspiral consisting of an IMBH harbored in a DM…

General Relativity and Quantum Cosmology · Physics 2018-03-16 Xiao-Jun Yue , Wen-Biao Han

Close encounters between two initially unbound objects can result in a binary system if enough energy is released as gravitational waves (GWs). We address the scenario in which such encounters occur in merging elliptical galaxies. There is…

Astrophysics of Galaxies · Physics 2022-11-30 Verónica Vázquez-Aceves , Pau Amaro Seoane , Dana Kuvatova , Maxim Makukov , Chingis Omarov , Denis Yurin

An intermediate mass black hole (IMBH) may have a dark matter (DM) mini-halo around it and develop a spiky structure within less than a parsec from the IMBH. When a stellar mass object is captured by the mini-halo, it eventually infalls…

General Relativity and Quantum Cosmology · Physics 2013-06-03 Kazunari Eda , Yousuke Itoh , Sachiko Kuroyanagi , Joseph Silk

Gravitational waves (GWs) from the inspiral of a neutron star (NS) or stellar-mass black hole (BH) into an intermediate-mass black hole (IMBH) with mass between ~50 and ~350 solar masses may be detectable by the planned advanced generation…

Astrophysics · Physics 2010-11-11 Ilya Mandel , Duncan A. Brown , Jonathan R. Gair , M. Coleman Miller

Cold dark matter may form dense structures around supermassive black holes (SMBHs), significantly influencing their local environments. These dense regions are ideal sites for the formation of extreme mass-ratio inspirals (EMRIs), in which…

Astrophysics of Galaxies · Physics 2025-06-04 Chen Feng , Yong Tang , Yue-Liang Wu

The dark matter (DM) distributed around an intermediate massive black hole (IMBH) forms an overdensity region called DM minispike. We consider the binary system which consists of an IMBH with DM minispike and a small black hole inspiralling…

General Relativity and Quantum Cosmology · Physics 2022-09-14 Ning Dai , Yungui Gong , Tong Jiang , Dicong Liang

Extreme mass ratio inspirals (EMRIs), where a small compact object inspiralls onto a supermassive black hole, are excellent sources for the space-based laser interferometer gravitational wave (GW) detectors. The presence of dark matter…

General Relativity and Quantum Cosmology · Physics 2024-01-10 Chao Zhang , Guoyang Fu , Ning Dai

The exact properties of dark matter remain largely unknown despite the accumulating evidence. If dark matter is composed of weakly interacting massive particles, it would be accreted by the black hole in the galactic center and form a…

Cosmology and Nongalactic Astrophysics · Physics 2022-09-07 Gen-Liang Li , Yong Tang , Yue-Liang Wu

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

Intermediate-mass black holes (IMBHs) have not been detected beyond any reasonable doubt, despite their potential role as massive seeds for quasars and sources of tidal disruption events, ultra-luminous X-ray sources, dwarf galaxy feedback,…

Astrophysics of Galaxies · Physics 2020-07-08 Giacomo Fragione , Abraham Loeb , Kyle Kremer , Frederic A. Rasio

The intermediate-mass-ratio inspirals (IMRIs) may be surrounded by dark matter (DM) minispikes. The dynamical friction from these DM minispike structures can affect the dynamics and the gravitational wave (GW) emission of the IMRIs. We…

High Energy Astrophysical Phenomena · Physics 2025-11-20 Yu-Chen Zhou , Hong-Bo Jin , Cong-Feng Qiao , Yue-Liang Wu

Extreme-mass-ratio inspiral (EMRI) is an important gravitational-wave (GW) source and it normally consists of one stellar-mass black hole (BH) whirling closely around a supermassive black hole (SMBH). In this Letter, we demonstrate that the…

High Energy Astrophysical Phenomena · Physics 2018-10-02 Xian Chen , Wen-Biao Han

Recent studies show that an intermediate mass black hole (IMBH) may develop a dark matter (DM) mini-halo according to some BH formation scenarios. We consider a binary system composed of an IMBH surrounded by a DM mini-spike and a stellar…

General Relativity and Quantum Cosmology · Physics 2015-03-05 Kazunari Eda , Yousuke Itoh , Sachiko Kuroyanagi , Joseph Silk

Extreme mass ratio inspirals (EMRIs) occur when stellar-mass compact objects begin a gravitational wave (GW) driven inspiral into massive black holes. EMRI waveforms can precisely map the surrounding spacetime, making them a key target for…

Astrophysics of Galaxies · Physics 2023-04-27 Ismail Qunbar , Nicholas C. Stone

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

Extreme mass ratio inspirals (EMRIs) are compact binary systems characterized by a mass-ratio $q=m/M$ in the range $~10^{-9}-10^{-4}$ and represent primary gravitational wave (GW) sources for the forthcoming Laser Interferometer Space…

Intermediate-mass ratio inspirals (IMRIs) formed by stellar-mass compact objects orbiting intermediate-mass black holes will be detected by future gravitational wave (GW) observatories like TianQin, LISA, and AION. We study a set of 100…

High Energy Astrophysical Phenomena · Physics 2025-05-22 Alejandro Torres-Orjuela , Verónica Vázquez-Aceves , Tian-Xiao Wang

It was found that the dark matter (DM) in the intermediate-mass-ratio-inspiral (IMRI) system has a significant enhancement effect on the orbital eccentricity of the stellar massive compact object, such as a black hole (BH), which may be…

General Relativity and Quantum Cosmology · Physics 2021-02-03 Meirong Tang , Jiancheng Wang

The extreme mass ratio inspiral (EMRI), defined as a stellar-mass compact object inspiraling into a supermassive black hole (SMBH), has been widely argued to be a low-frequency gravitational wave (GW) source. EMRIs providing accurate…

High Energy Astrophysical Phenomena · Physics 2020-01-08 Y. Y. Wang , F. Y. Wang , Y. C. Zou , Z. G. Dai
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