Binary Black Hole Mergers and Intermediate-mass Black Holes in Dense Star Clusters with Collisional Runaways [PDF]
The Astronomical JournalIntermediate-mass black holes (IMBHs) are believed to be the missing link between the supermassive black holes (BHs) found at the centers of massive galaxies and BHs formed through stellar core collapse. One of the proposed mechanisms for their formation
Rujuta A. Purohit +4 more
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Identification of Intermediate-mass Black Hole Candidates among a Sample of Sd Galaxies [PDF]
The Astrophysical JournalWe analyzed images of every northern hemisphere Sd galaxy listed in the Third Reference Catalogue of Bright Galaxies with a relatively face-on inclination ( θ ≤ 30°). Specifically, we measured the spiral arms’ winding angle, ϕ , in 85 galaxies.
Benjamin L. Davis +6 more
doaj +2 more sources
Weighing the black holes in ultraluminous X-ray sources through timing [PDF]
, 2008 We describe a new method to estimate the mass of black holes in Ultraluminous X-ray Sources (ULXs). The method is based on the recently discovered ``variability plane'', populated by Galactic stellar-mass black-hole candidates (BHCs) and supermassive ...
Belloni, T. +5 more
core +12 more sources
Partial Tidal Disruptions of Main-sequence Stars by Intermediate-mass Black Holes
The Astrophysical Journal, 2023 We study close encounters of a 1 M _⊙ middle-age main-sequence star (modeled using MESA) with massive black holes through hydrodynamic simulations, and explore in particular the dependence of the outcomes on the black hole mass.
Fulya Kıroğlu +5 more
doaj +1 more source
Constraining a Companion of the Galactic Center Black Hole Sgr A*
The Astrophysical Journal, 2023 We use 23 yr of astrometric and radial velocity data on the orbit of the star S0-2 to constrain a hypothetical intermediate-mass black hole orbiting the massive black hole Sgr A* at the Galactic center.
Clifford M. Will +6 more
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Multi-Messenger Astrophysics of a Millisecond Pulsar Orbiting around a Massive Black Hole
Universe, 2022 Extreme-mass-ratio and intermediate-mass-ratio binaries with a millisecond pulsar are gravitational-wave sources that emit also electromagnetic radiation.
Kinwah Wu
doaj +1 more source
Semiclassical S $$ \mathcal{S} $$ -matrix and black hole entropy in dilaton gravity
Journal of High Energy Physics, 2020 We use complex semiclassical method to compute scattering amplitudes of a point particle in dilaton gravity with a boundary. This model has nonzero minimal black hole mass M cr . We find that at energies below M cr the particle trivially scatters off the
Maxim Fitkevich +2 more
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Discovery of a Planar Black Hole Mass Scaling Relation for Spiral Galaxies
The Astrophysical Journal Letters, 2023 Supermassive black holes (SMBHs) are tiny in comparison to the galaxies they inhabit, yet they manage to influence and coevolve along with their hosts.
Benjamin L. Davis, Zehao Jin
doaj +1 more source
Radio Detections During Two State Transitions of the Intermediate Mass Black Hole HLX-1 [PDF]
, 2012 Relativistic jets are streams of plasma moving at appreciable fractions of the speed of light. They have been observed from stellar mass black holes ($\sim$3$-$20 solar masses, M$_\odot$) as well as supermassive black holes ($\sim$10$^6$$-$10$^9$ M$_ ...
Barret, Didier +9 more
core +6 more sources
The Astrophysical Journal, 2023 X-ray spectroscopy of Galactic black hole binaries serves as a powerful tool to gain an overall understanding of the system. Not only can the properties of the accretion disk be studied in detail, the fundamental properties of the black hole such as spin
Sandeep K. Rout +3 more
doaj +1 more source