Dynamics of Intermediate-Mass Black Holes Wandering in the Milky Way Galaxy Using the Illustris TNG50 Simulation

Abstract

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 ($\sim 3{\mathrm{M}}_{\odot }$ to $\sim 5\times 10^{10}{\mathrm{M}}_{\odot }$). IMBHs originally located at the center of dwarfs that later collide with the Milky Way (MW) could be wandering, undetected, in our Galaxy. We used TNG50, the highest-resolution run of the IllustrisTNG project, to study the kinematics and dynamics of star clusters, in the appropriate mass range, acting as IMBH proxies in a MW analog galaxy. We showed that $\sim 87\%$ of our studied IMBHs drift inward. The radial velocity of these sinking IMBHs has a median magnitude of $\sim 0.44\mathrm{ckpc}{\mathrm{h}}^{-1}\mathrm{Gy}{\mathrm{r}}^{-1}$ and no dependence on the black hole mass. The central $1\mathrm{ckpc}{\mathrm{h}}^{-1}$ has the highest number density of IMBHs in the galaxy. A physical toy model with linear drag forces was developed to explain the orbital circularization with time. These findings constrain the spatial distribution of IMBHs, suggesting that future searches should focus on the central regions of the Galaxy. Additionally, we found that the 3D velocity distribution of IMBHs with respect to the galactic center has a mean of $\sim 180\mathrm{km}{\mathrm{s}}^{-1}$ and larger variance with decreasing radius. Remarkably, the velocity distribution relative to the local gas shows significantly lower values, with a mean of $\sim 88\mathrm{km}{\mathrm{s}}^{-1}$. These results are instrumental for predicting the accretion and radiation properties of IMBHs, facilitating their detection with future surveys.

arXiv commentAccepted for publication in MNRAS. This is the final version of the manuscript. 10 pages, 12 figures

References in corpus (65)

• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• First M87 Event Horizon Telescope Results. I. The Shadow of the Supermassive Black Hole
• Coevolution (Or Not) of Supermassive Black Holes and Host Galaxies
• A Relationship Between Nuclear Black Hole Mass and Galaxy Velocity Dispersion
• E pur si muove: Galiliean-invariant cosmological hydrodynamical simulations on a moving mesh
• Advection-Dominated Accretion: A Self-Similar Solution
• Simulating Galaxy Formation with the IllustrisTNG Model
• First results from the IllustrisTNG simulations: matter and galaxy clustering
• First results from the IllustrisTNG simulations: the stellar mass content of groups and clusters of galaxies
• Advection-Dominated Accretion: Underfed Black Holes and Neutron Stars
• Measuring Distance and Properties of the Milky Way's Central Supermassive Black Hole with Stellar Orbits
• First results from the IllustrisTNG simulations: the galaxy color bimodality
• Hot Accretion Flows Around Black Holes
• Laser Interferometer Space Antenna
• First results from the IllustrisTNG simulations: A tale of two elements -- chemical evolution of magnesium and europium
• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• First results from the IllustrisTNG simulations: radio haloes and magnetic fields
• First Results from the TNG50 Simulation: Galactic outflows driven by supernovae and black hole feedback
• First Results from the TNG50 Simulation: The evolution of stellar and gaseous disks across cosmic time
• Intermediate-Mass Black Holes
• The runaway growth of intermediate-mass black holes in dense star clusters
• Thermal Equilibria of Accretion Disks
• Three-dimensional MHD Simulations of Radiatively Inefficient Accretion Flows
• Advection-Dominated Accretion and the Black Hole Event Horizon
• A Luminous Quasar at Redshift 7.642
• Formation of Massive Black Holes in Dense Star Clusters. I. Mass Segregation and Core Collapse
• Rapid Formation of Supermassive Black Hole Binaries in Galaxy Mergers with Gas
• The radial velocity dispersion profile of the Galactic halo: Constraining the density profile of the dark halo of the Milky Way
• Discovery of a Candidate Black Hole - Giant Star Binary System in the Galactic Field
• Kraken reveals itself -- the merger history of the Milky Way reconstructed with the E-MOSAICS simulations
• A Cluster of Black Holes at the Galactic Center
• A ~50,000 solar mass black hole in the nucleus of RGG 118
• Rapid growth of seed black holes in the early universe by supra-exponential accretion
• Accretion of low angular momentum material onto black holes: 2D magnetohydrodynamical case
• Improved Dynamical Constraints on the Masses of the Central Black Holes in Nearby Low-mass Early-type Galactic Nuclei And the First Black Hole Determination for NGC 205
• The velocity dispersion and mass profile of the Milky Way
• Massive black hole factories: Supermassive and quasi-star formation in primordial halos
• The erratic dynamical life of black hole seeds in high-redshift galaxies
• Wandering Black Holes in Bright Disk Galaxy Halos
• Quasistars and the cosmic evolution of massive black holes
• Gravitational Waves and Intermediate-mass Black Hole Retention in Globular Clusters
• Dynamical friction and the evolution of Supermassive Black hole Binaries: the final hundred-parsec problem
• Intermediate-mass Black Holes from High Massive-star Binary Fractions in Young Star Clusters
• Dancing to ChaNGa: A Self-Consistent Prediction For Close SMBH Pair Formation Timescales Following Galaxy Mergers
• A new channel to form IMBHs throughout cosmic time
• Velocity Dispersion Profile of the Milky Way Halo
• On the Assembly of Dwarf Galaxies in Clusters and their Efficient Formation of Globular Clusters
• X-ray bubbles in the circumgalactic medium of TNG50 Milky Way- and M31-like galaxies: signposts of supermassive black hole activity
• Origins and Demographics of Wandering Black Holes
• The abundance of satellites around Milky Way- and M31-like galaxies with the TNG50 simulation: a matter of diversity
• Populating the low-mass end of the $M_{\mathrm{BH}}-{\sigma }_{\ast }$ relation
• Counting Black Holes: The Cosmic Stellar Remnant Population and Implications for LIGO
• Seeds Don't Sink: Even Massive Black Hole "Seeds" Cannot Migrate to Galaxy Centers Efficiently
• The fate of central black holes in merging galaxies
• Separating Accretion and Mergers in the Cosmic Growth of Black Holes with X-ray and Gravitational Wave Observations
• Intermediate-mass black holes from Population III remnants in the first galactic nuclei
• Glimmering in the dark: modeling the low-mass end of the $M_{\bullet }-\sigma$ relation and of the quasar luminosity function
• Unveiling the Population of Wandering Black Holes via Electromagnetic Signatures
• The Active Fraction of Massive Black Holes in Dwarf Galaxies
• Hubble Space Telescope Imaging of the Active Dwarf Galaxy RGG 118
• Dynamical friction-driven orbital circularisation in rotating discs: a semi-analytical description
• Ultramassive black holes in the most massive galaxies: $M_{\mathrm{BH}}-\sigma$ versus $M_{\mathrm{BH}}-R_{\mathrm{b}}$
• The mass budget for intermediate-mass black holes in dense star clusters
• Characterizing the velocity of a wandering black hole and properties of the surrounding medium using convolutional neural networks
• Modelling mass distribution of the Milky Way galaxy using Gaia billion-star map

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• Satellites of Milky Way- and M31-like galaxies with TNG50: quenched fractions, gas content, and star formation histories
• Probing the $z\gtrsim 6$ quasars in a universe with IllustrisTNG physics: Impact of gas-based black hole seeding models
• A New Discrete Dynamical Friction Estimator Based on $N$-body Simulations
• Detectability of Wandering Intermediate-Mass Black Holes in the Milky Way Galaxy from Radio to X-rays
• Orbital and Radiative Properties of Wandering Intermediate-Mass Black Holes in the ASTRID Simulation
• Observational Signatures of Massive Black Hole Progenitor Pathways: Could Leo I a Smoking Gun?
• Identification of Intermediate-mass Black Hole Candidates Among a Sample of Sd Galaxies
• Multi-scale VLBI observations of the candidate host galaxy of GRB 200716C
• Intermediate Mass Ratio Inspirals in Milky Way Galaxies
• Tracing black hole and galaxy growth across environments since cosmic noon