Intermediate-Mass Black Holes

  title={Intermediate-Mass Black Holes},
  author={Jenny E. Greene and Jay Strader and Luis C. Ho},
  journal={arXiv: Astrophysics of Galaxies},
We describe ongoing searches for intermediate-mass black holes with M_BH ~ 100-10^5 M_sun. We review a range of search mechanisms, both dynamical and those that rely on accretion signatures. We find that dynamical and accretion signatures alike point to a high fraction of 10^9-10^10 M_sun galaxies hosting black holes with M_BH<10^5 M_sun. In contrast, there are no solid detections of black holes in globular clusters. There are few observational constraints on black holes in any environment with… 
Feeding and feedback from little monsters: AGN in dwarf galaxies
  • M. Mezcua
  • Physics
    Proceedings of the International Astronomical Union
  • 2019
Abstract Detecting the seed black holes from which quasars formed is extremely challenging; however, those seeds that did not grow into supermassive should be found as intermediate-mass black holes
mocca-survey Database I: Binary black hole mergers from globular clusters with intermediate mass black holes
The dynamical formation of black hole binaries in globular clusters that merge due to gravitational waves occurs more frequently in higher stellar density. Meanwhile, the probability to form
Revealing the intermediate-mass black hole at the heart of the dwarf galaxy NGC 404 with sub-parsec resolution ALMA observations
We estimate the mass of the intermediate-mass black hole at the heart of the dwarf elliptical galaxy NGC 404 using Atacama Large Millimeter/submillimeter Array (ALMA) observations of the molecular
VLA Limits on Intermediate-mass Black Holes in 19 Massive Globular Clusters
The NSF's Karl G.\ Jansky Very Large Array (VLA) was used at 3~cm to search for accretion signatures from intermediate-mass black holes (IMBHs) in 19 globular star clusters (GCs) in NGC\,3115, an
The Interplay between Star Formation and Black Hole Accretion in Nearby Active Galaxies
Black hole accretion is widely thought to influence star formation in galaxies, but the empirical evidence for a physical correlation between star formation rate (SFR) and the properties of active
The Correlation between Black Hole Mass and Stellar Mass for Classical Bulges and the Cores of Ellipticals
The correlation between black hole mass and the stellar mass of the bulge of the host galaxy has attracted much attention ever since its discovery. While traditional investigations of this
Does NGC 6397 contain an intermediate-mass black hole or a more diffuse inner subcluster?
We analyze proper motions from the Hubble Space Telescope (HST) and the second Gaia data release along with line-of-sight velocities from the MUSE spectrograph to detect imprints of an
Detecting intermediate-mass black holes in Milky Way globular clusters and the Local Volume with LISA and other gravitational wave detectors
The next generation of gravitational wave (GW) observatories would enable the detection of intermediate mass ratio inspirals (IMRIs), tight binaries composed of an intermediate-mass black hole (IMBH)
A little FABLE: exploring AGN feedback in dwarf galaxies with cosmological simulations
Contrary to the standard lore, there is mounting observational evidence that feedback from active galactic nuclei (AGN) may also play a role at the low-mass end of the galaxy population. We
Binary Intermediate-mass Black Hole Mergers in Globular Clusters
We consider the formation of binary intermediate black holes (BIMBH) in globular clusters (GC), which could happen either in situ or due to the mergers between clusters. We simulate the evolution of


Astro2020 Science White Paper: The Local Relics of of Supermassive Black Hole Seeds
We have compelling evidence for stellar-mass black holes (BHs) of ~5-80 M_sun that form through the death of massive stars. We also have compelling evidence for so-called supermassive BHs (10^5-10^10
An Arena for Multi-Messenger Astrophysics: Inspiral and Tidal Disruption of White Dwarfs by Massive Black Holes
The tidal disruption of stars by (super-)massive black holes in galactic nuclei has been discussed in theoretical terms for about 30 years but only in the past decade have we been able to detect such
Electromagnetic Window into the Dawn of Black Holes
Massive 10^6-10^10 Msun black holes (BHs) are ubiquitous in local galactic nuclei. They were common by the time the Universe is several Gyr old, and many of them were in place within the first 1~Gyr
The unique potential of extreme mass-ratio inspirals for gravitational-wave astronomy
The inspiral of a stellar-mass compact object into a massive ($\sim 10^{4}$-$10^{7} M_{\odot}$) black hole produces an intricate gravitational-wave signal. Due to the extreme-mass ratios involved,
Research Update on Extreme-Mass-Ratio Inspirals
The inspirals of stellar-mass mass compact objects into massive black holes in the centres of galaxies are one of the most important sources of gravitational radiation for space- based detectors like
A next-generation Very Large Array
  • E. Murphy
  • Physics, Computer Science
    Proceedings of the International Astronomical Union
  • 2017
The ngVLA will tackle a broad range of outstanding questions in modern astronomy by simultaneously delivering the capability to unveil the formation of Solar System analogues, probe the initial conditions for planetary systems and life with astrochemistry, and characterize the assembly, structure, and evolution of galaxies from the first billion years to the present.
Stellar mass derived using Bell et al
  • K−band magnitude
  • 2018
Distance (Mpc). Column (3): Black hole mass determination method. Column (4): Black hole mass
  • Star cluster mass,
  • 2015
2019), based on depth, we can expect ∼ 10 events per year
  • 2019
2019), based on depth, we can expect ∼ 10 events per year
  • 2019