Separating Accretion and Mergers in the Cosmic Growth of Black Holes with X-ray and Gravitational Wave Observations

  title={Separating Accretion and Mergers in the Cosmic Growth of Black Holes with X-ray and Gravitational Wave Observations},
  author={Fabio Pacucci and Abraham Loeb},
  journal={arXiv: Astrophysics of Galaxies},
Black holes across a broad range of masses play a key role in the evolution of galaxies. The initial seeds of black holes formed at $z \sim 30$ and grew over cosmic time by gas accretion and mergers. Using observational data for quasars and theoretical models for the hierarchical assembly of dark matter halos, we study the relative importance of gas accretion and mergers for black hole growth, as a function of redshift ($0 10^8 \, \mathrm{M_{\odot}}$ and $z>6$; and (ii) growth by mergers is… Expand

Figures and Tables from this paper

Effects of the Hubble Parameter on the Cosmic Growth of the First Quasars
Supermassive black holes (SMBHs) play a crucial role in the evolution of galaxies and are currently detected up to $z\sim 7.5$. Theories describing black hole (BH) growth are challenged by howExpand
Effect of mass-loss due to stellar winds on the formation of supermassive black hole seeds in dense nuclear star clusters
The observations of high redshifts quasars at z & 6 have revealed that supermassive black holes (SMBHs) of mass∼ 109M were already in place within the first ∼ Gyr after the Big Bang. SupermassiveExpand
Origins and demographics of wandering black holes
We characterise the population of wandering black holes, defined as those physically offset from their halo centres, in the Romulus cosmological simulations. Unlike most other currently availableExpand
Properties of ultralight bosons from heavy quasar spins via superradiance
The mass and the spin of accreting and jetted black holes, at the center of Active Galactic Nuclei (AGNs), can be probed by analyzing their electromagnetic spectra. For this purpose, we use theExpand
Formation of supermassive black hole seeds in nuclear star clusters via gas accretion and runaway collisions
More than two hundred supermassive black holes (SMBHs) of masses $\gtrsim 10^9\mathrm{M_{\odot}}$ have been discovered at $z \gtrsim 6$. One promising pathway for the formation of SMBHs is throughExpand
Gravitational-wave Lunar Observatory for Cosmology
Several large-scale experimental facilities and space-missions are being suggested to probe the universe across the spectrum. Here we propose - the first concept design in the NASA Artemis era for aExpand
Inception of a first quasar at cosmic dawn
Earliest quasars at the cosmic dawn are powered by mass accretion onto supermassive black holes of a billion solar masses. Massive black hole seeds forming through the direct collapse mechanism areExpand


Observing black holes spin
The spin of a black hole retains the memory of how the black hole grew, and can be a potent source of energy for powering relativistic jets. To understand the diagnostic power and astrophysicalExpand
The Advanced X-ray Imaging Satellite
Much of the baryonic matter in the Universe, including the most active and luminous sources, are best studied in the X-ray band. Key advances in X-ray optics and detectors have paved the way for theExpand
The evolution of massive black holes and their spins in their galactic hosts
Future space-based gravitational-wave detectors, such as the Laser Interferometer Space Antenna (LISA/SGO) or a similar European mission (eLISA/NGO), will measure the masses and spins of massiveExpand
Cosmological Black Hole Spin Evolution by Mergers and Accretion: Implications for Gravitational Wave Astronomy
Using recent results from numerical relativity simulations of black hole mergers, we revisit previous studies ofExpand
An 800-million-solar-mass black hole in a significantly neutral Universe at a redshift of 7.5
Strong evidence of absorption of the spectrum of the quasar redwards of the Lyman α emission line (the Gunn–Peterson damping wing), as would be expected if a significant amount of the hydrogen in the intergalactic medium surrounding J1342 + 0928 is neutral, and a significant fraction of neutral hydrogen is derived, although the exact fraction depends on the modelling. Expand
Initial mass function of intermediate-mass black hole seeds
We study the initial mass function (IMF) and hosting halo properties of intermediate-mass black holes (IMBHs, 104-6 M⊙) formed inside metal-free, UV-illuminated atomic-cooling haloes (virialExpand
Using a new large-scale (~ 0.75 Gpc)3 hydrodynamic cosmological simulation, we investigate the growth rate of supermassive black holes (BHs) in the early universe (z 4.75). Remarkably we find a clearExpand
Evolution of binary black-hole spacetimes.
Early success is described in the evolution of binary black-hole spacetimes with a numerical code based on a generalization of harmonic coordinates capable of evolving binary systems for enough time to extract information about the orbit, merger, and gravitational waves emitted during the event. Expand
Spin, accretion, and the cosmological growth of supermassive black holes
If supermassive black holes (SMBHs) are the energy sources that power quasars and active galactic nuclei (AGNs), then QSO SDSS 1148+5251, the quasar with the highest redshift (zQSO = 6.43), hosts anExpand
Black Hole Mass and Spin Coevolution by Mergers
Massive black holes appear to be present in the nuclei of almost all galaxies, but their genesis and evolution are not well understood. As astrophysical black holes are completely characterized byExpand