Growth of Massive Black Hole Seeds by Migration of Stellar and Primordial Black Holes: Gravitational Waves and Stochastic Background

Abstract

We investigate the formation and growth of massive black hole (BH) seeds in dusty star-forming galaxies, relying and extending the framework proposed by Boco et al. 2020. Specifically, the latter envisages the migration of stellar compact remnants (neutron stars and stellar-mass black holes) via gaseous dynamical friction towards the galaxy nuclear region, and their subsequent merging to grow a massive central BH seed. In this paper we add two relevant ingredients: (i) we include primordial BHs, that could constitute a fraction $f_{\mathrm{pBH}}$ of the dark matter, as an additional component participating in the seed growth; (ii) we predict the stochastic gravitational wave background originated during the seed growth, both from stellar compact remnant and from primordial BH mergers. We find that the latter events contribute most to the initial growth of the central seed during a timescale of $10^6-10^7\mathrm{yr}$, before stellar compact remnant mergers and gas accretion take over. In addition, if the fraction of primordial BHs $f_{\mathrm{pBH}}$ is large enough, gravitational waves emitted by their mergers in the nuclear galactic regions could be detected by future interferometers like Einsten Telescope, DECIGO and LISA. As for the associated stochastic gravitational wave background, we predict that it extends over the wide frequency band $10^{-6}\lesssim f[\mathrm{Hz}]\lesssim 10$, which is very different from the typical range originated by mergers of isolated binary compact objects. On the one hand, the detection of such a background could be a smoking gun to test the proposed seed growth mechanism; on the other hand, it constitutes a relevant contaminant from astrophysical sources to be characterized and subtracted, in the challenging search for a primordial background of cosmological origin.

36 pages, 11 figures

References in corpus (24)

• Gravitational Waves and Gamma-rays from a Binary Neutron Star Merger: GW170817 and GRB 170817A
• GWTC-2: Compact Binary Coalescences Observed by LIGO and Virgo During the First Half of the Third Observing Run
• A Highly Consistent Framework for the Evolution of the Star-Forming "Main Sequence" from z~0-6
• GW190521: A Binary Black Hole Merger with a Total Mass of $150M_{\odot }$
• A gravitational-wave standard siren measurement of the Hubble constant
• Gravitational-wave sensitivity curves
• Rapid Formation of Supermassive Black Hole Binaries in Galaxy Mergers with Gas
• First measurement of the Hubble constant from a dark standard siren using the Dark Energy Survey galaxies and the LIGO/Virgo binary-black-hole merger GW170814
• A fitting formula for the merger timescale of galaxies in hierarchical clustering
• The SCUBA-2 Cosmology Legacy Survey: ALMA resolves the bright-end of the sub-millimeter number counts
• The cosmic merger rate density of compact objects: impact of star formation, metallicity, initial mass function and binary evolution
• Hierarchical black hole mergers in young, globular and nuclear star clusters: the effect of metallicity, spin and cluster properties
• Bulge-forming galaxies with an extended rotating disk at z~2
• Galaxy Evolution in the Radio Band: The Role of Starforming Galaxies and Active Galactic Nuclei
• Host galaxies of merging compact objects: mass, star formation rate, metallicity and colours
• An ALMA survey of the S2CLS UDS field: Optically invisible submillimetre galaxies
• Revealing the Stellar Mass and Dust Distributions of Submillimeter Galaxies at Redshift 2
• The imprint of massive black-hole mergers on the correlation between nuclear clusters and their host galaxies
• Host galaxy properties of mergers of stellar binary black holes and their implications for advanced LIGO gravitational wave sources
• Evolution of Galaxy Star Formation and Metallicity: Impact on Double Compact Objects Mergers
• Exploring galaxies-gravitational waves cross-correlations as an astrophysical probe
• Reconstruction of Primordial Power Spectrum of curvature perturbation from the merger rate of Primordial Black Hole Binaries
• Intensity and anisotropies of the stochastic Gravitational Wave background from merging compact binaries in galaxies
• Angular Momentum of Early and Late Type Galaxies: Nature or Nurture?

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• Exploring the multiband gravitational wave background with a semi-analytic galaxy formation model
• Growth of A Massive Black Hole Via Tidal Disruption Accretion
• Stellar population modelling of neutron stars and black holes: spatially-resolved graveyards in MaNGA/SDSS-IV galaxies