Rapid Growth of Galactic Supermassive Black Holes through Accreting Giant Molecular Clouds during Major Mergers of their Host Galaxies

Abstract

Understanding the formation of the supermassive black holes (SMBHs) present in the centers of galaxies is a crucial topic in modern astrophysics. Observations have detected the SMBHs with mass $M$ of $10^9{\mathrm{M}}_{\odot }$ in the high-redshift galaxies with $\mathrm{z}\sim 7$. However, how SMBHs grew to such huge masses within the first billion years after the big bang remains elusive. One possible explanation is that SMBHs grow quickly through the frequent mergers of galaxies, which provides sustainable gas to maintain rapid growth. This study presents the hydrodynamics simulations of the SMBHs' growth with their host galaxies using the GIZMO code. In contrast to previous simulations, we have developed a giant molecular cloud (GMC) model by separating molecular-gas particles from the atomic-gas particles and then evolving them independently. During major mergers, we show that the more massive molecular gas particles cloud bear stronger dynamical friction. Consequently, GMCs are substantially accreted onto the galactic centers that grow SMBHs from $\sim 10^7$ ${\mathrm{M}}_{\odot }$ to $\sim 10^9{\mathrm{M}}_{\odot }$ within $300$ Myr, explaining the rapid growth of SMBHs, and this accretion also triggers a violent starburst at the galactic center. Furthermore, we examine the impact of minor mergers on the bulge of a Milky-Way-like galaxy and find that the size and mass of the bulge can increase from $0.92$ kpc to $1.9$ kpc and from $4.7\times 10^{10}{\mathrm{M}}_{\odot }$ to $7\times 10^{10}{\mathrm{M}}_{\odot }$.

arXiv comment17 pages, 9 figures. Accepted for publication in ApJ

References in corpus (59)

• SciPy 1.0--Fundamental Algorithms for Scientific Computing in Python
• The cosmological simulation code GADGET-2
• A Fundamental Relation Between Supermassive Black Holes and Their Host Galaxies
• The Demography of Massive Dark Objects in Galaxy Centres
• Energy input from quasars regulates the growth and activity of black holes and their host galaxies
• Cosmological SPH simulations: A hybrid multi-phase model for star formation
• Gaia Data Release 1. Summary of the astrometric, photometric, and survey properties
• The Relation between Black Hole Mass, Bulge Mass, and Near-Infrared Luminosity
• On the Black Hole Mass - Bulge Mass Relation
• A luminous quasar at a redshift of z = 7.085
• The Galactic Center Massive Black Hole and Nuclear Star Cluster
• GIZMO: A New Class of Accurate, Mesh-Free Hydrodynamic Simulation Methods
• FIRE-2 Simulations: Physics versus Numerics in Galaxy Formation
• A model for cosmological simulations of galaxy formation physics
• The Galactic disk mass function: reconciliation of the HST and nearby determinations
• Relations Between Central Black Hole Mass and Total Galaxy Stellar Mass in the Local Universe
• Black holes in galaxy mergers: The formation of red elliptical galaxies
• SPLASH: An interactive visualisation tool for Smoothed Particle Hydrodynamics simulations
• The Assembly of the First Massive Black Holes
• On the black hole - bulge mass relation in active and inactive galaxies
• How Do Massive Black Holes Get Their Gas?
• Mergers and Bulge Formation in Lambda-CDM: Which Mergers Matter?
• A Correlation between Galaxy Light Concentration and Supermassive Black Hole Mass
• Galaxy mergers with various mass ratios: properties of remnants
• A Cosmic UV/X-ray Background Model Update
• Quasar Outflow Contribution to AGN Feedback: Observations of QSO SDSS J0838+2955
• Mass and shape of the Milky Way's dark matter halo with globular clusters from Gaia and Hubble
• Stellar and Quasar Feedback in Concert: Effects on AGN Accretion, Obscuration, and Outflows
• Evolution of the atomic and molecular gas content of galaxies
• Titans of the Early Universe: The Prato Statement on the Origin of the First Supermassive Black Holes
• Evolution of supermassive stars as a pathway to black hole formation
• When Feedback Fails: The Scaling and Saturation of Star Formation Efficiency
• The identification of z-dropouts in Pan-STARRS1: three quasars at 6.5<z<6.7
• On the rate of core collapse supernovae in the Milky Way
• The AGORA High-Resolution Galaxy Simulations Comparison Project. II: Isolated Disk Test
• Simulating the interstellar medium and stellar feedback on a moving mesh: Implementation and isolated galaxies
• Major contributor to AGN feedback: VLT X-shooter observations of SIV BAL QSO outflows
• FIRE-3: Updated Stellar Evolution Models, Yields, & Microphysics and Fitting Functions for Applications in Galaxy Simulations
• The Galactic Center Molecular Cloud Survey. I. A Steep Linewidth-Size Relation & Suppression of Star Formation
• Toward First-Principle Simulations of Galaxy Formation: II. Shock-Induced Starburst at a Collision Interface During the First Encounter of Interacting Galaxies
• Effect of galaxy mergers on star formation rates
• Evolution of the mass, size, and star formation rate in high-redshift merging galaxies MIRAGE - A new sample of simulations with detailed stellar feedback
• Zooming in on major mergers: dense, starbursting gas in cosmological simulations
• The effect of ram pressure on the molecular gas of galaxies: three case studies in the Virgo cluster
• Major Galaxy Mergers and the Growth of Supermassive Black Holes in Quasars
• When and where did GW150914 form?
• A minor merger origin for stellar inner discs and rings in spiral galaxies
• A general theory for the lifetimes of giant molecular clouds under the influence of galactic dynamics
• What is the Accretion Rate in Sgr A*?
• General Relativistic Instability Supernova of a Supermassive Population III Star
• Do Circumnuclear Dense Gas Disks Drive Mass Accretion onto Supermassive Black Holes?
• Modeling the Milky Way as a Dry Galaxy
• Formation of supermassive black hole seeds in nuclear star clusters via gas accretion and runaway collisions
• The Effect of Many Minor Mergers on the Size Growth of Compact Quiescent Galaxies
• Molecular Gas Feeding the Circumnuclear Disk of the Galactic Center
• The spatially resolved star formation history of mergers: A comparative study of the LIRGs IC1623, NGC6090, NGC2623, and Mice
• Super-Eddington growth of black holes in the early Universe: effects of disk radiation spectra
• On black hole masses, radio-loudness and bulge luminosities of Seyfert galaxies
• The SMBH mass versus M_G sigma^2 relation: A comparison between real data and numerical models

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