Convection-dominated accretion flows

Eliot Quataert, Andrei Gruzinov

    Research output: Contribution to journalArticle

    Abstract

    Nonradiating advection-dominated accretion flows are convectively unstable in the radial direction. We calculate the two-dimensional (r-θ) structure of such flows assuming that (1) convection transports angular momentum inward, opposite to normal viscosity, and (2) viscous transport by other mechanisms (e.g., magnetic fields) is weak (α ≪ 1). Under such conditions convection dominates the dynamics of the accretion flow and leads to a steady state structure that is marginally stable to convection. We show that the marginally stable flow has a constant temperature and rotational velocity on spherical shells, a net flux of energy from small to large radii, zero net accretion rate, and a radial density profile of ρ ∝ r-1/2, flatter than the ρ ∝ r-3/2 profile characteristic of spherical accretion flows. This solution accurately describes the full two-dimensional structure of recent axisymmetric numerical simulations of advection-dominated accretion flows.

    Original languageEnglish (US)
    Pages (from-to)809-814
    Number of pages6
    JournalAstrophysical Journal
    Volume539
    Issue number2 PART 1
    StatePublished - Aug 20 2000

    Fingerprint

    convection
    accretion
    advection
    spherical shells
    profiles
    angular momentum
    viscosity
    shell
    magnetic field
    radii
    magnetic fields
    simulation
    energy
    temperature

    Keywords

    • Accretion, accretion disks
    • Convection
    • Hydrodynamics

    ASJC Scopus subject areas

    • Space and Planetary Science

    Cite this

    Quataert, E., & Gruzinov, A. (2000). Convection-dominated accretion flows. Astrophysical Journal, 539(2 PART 1), 809-814.

    Convection-dominated accretion flows. / Quataert, Eliot; Gruzinov, Andrei.

    In: Astrophysical Journal, Vol. 539, No. 2 PART 1, 20.08.2000, p. 809-814.

    Research output: Contribution to journalArticle

    Quataert, E & Gruzinov, A 2000, 'Convection-dominated accretion flows', Astrophysical Journal, vol. 539, no. 2 PART 1, pp. 809-814.
    Quataert E, Gruzinov A. Convection-dominated accretion flows. Astrophysical Journal. 2000 Aug 20;539(2 PART 1):809-814.
    Quataert, Eliot ; Gruzinov, Andrei. / Convection-dominated accretion flows. In: Astrophysical Journal. 2000 ; Vol. 539, No. 2 PART 1. pp. 809-814.
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