Radiatively Inefficient Accretion Disks
نویسنده
چکیده
Radiatively inefficient (or advection dominated) disks are discussed at an introductory level. Ion supported and radiation supported flows are discussed, the different consequences of advection dominated flows onto black holes vs. solid surfaces (neutron stars, white dwarfs), hydrodynamics, the role of the ratio of specific heats, and the possible connection between ADAFs and outflows.
منابع مشابه
On the Radial Structure of Radiatively Inefficient Accretion Flows with Convection
We consider the radial structure of radiatively inefficient hydrodynamic accretion flows around black holes. We show that low-viscosity flows consist of two zones: an outer convection-dominated zone and an inner advection-dominated zone. The transition between these two zones occurs at ∼ 50 Schwarzschild radii. Subject headings: accretion, accretion disks — black hole physics — convection Depar...
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Black holes are most often detected by the radiation produced when they gravitationally pull in surrounding gas, in a process called accretion. The efficiency with which the hot gas radiates its thermal energy strongly influences the geometry and dynamics of the accretion flow. Both radiatively efficient thin disks and radiatively inefficient thick disks are observed. When the accreting gas get...
متن کاملWhere to Look for Radiatively Inefficient Accretion Flows (and Find Them)
We have studied the nuclear emission detected in high-resolution radio and optical data of carefully selected samples of low luminosity AGN (LLAGN) in the local universe. When the Eddington ratio is plotted against the nuclear “radio-loudness” parameter, sources divide according to their physical properties. It is thus possible to disentangle between nuclear jets and accretion disks of differen...
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The radiative efficiencies of accretion flows become significantly lower than that of standard thin disks, if they are accreting at rates lower than a critical accretion rate ṁcrit. The transition of a standard thin disk to a radiatively inefficient accretion flow (RIAF) is expected to occur, while ṁ ∼ ṁcrit (ṁ = Ṁ/ṀEdd). We simulate the distributions of Eddington ratio λL B λ/LEdd for active g...
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The transition of a standard thin disk to a radiatively inefficient accretion flow (RIAF) is expected to occur, when ṁ ∼ ṁcrit (ṁ = Ṁ/ṀEdd). The radiative efficiencies of accretion flows accreting at rates lower than the critical accretion rate ṁcrit become significantly lower than that of standard thin disks. It is believed that the initial transition radius is small just after the accretion m...
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تاریخ انتشار 2000