Analytic Model for Advection‐dominated Accretion Flows in a Global Magnetic Field | Zendy

Osamu Kaburaki | Zendy

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Analytic Model for Advection‐dominated Accretion Flows in a Global Magnetic Field

Author(s) -

Osamu Kaburaki

Publication year - 2000

Publication title -

the astrophysical journal

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 2.376

H-Index - 489

eISSN - 1538-4357

pISSN - 0004-637X

DOI - 10.1086/308442

Subject(s) - advection , accretion (finance) , physics , magnetic field , angular momentum , mechanics , flow (mathematics) , dissipation , classical mechanics , astrophysics , thermodynamics , quantum mechanics

A model for advection-dominated accretion flows (ADAFs) in a global magneticfield is proposed. In contrast to the well known ADAF models in which theviscosity of a fluid determines both angular momentum transfer and energydissipation in the flow, the magnetic field and the electric resistivity,respectively, control them in this model. A manageable set of analyticsolutions for the flow and the magnetic field is obtained to verticallynon-integrated basic equations. This set describes mathematically a fullyadvective accretion flow and, in physically plausible situations for most AGNs,it is also confirmed that the radiation cooling estimated on this solution isreally negligible compared with the internal energy of the flow.Comment: 27pages, 1 figure, to appear in ApJ vol 529, Feb.1, 200

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