The Shakura-Sunyaev Disk Can Smoothly Match an Advection-dominated Accretion Flow | Zendy

JuFu Lu | Zendy; Yi-Qing Lin | Zendy; WeiMin Gu | Zendy

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The Shakura-Sunyaev Disk Can Smoothly Match an Advection-dominated Accretion Flow

Author(s) -

JuFu Lu,

Yi-Qing Lin,

WeiMin Gu

Publication year - 2004

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 - 10.1086/382209

Subject(s) - advection , physics , accretion (finance) , thermal conduction , radius , thermal , intermediate polar , mechanics , radiative transfer , boundary value problem , black hole (networking) , plasma , radiative cooling , astrophysics , thermodynamics , white dwarf , optics , nuclear physics , quantum mechanics , computer network , stars , routing protocol , routing (electronic design automation) , computer security , link state routing protocol , computer science

We use the standard Runge-Kutta method to solve the set of basic equationsdescribing black hole accretion flows composed of two-temperature plasma. We donot invoke any extra energy transport mechanism such as thermal conduction anddo not specify any ad hoc outer boundary condition for the advection-dominatedaccretion flow (ADAF) solution. We find that in the case of high viscosity andnon-zero radiative cooling, the ADAF solution can have an asymptotic approachto the Shakura-Sunyaev disk (SSD) solution, and the SSD-ADAF transition radiusis close to the central black hole. Our results further prove the mechanism ofthermal instability-triggered SSD-ADAF transition suggested previously byTakeuchi & Mineshige and Gu & Lu.Comment: 10 pages, 2 figures, accepted for publication in ApJ Letter

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