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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Steady Models of Optically Thin, Magnetically Supported Black Hole Accretion Disks
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Steady Models of Optically Thin, Magnetically Supported Black Hole Accretion Disks

机译：光学薄的磁性支撑黑洞吸积盘的稳态模型

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Weobtainedsteadysolutionsofopticallythin,single-temperature,magnetizedblackholeaccretiondisks,assumingthermalbremsstrahlungcooling.Basedontheresultsof3DMHDsimulationsofaccretiondisks,weassumedthatthemagneticfieldsinsidethediskareturbulentanddominatedbyanazimuthalcomponent.Wedecomposedthemagneticfieldsintoanazimuthallyaveragedmeanfieldandfluctuatingfields.WealsoassumedthattheazimuthallyaveragedMaxwellstressisproportionaltothetotalpressure.Theradialadvectionrateoftheazimuthalmagneticflux,$$dotPhi$$,isprescribedasbeingproportionalto$$varpi^{-zeta}$$,where$$varpi$$istheradialcoordinateand$$zeta$$isaparameterthatparameterizestheradialvariationof$$dotPhi$$.Wefoundthatwhentheaccretionrate,$$dotM$$,exceedsthethresholdfortheonsetofthethermalinstability,amagneticpressure-dominatednewbranchappears.Thus,thethermal-equilibriumcurveofanopticallythindiskhasaa€?Za€?-shapeintheplaneofthesurfacedensityandtemperature.Thisindicatesthatasthemassaccretionrateincreases,agaspressure-dominatedopticallythinhotaccretiondiskundergoesatransitiontoamagneticpressuredominated,opticallythincooldisk.ThisdiskcorrespondstotheX-rayhard,luminousdiskinblackholecandidatesobservedduringthetransitionfromalow/hardstatetoahigh/softstate.Wealsoobtainedglobalsteadytransonicsolutionscontainingsuchatransitionlayer.
机译：Weobtainedsteadysolutionsofopticallythin，单温度，magnetizedblackholeaccretiondisks，assumingthermalbremsstrahlungcooling.Basedontheresultsof3DMHDsimulationsofaccretiondisks，weassumedthatthemagneticfieldsinsidethediskareturbulentanddominatedbyanazimuthalcomponent.Wedecomposedthemagneticfieldsintoanazimuthallyaveragedmeanfieldandfluctuatingfields.WealsoassumedthattheazimuthallyaveragedMaxwellstressisproportionaltothetotalpressure.Theradialadvectionrateoftheazimuthalmagneticflux，$$ dotPhi $$，isprescribedasbeingproportionalto $$ varpi ^ { - ζ电} $$，其中$$ varpi $$ istheradialcoordinateand $$ζ电$$我们发现，当$$ dotM $$的增生率超过热不稳定性设定的阈值时，一个以电磁压力为主的新分支出现。因此，平面上的温度相等且热度大致等于该平面上的一个热值，这表明该平面的大小是多少？ ccretion磁盘经历了转变为以电磁为主的，光学上较薄的磁盘。该磁盘与X射线硬，发光的黑洞磁盘候选对象在从低/硬状态到高/软状态的过渡期间均得到观察。我们还获得了包含此类过渡层的全球稳定跨音速解决方案。

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