New method for black-hole spin measurement based on flux variation from an infalling gas ring

Moriyama Kotaro; Mineshige Shin

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New method for black-hole spin measurement based on flux variation from an infalling gas ring

机译：基于落下气环通量变化的黑洞自旋测量新方法

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Weproposeanewmethodforblackholespinmeasurement.Inthismethod,weconsideragasbloborringfallingontoablackholefromthemarginallystableorbit,keepingitsinitialorbitalangularmomentum.WecalculatethegasmotionandphotontrajectoriesintheKerrspace-timeand,assumingthatthegasbloborringemitsmonochromaticradiation,carefullyexaminehowitisobservedbyadistantobserver.Thelightcurveoftheorbitinggasblobiscomposedofmanypeaksbecauseofperiodicenhancementofthefluxduetothegravitationallensingandbeamingeffects.Further,theintensityofeachpeakfirstgraduallyincreaseswithtimeduetothefocusingeffectaroundthephotoncircularorbitandthenrapidlydecreasesduetothegravitationalredshift,asthegasblobapproachestheeventhorizon.Thelightcurveofthegasringisequivalenttoasuperpositionofthoseoftheblobswithvariousinitialorbitalphases,andsoitiscontinuousandwithnopeaks.Thefluxfirstgraduallyincreasesandthenrapidlydecays,asintheblobmodel.Thefluxvariationtimescaledependsontheblackholespinandisindependentoftheinclinationangle,whiletime-averagedfrequencyshifthasdependenceonbotheffects.Wecanthus,inprinciple,determinespinandinclinationanglefromobservations.Theobservationalimplicationsandfutureissuesarebrieflydiscussed.

机译：Weproposeanewmethodforblackholespinmeasurement.Inthismethod，weconsideragasbloborringfallingontoablackholefromthemarginallystableorbit，保持Mac的e和我们有一个打点的有关RMO LCU的百夫长m.We思维之交SMO我们不得不ndpho承包商德国CTO里E不改变Kerrspace-timeand，assumingthatthegasbloborringemitsmonochromaticradiation，carefullyexaminehowitisobservedbyadistantobserver.Thelightcurveoftheorbitinggasblobiscomposedofmanypeaksbecauseofperiodicenhancementofthefluxduetothegravitationallensingandbeamingeffects.Further，theintensityofeachpeakfirstgraduallyincreaseswithtimeduetothefocusingeffectaroundthephotoncircularorbitandthenrapidlydecreasesduetothegravitationalredshift，asthegasblobapproachestheeventhorizon.Thelightcurveofthegasringisequivalenttoasuperpositionofthoseoftheblobswithvariousinitialorbitalphases，andsoitiscontinuousandwithnopeaks.Thefluxfirstgraduallyincreasesandthenrapidlydecays，改变的BLO BMO德l.The流感XVA RI US安提阿是SCA乐德PE ndso改变BLA ckho的SPI没有被处理的角度，然后fthe的ncli我们onangle，WHI letime-averagedfreq原则上，Wecanthus从观测中确定销钉和倾斜角度。简要讨论了观测的含义和未来的问题。

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《PASJ: Publications of the Astronomical Society of Japan》 |2015年第6期|共页
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Moriyama Kotaro; Mineshige Shin;
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New method for black-hole spin measurement based on flux variation from an infalling gas ring

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