New method for probing Kerr space-time based on imaging observation of in-falling gas blob

Publications of the Astronomical Society of Japan

Mineshige, Shin¹  Moriyama, Kotaro¹ 

[1] Department of Astronomy, Kyoto University, Kitashirakawa-oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan

关键词: accretion;    "black hole physics";    gravitation;    "radiative transfer";    "relativistic processes";   

DOI  :  10.1093/pasj/psw019

学科分类：天文学(综合)

来源: Oxford University Press

【 摘 要 】

Weproposeanewobservationalmethodtoprobetheblackholespace-timedescribedbyEinstein'stheory.Weconsideragasblobwithanarcshapefallingfromthemarginallystableorbitontoablackhole,carryingafiniteamountofangularmomentum.Previously,weproposedmeasuringtheblackholespinfromthefluxvariationdataofthein-fallingblob,assumingtheKerrspace-time.Wedemonstrateherethatwecanindependentlymeasuretheblackholespinsolelybyusingtheimagingdataofthein-fallingblob.WethenintroduceaKerr-likehole(withoneadditionalparameterwhichdescribesastrongerorweakerframe-draggingeffectthanthatoftheKerrhole)andapplythetwodifferentmethodsofspinmeasurement:onebasedonthefluxvariationdataandtheotherbasedontheimagingdata.WeobtaindifferentspinvaluesbythedifferentmethodsfortheKerr-likehole.Thisisbecausethesemethodsaresensitivetodifferentcomponentsofthemetric.Wecaninthiswayprobetheblackholespace-timethroughthecomparisonoftheestimatedspinvalues;thatis,iftheblackholespace-timeisdescribedbytheKerrmetric,allofthemshouldcoincide.

【 授权许可】

Unknown