Analytic study on high spin BH Consider the case the the central object is a maximally spinning Kerr black hole. Type I IMRAC:IMBH is a near-extreme BH Type II IMRAC:the central object is a Gargantua Gargantua:the supermassive BH which is nearly maximal spinning K.Thore "interstellar" X-ray observations:7 out of 22 AGNs are candidates for being high spin BH Brenneman 1300.6334 4口◆4回t1三1声，￥QC . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Analytic study on high spin BH Consider the case the the central object is a maximally spinning Kerr black hole. Type I IMRAC: IMBH is a near-extreme BH Type II IMRAC: the central object is a Gargantua Gargantua: the supermassive BH which is nearly maximal spinning K. Thorne ”Interstellar” X-ray observations: 7 out of 22 AGNs are candidates for being high spin BH Brenneman 1309.6334 Why a near extreme Kerr BH special? Enhanced scaling symmetry in the near horizon region