Multi-Temperature Blackbody Spectra of Thin Accretion Disks With and Without a Zero-Torque Inner Boundary Condition

摘要: The standard spectral model for analyzing the soft component of thermal emission from a thin accretion disk around black hole is multi-temperature blackbody (MTB) model. widely used implementation this model, which known as ``diskbb,'' assumes nonzero torque at inner edge disk. This assumption contrary to classic and current literature on thin-disk accretion, advocates use zero-torque boundary condition. Consequently, we have written code ``ezdiskbb,'' compare nonzero-torque diskbb by fitting RXTE spectra three well-known binaries: 4U 1543-47, XTE J1550-564, GRO J1655-40. chief difference find that gives value radius about 2.2 times smaller than given diskbb. result has important implications, especially determination black-hole angular momentum mass rate.