Abstract
Abstract We examine the expected spectra of black hole accretion flows, which are assumed to be steady and spherically symmetric, considering the separation of the apparent photosphere and thermalization surface under electron scattering. Although the flow itself is spherical, the apparent shape of the photosphere is not spherical, since the density distribution gradually decreases with radius. Furthermore, due to electron scattering, the thermalization surface decouples with the photosphere, and is located deep inside the photosphere for scattering-dominated flows. Since the shape of the thermalization surface is also aspherical, the temperature there is not uniform, which causes a strong limb-darkening effect, and we may observe a non-blackbody spectrum with multi-color-type.
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