= Shakura--Sunyaev thin disk
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The \b[Shakura--Sunyaev thin disk] combines a <thin disk>, large <optical depth>, efficient local <radiative cooling> and an <alpha disk> stress prescription. At each radius, orbital-energy dissipation is balanced by radiation escaping vertically. The model predicts a radial sequence of effective temperatures and therefore a broad spectrum. It is useful when vertical adjustment and cooling are faster than radial evolution; strong inward heat transport, winds or large thickness require a different approximation.<Dynamics of Astrophysical Discs by Gordon I. Ogilvie>[Lecture8, section8.1: vertical energy transport and neglected radial terms]{ref}
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