Advection-Dominated Accretion Disks: Geometrically Slim or Thick?

preprint2009arXivOpen access

Abstract

We revisit the vertical structure of black hole accretion disks in spherical coordinates. By comparing the advective cooling with the viscous heating, we show that advection-dominated disks are geometrically thick, i.e., with the half-opening angle > 2π/5, rather than slim as supposed previously in the literature.

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