Thermal Stability in Two-Temperature Advection-Dominated Accretion, Disks against Local Perturbations
نویسندگان
چکیده
منابع مشابه
The Local Stability of Accretion Disks with Advection
Based on the disscusion of the applicability of local approximation, the local stability of accretion disks with advection is studied together with the considerations of radial viscous force and thermal diffusion. For a geometrically thin, radiative cooling dominated disk, the thermal diffusion has nearly no effects on the thermal and viscous modes, which are both stable if the disk is also opt...
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Advection-dominated accretion flows (ADAFs) have a positive Bernoulli parameter, and are therefore gravitationally unbound. The Newtonian ADAF model has been generalized recently to obtain the ADIOS model that includes outflows of energy and angular momentum, thereby allowing accretion to proceed self-consistently. However, the utilization of a Newtonian gravitational potential limits the abili...
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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 ∆θ > 2π/5, rather than slim as supposed previously in the literature.
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We investigate the form of the momentum distribution function for protons and electrons in an advection–dominated accretion flow (ADAF). We show that for all accretion rates, Coulomb collisions are too inefficient to thermalize the protons. The proton distribution function is therefore determined by the viscous heating mechanism, which is unknown. The electrons, however, can exchange energy qui...
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ژورنال
عنوان ژورنال: Publications of the Astronomical Society of Japan
سال: 1997
ISSN: 0004-6264,2053-051X
DOI: 10.1093/pasj/49.2.227