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The Standard Model of Disc Accretion

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Part of the book series: Astrophysics and Space Science Library ((ASSL,volume 454))

Abstract

Accretion discs are powerful energy factories in our Universe. They effectively transform the potential energy of gravitational interaction to emission, thereby unraveling the physics of distant objects. This is possible due to the presence of viscosity, driven by turbulent motions in accretion discs. In this chapter, we describe the equations for disc accretion in the framework of the standard model. We outline basic elements of the theory of turbulent viscosity and the emergence of the α-parameter. We further describe the radial and vertical structure of thin stationary accretion discs, and present analytical solutions to the basic equation of the evolution of a viscous accretion disc for both an infinite disc and for a disc in a binary system. Finally, we present a numerical method to solve the equations of disc evolution and vertical structure simultaneously.

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Notes

  1. 1.

    With this definition, \(w_{r\varphi }^{\mathrm {t}} \) will be positive in accretion discs. In other literature on the subject, the definition \(t_{r\varphi }=-w_{r\varphi }^{\mathrm {t}}\) is often used instead.

  2. 2.

    They are analogous to the quantities \(v_x^{\prime }\) and \(\xi _z^{\prime }\) discussed in Sect. 1.3.4.

  3. 3.

    In the original paper by Ketsaris and Shakura (1998), the parameter Σ 0 was defined as half the total surface density of the disc. Due to this, there is a difference in the numerical coefficients in some of the formulas given below compared to the formulas in Ketsaris and Shakura (1998).

  4. 4.

    This property is similar to the one that arises in problems of thermal conductivity, when, due to the non-linearity, the heatwave boundary sharply separates the heated zone from the rest of the region (Zeldovich and Raizer 1967).

  5. 5.

    Note that here F is a factor of 2π larger than in the paper by Lyubarskij and Shakura (1987), and our quantity D is smaller by a factor of (2 π)m.

  6. 6.

    http://xray.sai.msu.ru/~malanchev/freddi/.

  7. 7.

    http://xray.sai.msu.ru/~malanchev/freddi/.

  8. 8.

    Fast-rise exponential-decay.

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Correspondence to Galina Lipunova .

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Lipunova, G., Malanchev, K., Shakura, N. (2018). The Standard Model of Disc Accretion. In: Shakura, N. (eds) Accretion Flows in Astrophysics . Astrophysics and Space Science Library, vol 454. Springer, Cham. https://doi.org/10.1007/978-3-319-93009-1_1

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