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Accretion Flows in Astrophysics pp 201–258Cite as

Structure of Accretion Discs in Lensed QSOs

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

Abstract

As early as in 1937, Zwicky wrote about gravitational lenses acting as ‘space telescopes’, allowing the observation of faint and distant objects, the fluxes from which may be considerably enhanced due to the lensing. It is clear today that gravitational lensing may be helpful in performing another important task, one of the main purposes of telescopic observations, namely, increasing spatial resolution. The images of strongly lensed QSOs are affected by microlensing effects in the halo of the lensing galaxy. In contrast to the classical strong lensing, these effects are sensitive to the size and form of an object. The purpose of this chapter is to give a general introduction to quasar microlensing and to illustrate the capabilities of the method, with a review of the latest results in this field, concentrating especially on the results obtained in our three recent papers.

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Notes

  1. 1.

    For a fold caustic considered below, the amplification decreases inversely proportional to the distance to the caustic in the image plane, μ ∝ Δθ −1, or μ ∝ Δβ −1∕2 (see later this section). The integral of this expression over a restricted solid angle converges. For a more complex singularity (for example, a cusp), the finiteness of amplification follows from the asymptotic behaviour of amplification which decreases inversely proportional to the distance to this singularity (a point), or slower (Gaudi and Petters 2002).

  2. 2.

    The photospheric size is proportional to \(R_1 \propto \varkappa \dot {M}\), while the product \(M\dot {M} \propto F_\nu ^{3/2}\) does not depend on opacity; the Thomson opacity ϰT, which is included in the Eddington luminosity normalization, is considered fixed.

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Authors and Affiliations

  1. Sternberg Astronomical Institute, Lomonosov Moscow State University, Moscow, Russia

    Pavel Abolmasov, Nikolay Shakura & Anna Chashkina

  2. Tuorla Observatory, University of Turku, Piikkio, Finland

    Pavel Abolmasov & Anna Chashkina

  3. Kazan Federal University, Kazan, Russia

    Nikolay Shakura

Authors
  1. Pavel Abolmasov
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  2. Nikolay Shakura
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  3. Anna Chashkina
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Editors and Affiliations

  1. Relativistic Astrophysics Department, Sternberg Astronomical Institute, Moscow, Russia

    Nikolay Shakura

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Abolmasov, P., Shakura, N., Chashkina, A. (2018). Structure of Accretion Discs in Lensed QSOs. 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_5

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