| Issue |
A&A
Volume 674, June 2023
|
|
|---|---|---|
| Article Number | A168 | |
| Number of page(s) | 5 | |
| Section | Astrophysical processes | |
| DOI | https://doi.org/10.1051/0004-6361/202245171 | |
| Published online | 19 June 2023 | |
A discontinuity at the base of the transition layer located between the Keplerian accretion disk and the compact object
1
Dipartimento di Fisica, Università di Ferrara, Via Saragat 1, 44122 Ferrara, Italy
e-mail: titarchuk@fe.infn.it
2
Keldysh Institute of Applied Mathematics, Russian Academy of Sciences, 4 Miusskaya sq., Moscow, 125047
Russia
e-mail: kalasxel@gmail.com
Received:
8
October
2022
Accepted:
15
May
2023
Context. We study the geometry of the transition layer (TL) between the classical Keplerian accretion disk (the TL outer boundary) and the compact object at the TL inner boundary.
Aims. Our goal is to use the hydrodynamical formalism to demonstrate that the TL is created, together with a shock, in response to a discontinuity and to adjust the Keplerian disk motion to a central object (CO).
Methods. We apply hydrodynamical equations to describe a plasma motion near a CO in the TL.
Results. We point out that, before matter accretes to a CO, the TL cloud is formed between an adjustment radius and the TL inner boundary, which is probably a site where the emergent Compton spectrum originates. Using a generalization of the Randkine–Hugoniot relation and a solution of the azimutal force balance equation, we are able to reproduce the geometric characteristics of the TL.
Key words: accretion, accretion disks / radiation mechanisms: general / black hole physics / stars: neutron / white dwarfs
© The Authors 2023
Open Access article, published by EDP Sciences, under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
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