Do Magnetic Fields Destroy Black Hole Accretion Disk g-Modes?
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| Autoři: | , , , , |
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| Médium: | artículo original |
| Datum vydání: | 2015 |
| Popis: | Diskoseismology, the theoretical study of normal-mode oscillations in geometrically thin, optically thick accretion disks, is a strong candidate for explaining some quasi-periodic oscillations in the power spectra of many black hole X-ray binary systems. The existence of g-modes, presumably the most robust and visible of the modes, depends on general relativistic gravitational trapping in the hottest part of the disk. As the existence of the required cavity in the presence of magnetic fields has been put into doubt by theoretical calculations, we will explore in greater generality what effect the inclusion of magnetic fields has on the existence of g-modes. We use an analytical perturbative approach on the equations of MHD to assess the impact of such effects. Our main conclusion is that there appears to be no compelling reason to discard g-modes. In particular, the inclusion of a non-zero radial component of the magnetic field enables a broader scenario for cavity non-destruction, especially taking into account recent simulations' saturation values for the magnetic field. |
| Země: | Kérwá |
| Instituce: | Universidad de Costa Rica |
| Repositorio: | Kérwá |
| OAI Identifier: | oai:kerwa.ucr.ac.cr:10669/77421 |
| On-line přístup: | https://iopscience.iop.org/article/10.1088/0004-637X/809/1/15/meta https://hdl.handle.net/10669/77421 |
| Access Level: | acceso abierto |
| Klíčové slovo: | Accretion Accretion disks Black hole physics Hydrodynamics Magnetic fields Magnetohydrodynamics (MHD) X-rays: binaries 538.72 Campos magnéticos de la tierra sólida |