Trapped, Two-Armed, Nearly Vertical Oscillations in Disks with Toroidal Magnetic Fields II: Effects of Finite Thickness

• Published in: arXiv.org
• Main Author: Kato, Shoji
• Format: Paper Journal Article
• Language: English
• Published: Ithaca Cornell University Library, arXiv.org 01.02.2012
• Subjects: Disks; Magnetic fields; Physics - High Energy Astrophysical Phenomena; Quasi-Periodic Oscillations; Vertical oscillations
• ISSN: 2331-8422
• DOI: 10.48550/arxiv.1202.0115

We examine radial trapping of two-armed (\(m=2\)) vertical p-mode oscillations in geometrically thin relativistic disks which are vertically isothermal but terminated at a certain height by the presence of hot and low-density corona. The disks are assumed to be subject to toroidal magnetic fields. The oscillations are classified by \(n\), a number related to the node number of oscillations in the vertical direction and starting from \(n=1\). In modes with \(n=1\), the frequencies of trapped oscillations depend little on the height of termination, but in modes with \(n=2,3,...\) the frequencies decrease and the radial extends of trapped region become wide, as the termination height decreases. This study is a preparation to examine whether these oscillations can describe kilo-hertz quasi-periodic oscillations (kHz QPOs), horizontal branch oscillation (HBOs), and their correlations.