Low T/|W| dynamical instability in differentially rotating stars: Diagnosis with canonical angular momentum

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dc.creatorSaijo, Motoyuki
dc.creatorYoshida, Shin'ichirou
dc.date2005-05-26
dc.date2006-03-19
dc.date.accessioned2026-07-07T10:27:30Z
dc.date.available2026-07-07T10:27:30Z
dc.descriptionWe study the nature of non-axisymmetric dynamical instabilities in differentially rotating stars with both linear eigenmode analysis and hydrodynamic simulations in Newtonian gravity. We especially investigate the following three types of instability; the one-armed spiral instability, the low T/|W| bar instability, and the high T/|W| bar instability, where T is the rotational kinetic energy and W is the gravitational potential energy. The nature of the dynamical instabilities is clarified by using a canonical angular momentum as a diagnostic. We find that the one-armed spiral and the low T/|W| bar instabilities occur around the corotation radius, and they grow through the inflow of canonical angular momentum around the corotation radius. The result is a clear contrast to that of a classical dynamical bar instability in high T/|W|. We also discuss the feature of gravitational waves generated from these three types of instability.
dc.descriptionv1: 15 pages with 13 figures, mn2e.cls. Submitted to the Monthly Notices of the Royal Astronomical Society; v2: 16 pages with 17 figures, mn2e.cls. Monthly Notices of the Royal Astronomical Society (2006) in press
dc.identifierhttps://arxiv.org/abs/astro-ph/0505543
dc.identifierhttp://arxiv.org/abs/astro-ph/0505543
dc.identifierMon.Not.Roy.Astron.Soc.368:1429-1442,2006
dc.identifierdoi:10.1111/j.1365-2966.2006.10229.x
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/177166
dc.subjectAstrophysics
dc.subjectGeneral Relativity and Quantum Cosmology
dc.titleLow T/|W| dynamical instability in differentially rotating stars: Diagnosis with canonical angular momentum
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