A magnetohydrodynamic theory of molecular tornadoes

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dc.contributor.authorAu, Kelvin
dc.contributor.examiningcommitteeLin, Francis (Physics and Astronomy) Hechter, Richard (Education)en_US
dc.contributor.supervisorFiege, Jason (Physics and Astronomy)en_US
dc.date.accessioned2017-09-08T18:18:43Z
dc.date.available2017-09-08T18:18:43Z
dc.date.issued2017-07-11en_US
dc.degree.disciplinePhysics and Astronomyen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractA theory of self-gravitating, pressure truncated, rotating molecular filaments with helical magnetic fields is developed to model molecular tornadoes recently observed in the Galactic Centre. A Monte Carlo exploration of the model parameter space is constrained by observations of three molecular tornadoes via three parameters involving observable quantities. It is found that torsional Alfvén wave physics is an important condition in realistic models. A virial analysis indicates that the magnetic field component dominates the pressure component, and both dominate self-gravity. “Phase diagrams” of numerical solutions to rotating, self-gravitating, unmagnetized cylinders are constructed to better understand solutions with “density inversions” found in the molecular tornado models. By varying free parameters of rotation and equation of state (EOS), five solution types are found and categorized. Self-truncating solutions with density inversions are found to occupy a larger portion of the solution space around the isothermal EOS.en_US
dc.description.noteOctober 2017en_US
dc.identifier.citationAu, K. & Fiege, J. D. (2017), `Magnetohydrodynamic Models of Molecular Tornadoes', The Astrophysical Journal 843, 107.en_US
dc.identifier.urihttp://hdl.handle.net/1993/32518
dc.language.isoengen_US
dc.publisherThe American Astronomical Societyen_US
dc.rightsopen accessen_US
dc.subjectPhysicsen_US
dc.subjectAstronomyen_US
dc.subjectAstrophysicsen_US
dc.subjectMagnetohydrodynamicsen_US
dc.subjectTheoryen_US
dc.subjectNumericalen_US
dc.subjectISMen_US
dc.subjectMolecular tornadoesen_US
dc.subjectMolecular cloudsen_US
dc.titleA magnetohydrodynamic theory of molecular tornadoesen_US
dc.typemaster thesisen_US
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