Modeling submillimetre polarization of molecular cloud cores using successive parametrized coordinate transformations

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dc.contributor.authorFranzmann, Erica
dc.contributor.examiningcommitteeEnglish, Jayanne (Physics and Astronomy) Mojabi, Puyan (Electrical and Computer Engineering)en_US
dc.contributor.supervisorFiege, Jason (Physics and Astronomy)en_US
dc.date.accessioned2014-08-20T15:44:07Z
dc.date.available2014-08-20T15:44:07Z
dc.date.issued2014-08-20
dc.degree.disciplinePhysics and Astronomyen_US
dc.degree.levelMaster of Science (M.Sc.)en_US
dc.description.abstractWe present a novel new method for modelling magnetized molecular cloud cores using submillimetre linear polarization maps from thermal dust emission. Our PolCat modelling software builds a three-dimensional core model via the use of consecutive parametrized coordinate transformations, and produces simulated polarization maps to fit to observational datasets. We utilize the Ferret evolutionary optimizer to search the parameter space to simultaneously minimize chi-squared for the intensity and polarization position angle maps separately. We have applied PolCat to multiple test problems and several datasets from the SCUPOL Legacy Catalogue. We find that PolCat is able to distinguish between maps of twisted and non-twisted field geometries and identify twist symmetry. Preliminary fits to several datasets show that the best potential field geometries to our sample cores contain field twists. Further research using a larger number of maps is required to determine if twisted fields are commonplace in cores.en_US
dc.description.noteOctober 2014en_US
dc.identifier.urihttp://hdl.handle.net/1993/23830
dc.language.isoengen_US
dc.rightsopen accessen_US
dc.subjectastrophysicsen_US
dc.subjectmolecular cloudsen_US
dc.subjectmodellingen_US
dc.subjectISMen_US
dc.subjectISM: cloudsen_US
dc.subjectmagnetic fieldsen_US
dc.subjectsubmillimetre polarizationen_US
dc.subjectMHDen_US
dc.subjectmagnetohydrodynamicsen_US
dc.subjectstar formationen_US
dc.titleModeling submillimetre polarization of molecular cloud cores using successive parametrized coordinate transformationsen_US
dc.typemaster thesisen_US
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