Distinguishing Modified Newtonian Dynamics from dark matter with galaxy-galaxy lensing measurements

dc.contributor.authorTian, Lanlan
dc.contributor.supervisorHoekstra, Henk
dc.date.accessioned2008-07-30T19:50:47Z
dc.date.available2008-07-30T19:50:47Z
dc.date.copyright2008en_US
dc.date.issued2008-07-30T19:50:47Z
dc.degree.departmentDept. of Physics and Astronomyen_US
dc.degree.levelMaster of Science M.Sc.en_US
dc.description.abstractAs an alternative to dark matter, Modified Newtonian Dynamics (MOND) can explain dynamical measurements of galaxies on small scales. It is, however, unclear whether MOND still works for galaxies on the large scale. In this study, we use galaxy- galaxy (g-g) weak lensing measurements to examine MOND in the outer regions of galaxies. First, we study the amplitude of the weak gravitational lensing signal as a function of stellar mass around relatively isolated galaxies. We find that our measurements are inconsistent with the predictions from MOND. Second, we examine whether MOND can produce an anisotropic lensing signal as observed in the real data. Starting with a mass distribution of an extremely high ellipticity, we find it is very hard for MOND to reproduce the observed extensive anisotropic lensing signal from only the visible mass. Because the g-g lensing is measured at radii of up to hundreds of kiloparsecs, these two tests indicate that MOND does not work in outer regions of galaxies. Our study casts serious doubt on the notation that MOND can convincingly prove itself as a viable alternative to dark matter.en_US
dc.identifier.urihttp://hdl.handle.net/1828/1036
dc.languageEnglisheng
dc.language.isoenen_US
dc.rightsAvailable to the World Wide Weben_US
dc.subjectDark Matteren_US
dc.subjectMONDen_US
dc.subjectgalaxy-galaxy lensingen_US
dc.subject.lcshUVic Subject Index::Sciences and Engineering::Physics::Astronomyen_US
dc.titleDistinguishing Modified Newtonian Dynamics from dark matter with galaxy-galaxy lensing measurementsen_US
dc.typeThesisen_US

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