Observational Constraints on the Modified Gravity Model (MOG) Proposed by Moffat: Using the Magellanic System |
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Authors: | Hosein Haghi and Sohrab Rahvar |
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Institution: | 1.Institute for Advanced Studies in Basic Sciences (IASBS),Zanjan,Iran;2.School of Astronomy,IPM (Institute for Studies in Theoretical Physics and Mathematics),Tehran,Iran |
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Abstract: | A simple model for the dynamics of the Magellanic Stream (MS), in the framework of modified gravity models is investigated.
We assume that the galaxy is made up of baryonic matter out of context of dark matter scenario. The model we used here is
named Modified Gravity (MOG) proposed by Moffat (J. Cosmol. Astropart. Phys. 003, 2005). In order to examine the compatibility of the overall properties of the MS under the MOG theory, the observational radial
velocity profile of the MS is compared with the numerical results using the χ
2 fit method. In order to obtain the best model parameters, a maximum likelihood analysis is performed. We also compare the
results of this model with the Cold Dark Matter (CDM) halo model and the other alternative gravity model that proposed by
Bekenstein (Phys. Rev. D 70:083509, 2004), so called TeVeS. We show that by selecting the appropriate values for the free parameters, the MOG theory seems to be plausible
to explain the dynamics of the MS as well as the CDM and the TeVeS models. |
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