Arcy Layne Sace (Graduate Institute of Astronomy, National Central University, Taoyuan, Taiwan) ; Chung-Ming Ko (Graduate Institute of Astronomy, National Central University, Taoyuan, Taiwan. Department of Physics and Center of Complex Systems, National Central University, Taoyuan, Taiwan)
Radial Acceleration Relation (RAR) is a relation between the baryonic, and total acceleration of a galaxy. RAR are typically measured on spiral galaxies in literature, so fewer studies have focused on elliptical galaxies. In this work, data of elliptical galaxies were selected from SDSS DR15. Each of their total accelerations were deduced from their measured velocity dispersion. Since elliptical galaxies are pressure-supported systems, the deduced acceleration depends on the model used. Hernquist model is used for both dark matter halo, and in Modified Newtonian Dynamics (MOND). Finally, the RAR of the samples were obtained at their effective radius, and the results from different models are compared.