A Test of MONDian Gravity in ∼300 Pressure-supported Elliptical Galaxies from the MaNGA Survey

Pressure-supported systems modeled under Modified Newtonian dynamics (MOND)ian extended gravity are expected to show an outer flattening in their velocity dispersion profiles. A characteristic scaling between the amplitude of the asymptotic velocity dispersion and the radius at which the flattening occurs is also expected. By comprehensively analyzing the dynamical behavior of ∼300 extremely low-rotating elliptical galaxies from the Mapping Nearby Galaxies at APO (MaNGA) survey, we show this type of pressure-supported system to be consistent with MONDian expectations, for a range of central velocity dispersion values of 60 km s^-1 < σ _central < 280 km s^-1 and asymptotic velocity dispersion values of 28 {km} {{{s}}}^-1< {σ }_∞ < 250 {km} {{{s}}}^-1. We find that a universal velocity dispersion profile accurately describes the studied systems; the predicted kinematics of extended gravity are verified for all well-observed galaxies.