A Test of MONDian Gravity in $\sim$300 pressure supported elliptical galaxies from the MaNGA survey

TL;DR

This study tests MONDian gravity predictions using velocity dispersion profiles of about 300 pressure-supported elliptical galaxies from the MaNGA survey, finding consistency with theoretical expectations across a range of galaxy properties.

Contribution

It provides the first comprehensive analysis confirming MONDian gravity predictions in pressure-supported elliptical galaxies using a large, diverse sample.

Findings

Velocity dispersion profiles show outer flattening consistent with MOND.

A universal velocity dispersion profile fits all studied galaxies.

Predicted kinematics of extended gravity are verified across the sample.

Abstract

Pressure supported systems modeled under MONDian 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 $\sim$300 extremely low rotating elliptical galaxies from the MaNGA survey, we show this type of pressure supported systems to be consistent with MONDian expectations, for a range of central velocity dispersion values of $60 km/s < \sigma_{central}< 280 km/s $ and asymptotic velocity dispersion values of $28km/s < \sigma_{\infty}<250 km/s$. 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.