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arXiv · 2310.15248

Radial acceleration relation of galaxies with joint kinematic and weak-lensing data

Tobias Mistele·Stacy McGaugh·Federico Lelli·James Schombert·Pengfei Li
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Abstract

We combine kinematic and gravitational lensing data to construct the Radial Acceleration Relation (RAR) of galaxies over a large dynamic range. We improve on previous weak-lensing studies in two ways. First, we compute stellar masses using the same stellar population model as for the kinematic data. Second, we introduce a new method for converting excess surface density profiles to radial accelerations. This method is based on a new deprojection formula which is exact, computationally efficient, and gives smaller systematic uncertainties than previous methods. We find that the RAR inferred from weak-lensing data smoothly continues that inferred from kinematic data by about $2.5\,\mathrm{dex}$ in acceleration. Contrary to previous studies, we find that early- and late-type galaxies lie on the same joint RAR when a sufficiently strict isolation criterion is adopted and their stellar and gas masses are estimated consistently with the kinematic RAR.

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Tobias Mistele, Stacy McGaugh, Federico Lelli, James Schombert, Pengfei Li. 2023-10-23. Radial acceleration relation of galaxies with joint kinematic and weak-lensing data. https://doi.org/10.1088/1475-7516%2F2024%2F04%2F020

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