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The empirical laws of galaxy dynamics: from gas kinematics to weak lensing

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arxiv 2411.02499 v1 pith:IFI5WUBE submitted 2024-11-04 astro-ph.GA astro-ph.COgr-qc

Federico Lelli (1) , Tobias Mistele (2) , Stacy S. McGaugh (2) , James M. Schombert (3) , Pengfei Li (4) ((1) INAF - Arcetri Astrophysical Observatory , (2) Case Western Reserve University , (3) University of Oregon , (4) Nanjing University) This is my paper · ORCID
classification astro-ph.GAastro-ph.COgr-qc
keywords etgslawsltgsdynamicsempiricalgalaxiesgalaxyacceleration
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Galaxies obey a set of strict dynamical laws, which imply a close coupling between the visible matter (stars and gas) and the observed dynamics (set by dark matter in the standard cosmological context). Here we review recent results from weak gravitational lensing, which allows studying the empirical laws of galaxy dynamics out to exceedingly large radii in both late-type galaxies (LTGs) and early-type galaxies (ETGs). We focus on three laws: (1) the circular velocity curves of both LTGs and ETGs remain indefinitely flat out to several hundreds of kpc; (2) the same baryonic Tully-Fisher relation is followed by LTGs and ETGs; (3) the same radial acceleration relation (RAR) is followed by LTGs and ETGs. Combining galaxy data with Solar System data, the RAR covers about 16 orders of magnitude in the Newtonian baryonic acceleration. Remarkably, these empirical facts were predicted a priori by MOND.

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  1. Mass models of galaxy clusters from a non-parametric weak-lensing reconstruction

    astro-ph.CO 2025-06 conditional novelty 6.0 of 10

    Non-parametric weak-lensing mass profiles of CLASH clusters imply nearly flat circular velocities, while cluster offsets from galaxy scaling relations hinge on uncertain gas extrapolations.

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