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

Name: The empirical laws of galaxy dynamics: from gas kinematics to weak lensing
Keywords: Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics - Astrophysics of Galaxies, General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics

descriptionPublicationkeyboard_double_arrow_right Article , Preprint 01 Jan 2024Embargo end date: 01 Jan 2024Publisher:arXiv

Authors: Lelli, Federico; Mistele, Tobias; McGaugh, Stacy S.; Schombert, James M.; Li, Pengfei;

doi: 10.48550/arxiv.2411.02499

arXiv: http://arxiv.org/abs/2411.02499

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

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Abstract

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.

Invited review for the IAU General Assembly 2024, Focus Meeting 9 (6 pages, 3 figures)

Related Organizations

Case Western Reserve University
United States
Arcetri Astrophysical Observatory
Italy
National Institute for Astrophysics
Italy
Nanjing University
China (People's Republic of)
University of Oregon
United States

Keywords

Cosmology and Nongalactic Astrophysics (astro-ph.CO), Astrophysics of Galaxies (astro-ph.GA), FOS: Physical sciences, General Relativity and Quantum Cosmology (gr-qc), Astrophysics - Astrophysics of Galaxies, General Relativity and Quantum Cosmology, Astrophysics - Cosmology and Nongalactic Astrophysics

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