2021/02/28 by Aseem Paranjape, Ravi K. Sheth
Physics and Astronomy · #Acceleration #Astrophysics #Baryon #Cold dark matter #Cosmology and Gravitation Theories #Dark matter #Galaxies: Formation, Evolution, Phenomena #Galaxy #Halo #Particle physics #Physics #Quantum mechanics #Radio Astronomy Observations and Technology #Redshift #astro-ph.CO #astro-ph.GA
paper · pdf · doi:10.1093/mnras/stab2141
20 pages, 16 figures; v2 - added discussion, clarifications and references, conclusions unchanged, accepted in MNRAS
openalex created_date 2021/03/15 · openalex publication_date 2021/07/22 · arxiv created 2021/07/23 · arxiv updated 2021/08/04 · openalex updated_date 2026/08/05
ABSTRACT We study the radial acceleration relation (RAR) between the total (atot) and baryonic (abary) centripetal acceleration profiles of central galaxies in the cold dark matter (CDM) paradigm. We analytically show that the RAR is intimately connected with the physics of the quasi-adiabatic relaxation of dark matter in the presence of baryons in deep potential wells. This cleanly demonstrates how the mean RAR and its scatter emerge in the low-acceleration regime (10-12\rm m s-2\lesssim a\rm bary\lesssim 10-10\rm m s-2) from an interplay between baryonic feedback processes and the distribution of CDM in dark haloes. Our framework allows us to go further and study both higher and lower accelerations in detail, using analytical approximations and a realistic mock catalogue of ∼342 000 low-redshift central galaxies with Mr ≤ −19. We show that, while the RAR in the baryon-dominated high-acceleration regime (a\rm bary\gtrsim 10-10\rm m s-2) is very sensitive to details of the relaxation physics, a simple ‘baryonification’ prescription matching the relaxation results of hydrodynamical CDM simulations is remarkably successful in reproducing the observed RAR without any tuning. And in the (currently unobserved) ultra-low-acceleration regime (a\rm bary\lesssim 10-12\rm m s-2), the RAR is sensitive to the abundance of diffuse gas in the halo outskirts, with our default model predicting a distinctive break from a simple power-law-like relation for H i-deficient, diffuse gas-rich centrals. Our mocks also show that the RAR provides more robust, testable predictions of the ΛCDM paradigm at galactic scales, with implications for alternative gravity theories than the baryonic Tully–Fisher relation.