# The Mass-Discrepancy Acceleration Relation: a Natural Outcome of Galaxy Formation in Cold Dark Matter halos

Ludlow, AD, Benitez-Llambay, A, Schaller, M, Theuns, T, Frenk, CS, Bower, R, Schaye, J, Crain, RA, Navarro, JF, Fattahi, A and Oman, KA (2017) The Mass-Discrepancy Acceleration Relation: a Natural Outcome of Galaxy Formation in Cold Dark Matter halos. Physical Review Letters, 118. ISSN 1079-7114

 Text PhysRevLett.118.161103.pdf - Published Version Download (681kB)

## Abstract

We analyze the total and baryonic acceleration profiles of a set of well-resolved galaxies identified in the EAGLE suite of hydrodynamic simulations. Our runs start from the same initial conditions but adopt different prescriptions for unresolved stellar and AGN feedback, resulting in diverse populations of galaxies by the present day. Some of them reproduce observed galaxy scaling relations, while others do not. However, regardless of the feedback implementation, all of our galaxies follow closely a simple relationship between the total and baryonic acceleration profiles, consistent with recent observations of rotationally supported galaxies. The relation has small scatter: different feedback implementations -- which produce different galaxy populations -- mainly shift galaxies along the relation, rather than perpendicular to it. Furthermore, galaxies exhibit a characteristic acceleration, $g_{\dagger}$, above which baryons dominate the mass budget, as observed. These observations, consistent with simple modified Newtonian dynamics, can be accommodated within the standard cold dark matter paradigm.

Item Type: Article This is the accepted version of the following article: Aaron D. Ludlow, Alejandro Benítez-Llambay, Matthieu Schaller, Tom Theuns, Carlos S. Frenk, Richard Bower, Joop Schaye, Robert A. Crain, Julio F. Navarro, Azadeh Fattahi, and Kyle A. Oman Phys. Rev. Lett. 118, 161103, which has been published in final form at http://dx.doi.org/10.1103/PhysRevLett.118.161103 astro-ph.GA; astro-ph.GA; astro-ph.CO Q Science > QB AstronomyQ Science > QC Physics Astrophysics Research Institute American Physical Society Author 03 May 2017 10:32 02 Mar 2022 09:52 10.1103/PhysRevLett.118.161103 https://researchonline.ljmu.ac.uk/id/eprint/6344

### Actions (login required)

 View Item