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

Ludlow, AD and Benitez-Llambay, A and Schaller, M and Theuns, T and Frenk, CS and Bower, R and Schaye, J and Crain, RA and Navarro, JF and 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

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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
Additional Information: 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
Uncontrolled Keywords: astro-ph.GA; astro-ph.GA; astro-ph.CO
Subjects: Q Science > QB Astronomy
Q Science > QC Physics
Divisions: Astrophysics Research Institute
Publisher: American Physical Society
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Date Deposited: 03 May 2017 10:32
Last Modified: 12 Sep 2017 06:13
DOI or Identification number: 10.1103/PhysRevLett.118.161103
URI: http://researchonline.ljmu.ac.uk/id/eprint/6344

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