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Mass-Discrepancy Acceleration Relation: A Natural Outcome of Galaxy Formation in Cold Dark Matter Halos

Ludlow, A.D.; Benítez-Llambay, A.; Schaller, M.; Theuns, T.; Frenk, C.S.; Bower, R.; Schaye, J.; Crain, R.A.; Navarro, J.F.; Fattahi, A.; Oman, K.A.

Mass-Discrepancy Acceleration Relation: A Natural Outcome of Galaxy Formation in Cold Dark Matter Halos Thumbnail


Authors

A.D. Ludlow

A. Benítez-Llambay

M. Schaller

R. Bower

J. Schaye

R.A. Crain

J.F. Navarro

A. Fattahi

K.A. Oman



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 active galactic nuclei 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 † , 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.

Citation

Ludlow, A., Benítez-Llambay, A., Schaller, M., Theuns, T., Frenk, C., Bower, R., …Oman, K. (2017). Mass-Discrepancy Acceleration Relation: A Natural Outcome of Galaxy Formation in Cold Dark Matter Halos. Physical Review Letters, 118(16), Article 161103. https://doi.org/10.1103/physrevlett.118.161103

Journal Article Type Article
Acceptance Date Oct 24, 2016
Online Publication Date Apr 21, 2017
Publication Date Apr 21, 2017
Deposit Date Jul 18, 2017
Publicly Available Date Jul 18, 2017
Journal Physical Review Letters
Print ISSN 0031-9007
Electronic ISSN 1079-7114
Publisher American Physical Society
Peer Reviewed Peer Reviewed
Volume 118
Issue 16
Article Number 161103
DOI https://doi.org/10.1103/physrevlett.118.161103
Public URL https://durham-repository.worktribe.com/output/1352982

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Copyright Statement
Reprinted with permission from the American Physical Society: Ludlow A. D., Benítez-Llambay A., Schaller M., Theuns T., Frenk C. S., Bower R., Schaye J., Crain R. A. Navarro J. F., Fattahi A. & Oman K. A. (2017). Mass-Discrepancy Acceleration Relation: A Natural Outcome of Galaxy Formation in Cold Dark Matter Halos. Physical Review Letters 118(16): 161103 © 2017 by the American Physical Society. Readers may view, browse, and/or download material for temporary copying purposes only, provided these uses are for noncommercial personal purposes. Except as provided by law, this material may not be further reproduced, distributed, transmitted, modified, adapted, performed, displayed, published, or sold in whole or part, without prior written permission from the American Physical Society.






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