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The radial acceleration relation is a natural consequence of the baryonic Tully-Fisher relation

Wheeler, Coral and Hopkins, Philip F. and Doré, Olivier (2019) The radial acceleration relation is a natural consequence of the baryonic Tully-Fisher relation. Astrophysical Journal, 882 (1). Art. No. 46. ISSN 1538-4357. doi:10.3847/1538-4357/ab311b.

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Galaxies covering several orders of magnitude in stellar mass and a variety of Hubble types have been shown to follow the radial acceleration relation (RAR), a relationship between g_(obs), the observed circular acceleration of the galaxy, and g_(bar), the acceleration due to the total baryonic mass of the galaxy. For accelerations above 10^(10) m s^(-2), g_(obs), traces g_(bar), asymptoting to the 1:1 line. Below this scale, there is a break in the relation such that g_(obs) ~ g_(bar)^(1/2). We show that the RAR slope, scatter, and the acceleration scale are all natural consequences of the well-known baryonic Tully–Fisher relation (BTFR). We further demonstrate that galaxies with a variety of baryonic and dark matter (DM) profiles and a wide range of dark halo and galaxy properties (well beyond those expected in Cold Dark Matter (CDM) theory) lie on the RAR if we simply require that their rotation curves satisfy the BTFR. We explore conditions needed to break this degeneracy: subkiloparsec resolved rotation curves inside of cored DM-dominated profiles and/or outside ≫ 100 kpc could lie on BTFR but deviate in the RAR, providing new constraints on DM.

Item Type:Article
Related URLs:
URLURL TypeDescription Paper
Hopkins, Philip F.0000-0003-3729-1684
Doré, Olivier0000-0002-5009-7563
Additional Information:© 2019 The American Astronomical Society. Received 2018 June 4; revised 2019 April 23; accepted 2019 July 9; published 2019 August 30. C.W. is supported by the Lee A. DuBridge Postdoctoral Scholarship in Astrophysics. Support for P.F.H. was provided by an Alfred P. Sloan Research Fellowship, NSF Collaborative Research Grant #1715847, and CAREER grant #1455342. Part of the research was carried out at the Jet Propulsion Laboratory, California Institute of Technology, under a contract with the National Aeronautics and Space Administration.
Group:TAPIR, Astronomy Department
Funding AgencyGrant Number
Lee A. DuBridge FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:galaxies: fundamental parameters – galaxies: kinematics and dynamics
Issue or Number:1
Record Number:CaltechAUTHORS:20190206-105541773
Persistent URL:
Official Citation:Coral Wheeler et al 2019 ApJ 882 46
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:92714
Deposited By: George Porter
Deposited On:08 Feb 2019 20:45
Last Modified:16 Nov 2021 03:52

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