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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 (2018) The radial acceleration relation is a natural consequence of the baryonic Tully-Fisher relation. . (Unpublished)

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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 gbar, asymptoting to the 1:1 line. Below this scale, there is a break in the relation such that gobs∼g^(1/2)_bar. 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 CDM) lie on the RAR if we simply require that their rotation curves satisfy the BTFR. We explore conditions needed to break this degeneracy: sub-kpc resolved rotation curves inside of "cored" DM-dominated profiles and/or outside ≫ 100kpc could lie on BTFR but deviate in the RAR, providing new constraints on DM.

Item Type:Report or Paper (Discussion Paper)
Related URLs:
URLURL TypeDescription Paper
Hopkins, Philip F.0000-0003-3729-1684
Doré, Olivier0000-0002-5009-7563
Additional Information:CW is supported by the Lee A. DuBridge Postdoctoral Scholarship in Astrophysics. Support for PFH 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.
Funding AgencyGrant Number
Lee A. DuBridge FoundationUNSPECIFIED
Alfred P. Sloan FoundationUNSPECIFIED
Subject Keywords:galaxies: fundamental parameters – galaxies: kinematics and dynamics
Record Number:CaltechAUTHORS:20190206-105541773
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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:08 Feb 2019 20:45

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