Milky Way and M31 rotation curves: ?cDM versus MOND

De Chang Dai; Glenn Starkman; Dejan Stojkovic

doi:10.1103/PhysRevD.105.104067

Milky Way and M31 rotation curves: ?cDM versus MOND

De Chang Dai
, Glenn Starkman
, Dejan Stojkovic

Physics

Yangzhou University
Case Western Reserve University

Research output: Contribution to journal › Article › peer-review

11 Scopus citations

Abstract

We analyze the existing rotation-curve data of the Milky Way and M31 galaxies that extend to very large distances and low accelerations. We find a systematic downward trend in the weak acceleration (large distances) segment of the radial acceleration. A similar downward trend has been noticed in the ?CDM EAGLE simulation [Phys. Rev. D 96, 124016 (2017).PRVDAQ2470-001010.1103/PhysRevD.96.124016], while the deviation from the generic MOND prediction would need to be ascribed to an external field effect, or possibly a post facto selected acceleration function µ(x).

Original language	English
Article number	104067
Journal	Physical Review D
Volume	105
Issue number	10
DOIs	https://doi.org/10.1103/PhysRevD.105.104067
State	Published - May 15 2022

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abstract = "We analyze the existing rotation-curve data of the Milky Way and M31 galaxies that extend to very large distances and low accelerations. We find a systematic downward trend in the weak acceleration (large distances) segment of the radial acceleration. A similar downward trend has been noticed in the ?CDM EAGLE simulation [Phys. Rev. D 96, 124016 (2017).PRVDAQ2470-001010.1103/PhysRevD.96.124016], while the deviation from the generic MOND prediction would need to be ascribed to an external field effect, or possibly a post facto selected acceleration function µ(x).",

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AB - We analyze the existing rotation-curve data of the Milky Way and M31 galaxies that extend to very large distances and low accelerations. We find a systematic downward trend in the weak acceleration (large distances) segment of the radial acceleration. A similar downward trend has been noticed in the ?CDM EAGLE simulation [Phys. Rev. D 96, 124016 (2017).PRVDAQ2470-001010.1103/PhysRevD.96.124016], while the deviation from the generic MOND prediction would need to be ascribed to an external field effect, or possibly a post facto selected acceleration function µ(x).

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Milky Way and M31 rotation curves: ?cDM versus MOND

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