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      What do gas-rich galaxies actually tell us about modified Newtonian dynamics?

      1 ,
      Physical review letters
      American Physical Society (APS)

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          Abstract

          It has recently been claimed that measurements of the baryonic Tully-Fisher relation (BTFR), a power-law relationship between the observed baryonic masses and outer rotation velocities of galaxies, support the predictions of modified Newtonian dynamics for the slope and scatter in the relation, while challenging the cold dark matter (CDM) paradigm. We investigate these claims, and find that (1) the scatter in the data used to determine the BTFR is in conflict with observational uncertainties on the data, (2) these data do not make strong distinctions regarding the best-fit BTFR parameters, (3) the literature contains a wide variety of measurements of the BTFR, many of which are discrepant with the recent results, and (4) the claimed CDM "prediction" for the BTFR is a gross oversimplification of the complex galaxy-scale physics involved. We conclude that the BTFR is currently untrustworthy as a test of CDM.

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          Author and article information

          Journal
          Phys Rev Lett
          Physical review letters
          American Physical Society (APS)
          1079-7114
          0031-9007
          Apr 06 2012
          : 108
          : 14
          Affiliations
          [1 ] Department of Physics and Astronomy, University of British Columbia, Vancouver, British Columbia, V6T 1Z1 Canada. sfore@stanford.edu
          Article
          10.1103/PhysRevLett.108.141302
          22540783
          583f30c1-b4d4-4e57-b2cf-719893908b83
          © 2012 American Physical Society
          History

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