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Title: Testing MONDian dark matter with galactic rotation curves

MONDian dark matter (MDM) is a new form of dark matter quantum that naturally accounts for Milgrom's scaling, usually associated with modified Newtonian dynamics (MOND), and theoretically behaves like cold dark matter (CDM) at cluster and cosmic scales. In this paper, we provide the first observational test of MDM by fitting rotation curves to a sample of 30 local spiral galaxies (z ≈ 0.003). For comparison, we also fit the galactic rotation curves using MOND and CDM. We find that all three models fit the data well. The rotation curves predicted by MDM and MOND are virtually indistinguishable over the range of observed radii (∼1 to 30 kpc). The best-fit MDM and CDM density profiles are compared. We also compare with MDM the dark matter density profiles arising from MOND if Milgrom's formula is interpreted as Newtonian gravity with an extra source term instead of as a modification of inertia. We find that discrepancies between MDM and MOND will occur near the center of a typical spiral galaxy. In these regions, instead of continuing to rise sharply, the MDM mass density turns over and drops as we approach the center of the galaxy. Our results show that MDM, which restrictsmore » the nature of the dark matter quantum by accounting for Milgrom's scaling, accurately reproduces observed rotation curves.« less
Authors:
 [1] ; ; ;  [2] ;  [3] ;  [4]
  1. Department of Physics, Emory and Henry College, Emory, VA 24327 (United States)
  2. Department of Physics, Virginia Tech, Blacksburg, VA 24061 (United States)
  3. Department of Physics and Astronomy, Vanderbilt University, Nashville, TN 37235 (United States)
  4. Institute of Field Physics, Department of Physics and Astronomy, University of North Carolina, Chapel Hill, NC 27599 (United States)
Publication Date:
OSTI Identifier:
22365013
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal; Journal Volume: 793; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; COMPARATIVE EVALUATIONS; DENSITY; GALAXIES; GRAVITATION; MASS; MODIFICATIONS; MOMENT OF INERTIA; NONLUMINOUS MATTER; ROTATION; SCALING