Vertical dynamics of disc galaxies in modified Newtonian dynamics

Carlo Nipoti, Pasquale Londrillo, Hong Sheng Zhao, Luca Ciotti

Research output: Contribution to journalArticlepeer-review

31 Citations (Scopus)

Abstract

We investigate the possibility of discriminating between modified Newtonian dynamics (MOND) and Newtonian gravity with dark matter, by studying the vertical dynamics of disc galaxies. We consider models with the same circular velocity in the equatorial plane (purely baryonic discs in MOND and the same discs in Newtonian gravity embedded in spherical dark matter haloes), and we construct their intrinsic and projected kinematical fields by solving the Jeans equations under the assumption of a two-integral distribution function. We find that the vertical velocity dispersion of deep MOND discs can be much larger than in the equivalent spherical Newtonian models. However, in the more realistic case of high surface density discs, this effect is significantly reduced, casting doubt on the possibility of discriminating between MOND and Newtonian gravity with dark matter by using current observations.

Original languageEnglish
Pages (from-to)597-604
Number of pages8
JournalMonthly Notices of the Royal Astronomical Society
Volume379
DOIs
Publication statusPublished - 1 Aug 2007

Keywords

  • gravitation
  • stellar dynamics
  • galaxies : kinematics and dynamics
  • DENSITY-POTENTIAL PAIRS
  • SURFACE MASS DENSITY
  • DARK-MATTER
  • GALACTIC DISK
  • SOLAR-SYSTEM
  • HIDDEN MASS
  • MILKY-WAY
  • MOND
  • GRAVITY
  • MODELS

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