Self-consistent models of triaxial galaxies in MOND gravity

You-Gang Wang, Xufen Wu, Hongsheng Zhao

Research output: Contribution to journalArticlepeer-review

12 Citations (Scopus)

Abstract

The Bekenstein- Milgrom gravity theory with a modified Poisson equation is tested here for the existence of triaxial equilibrium solutions. Using the nonnegative least- square method, we show that self- consistent triaxial galaxies exist for baryonic models with a mild density cusp, rho similar to Sigma/r. Self- consistency is achieved for a wide range of central concentrations, Sigma similar to 10-1000 M-circle dot pc(-2), representing low to high surface brightness galaxies. Our results demonstrate for the first time that the orbit superposition technique is fruitful for constructing galaxy models beyond Newtonian gravity, and triaxial cuspy galaxies might exist without the help of cold dark matter.

Original languageEnglish
Pages (from-to)1033-1039
Number of pages7
JournalAstrophysical Journal
Volume677
Issue number2
DOIs
Publication statusPublished - 20 Apr 2008

Keywords

  • galaxies : kinematics and dynamics
  • methods : numerical
  • MODIFIED NEWTONIAN DYNAMICS
  • DARK-MATTER
  • ELLIPTIC GALAXIES
  • DWARF GALAXIES
  • DISC GALAXIES
  • ROTATION
  • PROFILES
  • ENERGY
  • HALOS
  • MASS

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