The link between the baryonic mass distribution and the rotation curve shape

R. A. Swaters*, R. Sancisi, J. M. van der Hulst, T. S. van Albada

*Corresponding author for this work

Research output: Contribution to journalArticleAcademicpeer-review

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Abstract

The observed rotation curves of disc galaxies, ranging from late-type dwarf galaxies to early-type spirals, can be fitted remarkably well simply by scaling up the contributions of the stellar and H?i discs. This baryonic scaling model can explain the full breadth of observed rotation curves with only two free parameters. For a small fraction of galaxies, in particular early-type spiral galaxies, H?i scaling appears to fail in the outer parts, possibly due to observational effects or ionization of H?i. The overall success of the baryonic scaling model suggests that the well-known global coupling between the baryonic mass of a galaxy and its rotation velocity (known as the baryonic TullyFisher relation) applies at a more local level as well, and it seems to imply a link between the baryonic mass distribution and the distribution of total mass (including dark matter).

Original languageEnglish
Pages (from-to)2299-2308
Number of pages10
JournalMonthly Notices of the Royal Astronomical Society
Volume425
Issue number3
DOIs
Publication statusPublished - Sep-2012

Keywords

  • galaxies: dwarf
  • galaxies: kinematics and dynamics
  • galaxies: spiral
  • WESTERBORK HI SURVEY
  • URSA-MAJOR CLUSTER
  • TULLY-FISHER RELATION
  • SPIRAL GALAXIES
  • DARK-MATTER
  • DWARF GALAXIES
  • IRREGULAR GALAXIES
  • SURFACE PHOTOMETRY
  • NEWTONIAN DYNAMICS
  • NEUTRAL HYDROGEN

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