The link between mass distribution and starbursts in dwarf galaxies

Kristen B.W. McQuinn, Federico Lelli, Evan D. Skillman, Andrew E. Dolphin, Stacy S. McGaugh, Benjamin F. Williams

Research output: Contribution to journalArticle

10 Scopus citations

Abstract

Recent studies have shown that starburst dwarf galaxies have steeply rising rotation curves in their inner parts, pointing to a close link between the intense star formation and a centrally concentrated mass distribution (baryons and dark matter). More quiescent dwarf irregulars typically have slowly rising rotation curves, although some 'compact' irregulars with steep, inner rotation curves exist. We analyse archival Hubble Space Telescope images of two nearby 'compact' irregular galaxies (NGC 4190 and NGC 5204), which were selected solely on the basis of their dynamical properties and their proximity. We derive their recent star formation histories by fitting colour-magnitude diagrams of resolved stellar populations, and find that the star formation properties of both galaxies are consistent with those of known starburst dwarfs. Despite the small sample, this strongly reinforces the notion that the starburst activity is closely related to the inner shape of the potential well.

Original languageEnglish (US)
Pages (from-to)3886-3892
Number of pages7
JournalMonthly Notices of the Royal Astronomical Society
Volume450
Issue number4
DOIs
StatePublished - Apr 24 2015

Keywords

  • Galaxies: dwarf
  • Galaxies: kinematics and dynamics
  • Galaxies: starburst

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