The connection between shear and star formation in spiral galaxies

Marc S. Seigar

Research output: Contribution to journalLetterpeer-review

28 Scopus citations

Abstract

We present a sample of 33 galaxies for which we have calculated (i) the average rate of shear from published rotation curves, (ii) the far-infrared luminosity from IRAS fluxes, and (iii) the Ks-band luminosity from the Two Micron All Sky Survey (2MASS). We show that a correlation exists between the shear rate and the ratio of the far-infrared to Ks-band luminosity. This ratio is essentially a measure of the star formation rate per unit mass, or the specific star formation rate. From this correlation we show that a critical shear rate exists, above which star formation would turn off in the discs of spiral galaxies. Using the correlation between shear rate and spiral arm pitch angle, this shear rate corresponds to the lowest pitch angles typically measured in near-infrared images of spiral galaxies.

Original languageEnglish (US)
Pages (from-to)L20-L24
JournalMonthly Notices of the Royal Astronomical Society: Letters
Volume361
Issue number1
DOIs
StatePublished - Jul 2005

Keywords

  • Galaxies: fundamental parameters
  • Galaxies: spiral
  • Infrared: galaxies

Fingerprint

Dive into the research topics of 'The connection between shear and star formation in spiral galaxies'. Together they form a unique fingerprint.

Cite this