A comparison of independent star formation diagnostics for an ultraviolet-selected sample of nearby galaxies

Mark Sullivan*, Bahram Mobasher, Ben Chan, Lawrence Cram, Richard Ellis, Marie Treyer, Andrew Hopkins

*Corresponding author for this work

Research output: Contribution to journalReview article

100 Citations (Scopus)

Abstract

We present results from a decimetric radio survey undertaken with the Very Large Array as part of a longer term goal to intercompare star formation and dust extinction diagnostics on a galaxy-by-galaxy basis for a representative sample of nearby galaxies. For our survey field, Selected Area 57, star formation rates derived from 1.4 GHz luminosities are compared with earlier nebular emission-line and ultraviolet (UV) continuum diagnostics. We find broad correlations, over several decades in luminosity, between the Hα, UV continuum, and 1.4 GHz diagnostics. However, the scatter in these relations is found to be larger than observational errors, with offsets between the observed relations and those expected assuming constant star formation histories and luminosity-independent extinction models. We investigate the physical origin of the observed relations and conclude that the discrepancies between different star formation diagnostics can only be partly explained by simple models of dust extinction in galaxies. These models cannot by themselves explain all the observed differences, introducing the need for temporally varying star formation histories and/or more complex models of extinction to explain the entire data set.

Original languageEnglish
Pages (from-to)72-80
Number of pages9
JournalAstrophysical Journal
Volume558
Issue number1 PART 1
DOIs
Publication statusPublished - 1 Sep 2001
Externally publishedYes

Keywords

  • Galaxies: Evolution
  • Galaxies: Starburst
  • Radio continuum: Galaxies
  • Stars: Formation
  • Surveys
  • Ultraviolet: Galaxies

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