ON THE BARYON CONTENT OF THE UNIVERSE

PD BRISTOW*, S PHILLIPPS

*Corresponding author for this work

Research output: Contribution to journalArticle (Academic Journal)peer-review

Abstract

It is often stated that there are insufficient baryons in galaxies an clusters to satisfy the constraints imposed by primordial nucleosynthesis. Here a recent analysis of the baryon content of the Universe by Persic & Salucci is reconsidered, with the aim of estimating the uncertainties induced in the results by uncertainties in the galaxy population parameters used. The estimates of OMEGA(b) turn out to be dependent upon poorly constrained input parameters, in particular the luminosity-function slope parameter, alpha, and the mass-to-light ratio index, eta. It is found that with different, but allowed, choices of input parameters - which admit of large numbers of low-luminosity galaxies - a value of the baryon density consistent with standard primordial nucleosynthesis (0.040 less-than-or-equal-to OMEGA(b) h(2)50 less-than-or-equal-to 0.064) can be recovered. Thus it is not necessarily the case that the majority of baryons in the Universe are in unobservable forms, although it remains true that most are currently unobserved.

Original languageEnglish
Pages (from-to)13-18
Number of pages6
JournalMonthly Notices of the Royal Astronomical Society
Volume267
Issue number1
Publication statusPublished - 1 Mar 1994

Keywords

  • GALAXIES, FUNDAMENTAL PARAMETERS
  • GALAXIES, LUMINOSITY FUNCTION, MASS FUNCTION
  • COSMOLOGY, MISCELLANEOUS
  • SURFACE BRIGHTNESS GALAXIES
  • DWARF SPHEROIDAL GALAXY
  • LUMINOSITY FUNCTION
  • REDSHIFT SURVEY
  • FIELD GALAXIES
  • GLOBULAR-CLUSTERS
  • SPIRAL GALAXIES
  • X-RAY
  • FORNAX
  • EVOLUTION

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