On the Baryon Content of the Universe

Details On the Baryon Content of the Universe On the Baryon Content of the Universe

Mar 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994mnras.267...13b&link_type=abstract

Monthly Notices of the Royal Astronomical Society, Vol. 267, NO. 1/MAR1, P. 13, 1994

Astronomy and Astrophysics

Astronomy

32

Scientific paper

It is often stated that there are insufficient baryons in galaxies and 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, α, and the mass-to-light ratio index, η. 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 <= {OMEGA}_b_h_50_^2^<=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.

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