THE COSMIC BARYON BUDGET

@article{Fukugita1997THECB,
  title={THE COSMIC BARYON BUDGET},
  author={Masataka Fukugita and Craig Hogan and Phillip James Edwin Peebles},
  journal={The Astrophysical Journal},
  year={1997},
  volume={503},
  pages={518-530}
}
We present an estimate of the global budget of baryons in all states, with conservative estimates of the uncertainties, based on all relevant information we have been able to marshal. Most of the baryons today are still in the form of ionized gas, which contributes a mean density uncertain by a factor of about 4. Stars and their remnants are a relatively minor component, comprising for our best-guess plasma density only about 17% of the baryons, while populations contributing most of the blue… 

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