What causes the Ly-alpha forest, clouds or large-scale velocity fields ?
Abstract
We show that in stochastic large scale velocity fields superposed on the general Hubble flow, the formation of the GP-depression in QSO spectra is intimately related to the formation of the absorption-line structure usually called `Ly-alpha forest'. Therefore the HI-density in the diffuse IGM might be substaintially underestimated if one determines the GP-effect from the apparent continuum in high resolution spectra of QSOs. Our tentative calculations imply a current baryon density Omega_b h^2_{100} = 0.015 which agrees well with the baryon density determination from the deuterium abaundance measurement by Levshakov, Kegel and Takahara (the same volume).
Cite
@article{arxiv.astro-ph/9708063,
title = {What causes the Ly-alpha forest, clouds or large-scale velocity fields ?},
author = {W. H. Kegel and S. A. Levshakov},
journal= {arXiv preprint arXiv:astro-ph/9708063},
year = {2007}
}
Comments
2 pages, 2 Postscript figures, uses conf_iap.sty A contribution to the Proceed. 13th IAP Colloquium "Structure and Evolution of the IGM from QSO Absorption Line Systems" (Paris, July 1-5, 1997)