Mathematics – Logic
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9195c&link_type=abstract
HST Proposal ID #9195
Mathematics
Logic
Hst Proposal Id #9195 Quasar Absorption Lines And Igm
Scientific paper
We propose to combine archival UV HST spectra of close QSO pairs with a large sample of similar optical spectra in order to determine the clustering strength of intergalactic H I absorption {the Lyman Alpha forest} with the intent of constraining hydrodynamic/gravitational models of structure formation in the early Universe. Furthermore, this dataset will allow a comparison of radial versus transverse clustering for weak overdensities in the Universe. Since radial versus transverse size for objects co-expanding with the Hubble flow is an excellent measure of the cosmological constant Lambda, and since the Lyman Alpha forest is relatively weakly clustered, the shape of its clustering function in radial versus transverse dimensions is an excellent prospect for uncovering the value of Lambda. We would like to fully analyze the close QSO pairs in the archive, including several that remain unpublished after many years, and combine these with high quality optical spectra extending blueward to atmospheric cutoff in order to provide study of Lyman Alpha forest structure that is as free as possible of systematic errors due to interloping metal lines. Such a study might not only determine Lambda, but lead to an independent, new measure of the density of normal matter Omega_baryon, the strength of ionizing radiation flux in the early Universe, and better constraints on other cosmological parameters open to study after testing numerical models of the Lyman Alpha forest can be trusted.
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