Revealing the Universe on Gigaparsec

Details Revealing the Universe on Gigaparsec Revealing the Universe on Gigaparsec

Jul 1995

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995hst..prop.5813s&link_type=abstract

HST Proposal ID #5813

Physics

Hst Proposal Id #5813 Quasars

Scientific paper

Between the wavelength scales corresponding to the anisotropy detected by COBE and the scales probed by current galaxy redshift surveys lies an order of magnitude gap in our knowledge of large-scale clustering in the universe. To measure power on the missing scales, we propose to analyze the spatial distribution of QSO absorption line systems from archival HST spectra. These absorption systems probe a much larger volume than any of the galaxy surveys, with almost isotropic coverage. The different species of absorbers {Ly- alpha vs. metals} measure different aspects of the intervening mass distribution and may exhibit different clustering properties and cross-correlation with deep galaxy samples. Applying innovative statistical tools, we will measure the large-scale 3D power spectrum of the Ly-alpha absorbers, taking advantage of the isotropy of the quasar sample, and the cross-correlation power spectra {1D and 3D} between the Ly- alpha, metal systems, and normal galaxies of our existing deep redshift surveys, to elucidate the physical relationship of these systems.

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