Mathematics – Logic
Scientific paper
Jul 2001
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001hst..prop.9137i&link_type=abstract
HST Proposal ID #9137
Mathematics
Logic
Hst Proposal Id #9137 Quasar Absorption Lines And Igm
Scientific paper
We propose STIS spectroscopy of 15 bright {V < 18} quasars in a 22 square degree region that has well-sampled galaxy redshifts. This is a unique asterism of quasars of this brightness. The spectra will yield 183 Lyman-alpha absorbers, 119 of which will be in the range 0 < z < 0.2, with rest equivalent widths complete to 0.21 Angstroms. This grid of probes will allow the most sensitive test of absorber-absorber and absorber- galaxy clustering ever. On the typical transverse scales between lines of sight of 1-2 h_100^-1 Mpc, we will be able to detect absorber-absorber correlation that is 10-20 times weaker than galaxy-galaxy correlations. With a typical number of absorbers per sightline of 13, the 630 h_100^-1 Mpc depth of the volume can be used to locate absorbers with respect to sheets and voids in the galaxy distribution. The coherence length and correlation strength of the absorbers will be compared against cosmological hydrodynamic simulations of the local universe, using similar methods to select absorption lines in the data and the simulations. The quasar spectra can be used to directly measure the power spectrum of fluctuations on scales of 1-10 h_100^-1 Mpc, and the quiescence of the cosmic velocity field on scales of 1-2 h_100^-1 Mpc. Lyman- alpha absorbers are expected to trace the underlying dark matter potential, and their use in measuring large scale structure is an important complement to the use of galaxy redshift surveys.
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