Additionally, it hopes to provide a measure of the local environmental density at the positions of individual galaxies with a 2.2 < z < 2.5 redshift. The survey aims to make the first characterization of sheets and filaments of the high-redshift cosmic web. ![]() This project will allow the first characterization of galaxy environments at the given redshifts as well as studying extended voids and protoclusters. One can then tomographically interpolate across the adjacent lines-of-sight to yield 3D maps of the IGM HI absorption, which is a non-linear tracer of the cosmic web in dark matter.ĭue to the long (∼ 400 h −1 Mpc) path length in the Lyα forest probed by each background source, this technique allows the mapping of large volumes at z > 2. This technique expands upon the HI Lyα forest analysis of IGM absorption that is traditionally carried out along relatively rare quasar lines-of-sight by targeting ubiquitous star-forming Lyman-Break galaxies (LBGs) and faint quasars at z ∼ 2 − 3 as background sources. CLAMATO LMAP survey’s goal is to map the z ∼ 2.3 cosmic web with Lyα forest tomography using Keck-I/LRIS to collect data.
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