A new paper, led by Alex Krolewski (UC Berkeley) has been submitted to arXiv. This uses cosmological simulations to study how IGM tomography maps could be used to to constrain alignments between galaxy spins or shapes with the underlying cosmic web at z~2.5.
We will presenting VR visualizations of CLAMATO Survey data at the Vision+Light: Extending the Senses outreach event in Berkeley. This will be at 5:30-8:30pm on Thursday and Friday, Oct 27-28, 2016, at Energy Biosciences Institute in UC Berkeley (intersection of Hearst and Oxford). Come experience our 3D IGM tomography map, as well as other awesome exhibits!
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. 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. 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.
Due 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 project will allow the first characterization of galaxy environments at the given redshifts as well as studying extended voids and protoclusters.
Area covered in the survey:
The survey aims to make the first characterization of sheets and filaments of the high-redshift cosmic web. 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.