http://arxiv.org/abs/2109.09660
We present the second data release of the COSMOS Lyman-Alpha Mapping And Tomography Observations (CLAMATO) Survey conducted with the LRIS spectrograph on the Keck-I telescope. This project used \lyaf{} absorption in the spectra of faint star forming galaxies and quasars at z~ 2-3 to trace neutral hydrogen in the intergalactic medium. In particular, we use 377 objects over a footprint of ~0.2 deg^2 to reconstruct the absorption field at 2.05 < z < 2.55. We apply a Wiener filtering technique to the observed data to reconstruct three dimensional maps of the field over a volume of 4.1 x 10^5 (h^{-1} Mpc)^3. In addition to the filtered flux maps, for the first time we infer the underlying dark matter field through a forward modelling framework from a joint likelihood of galaxy and \lyaf{} data, finding clear examples of cosmic voids, filaments, and nodes. This work constitutes the highest redshift identification of the large scale cosmic web. In addition to traditional figures, we present a number of interactive three dimensional models to allow exploration of the data and qualitative comparisons to known galaxy surveys. We find that our inferred over-densities are consistent with those found from galaxy fields. We will make all our reduced spectra, extracted Lyman-alpha forest pixel data, and reconstructed tomographic maps available publicly upon publication.
B. Horowitz, K. Lee, M. Ata, et. al.
Tue, 21 Sep 21
67/85
Comments: 18 pages, 13 figures. arXiv admin note: text overlap with arXiv:1710.02894
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