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In this work we expand upon the Tomographic Absorption Reconstruction andDensity Inference Scheme (TARDIS) in order to include multiple tracers whilereconstructing matter density fields at Cosmic Noon (z ~ 2-3). In particular,we jointly reconstruct the underlying density field from simulated Lyman-Alphaforest observations at $z\sim 2.5$ and an overlapping galaxy survey. We findthat these data are synergistic, with the Lyman Alpha forest providingreconstruction of low density regions and galaxy surveys tracing the densitypeaks. We find a more accurate power spectra reconstruction going to higherscales when fitting these two data-sets simultaneously than if using either oneindividually. When applied to cosmic web analysis, we find performing the jointanalysis is equivalent to a Lyman Alpha survey with significantly increasedsight-line spacing. Since we reconstruct the velocity field and matter fieldjointly, we demonstrate the ability to evolve the mock observed volume furtherto z=0, allowing us to create a rigorous definition of "proto-cluster" asregions which will evolve into clusters. We apply our reconstructions to studyprotocluster structure and evolution, finding for realistic survey parameterswe can provide accurate mass estimates of the z \approx 2 structures and theirz = 0 fate.

astrophysical journal/the astrophysical journal

TARDIS Paper II: Synergistic Density Reconstruction from Lyman-alpha  Forest and Spectroscopic Galaxy Surveys with Applications to Protoclusters  and the Cosmic Web