Misc,
Second Data Release of the COSMOS Lyman-alpha Mapping and Tomographic Observation: The First 3D Maps of the Large-Scale Cosmic Web at 2.05<z<2.55
(2021)cite arxiv:2109.09660Comment: 18 pages, 13 figures. arXiv admin note: text overlap with arXiv:1710.02894.
Abstract
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 łyaf 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 łyaf 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.
