Lee, K-G;
Krolewski, A;
White, M;
Schlegel, D;
Nugent, PE;
Hennawi, JF;
Muller, T;
... Tran, K-VH; + view all
(2018)
First Data Release of the COSMOS Ly alpha Mapping and Tomography Observations: 3D Ly alpha Forest Tomography at 2.05 < z < 2.55.
The Astrophysical Journal Supplement Series
, 237
(2)
, Article 31. 10.3847/1538-4365/aace58.
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Abstract
Faint star-forming galaxies at z ~ 2–3 can be used as alternative background sources to probe the Lyα forest in addition to quasars, yielding high sightline densities that enable 3D tomographic reconstruction of the foreground absorption field. Here, we present the first data release from the COSMOS Lyα Mapping And Tomography Observations (CLAMATO) Survey, which was conducted with the LRIS spectrograph on the Keck I telescope. Over an observational footprint of 0.157 deg2 within the COSMOS field, we used 240 galaxies and quasars at 2.17 < z < 3.00, with a mean comoving transverse separation of $2.37\,{h}^{-1}\,\mathrm{Mpc}$, as background sources probing the foreground Lyα forest absorption at 2.05 < z < 2.55. The Lyα forest data was then used to create a Wiener-filtered tomographic reconstruction over a comoving volume of $3.15\,\times {10}^{5}\,{h}^{-3}\,{\mathrm{Mpc}}^{3}$ with an effective smoothing scale of $2.5\,{h}^{-1}\,\mathrm{Mpc}$. In addition to traditional figures, this map is also presented as a virtual-reality visualization and manipulable interactive figure. We see large overdensities and underdensities that visually agree with the distribution of coeval galaxies from spectroscopic redshift surveys in the same field, including overdensities associated with several recently discovered galaxy protoclusters in the volume. Quantitatively, the map signal-to-noise is ${\rm{S}}/{{\rm{N}}}^{\mathrm{wiener}}\approx 3.4$ over a 3 h −1Mpc top-hat kernel based on the variances estimated from the Wiener filter. This data release includes the redshift catalog, reduced spectra, extracted Lyα forest pixel data, and reconstructed tomographic map of the absorption. These can be downloaded from Zenodo (10.5281/zenodo.1292459).
| Type: | Article |
|---|---|
| Title: | First Data Release of the COSMOS Ly alpha Mapping and Tomography Observations: 3D Ly alpha Forest Tomography at 2.05 < z < 2.55 |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.3847/1538-4365/aace58 |
| Publisher version: | https://doi.org/10.3847/1538-4365/aace58 |
| Language: | English |
| Additional information: | This is the published version of record. For information on re-use, please refer to the publisher’s terms and conditions. |
| Keywords: | intergalactic medium, large-scale structure of universe, quasars: absorption lines, surveys, techniques: spectroscopic |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10055344 |
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