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Journal Article

First Data Release of the COSMOS Lyα Mapping and Tomography Observations: 3D Lyα Forest Tomography at 2.05 < z < 2.55

MPS-Authors

Lee,  Khee-Gan
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Krolewski,  Alex
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

White,  Martin
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Schlegel,  David
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nugent,  Peter E.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Hennawi,  Joseph F.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Müller,  Thomas
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Pan,  Richard
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Prochaska,  J. Xavier
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Font-Ribera,  Andreu
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Suzuki,  Nao
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Glazebrook,  Karl
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kacprzak,  Glenn G.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Kartaltepe,  Jeyhan S.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Koekemoer,  Anton M.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Le Fèvre,  Olivier
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Lemaux,  Brian C.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Maier,  Christian
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Nanayakkara,  Themiya
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Rich,  R. Michael
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Sanders,  D. B.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Salvato,  Mara
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tasca,  Lidia
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

Tran,  Kim-Vy H.
Max Planck Institute for Astronomy, Max Planck Society and Cooperation Partners;

External Resource

https://ui.adsabs.harvard.edu/abs/2018ApJS..237...31L
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Citation

Lee, K.-G., Krolewski, A., White, M., Schlegel, D., Nugent, P. E., Hennawi, J. F., et al. (2018). First Data Release of the COSMOS Lyα Mapping and Tomography Observations: 3D Lyα Forest Tomography at 2.05 < z < 2.55. The Astrophysical Journal Supplement Series, 237.


Cite as: https://hdl.handle.net/21.11116/0000-0005-CC9C-6
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 &lt; z &lt; 3.00, with a mean comoving transverse separation of 2.37 {h}-1 {Mpc}, as background sources probing the foreground Lyα forest absorption at 2.05 &lt; z &lt; 2.55. The Lyα forest data was then used to create a Wiener-filtered tomographic reconstruction over a comoving volume of 3.15 × {10}5 {h}-3 {Mpc}}3 with an effective smoothing scale of 2.5 {h}-1 {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 {{S}}/{{{N}}}wiener}≈ 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).