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

2017/10/31 by Khee-Gan Lee, Alex Krolewski, Martin White +22 · 1 citation
Physics and Astronomy · #Astronomy and Astrophysical Research #Astrophysics and Star Formation Studies #Cosmology #Galaxies: Formation, Evolution, Phenomena #Galaxy #Quasar #Redshift #Smoothing #Tomographic reconstruction #Tomography #astro-ph.CO #astro-ph.GA

paper · pdf · doi:10.3847/1538-4365/aace58

published as 2018 ApJS, 237, 2 · 22 pages, 12 figures accepted in ApJ Supplements. Google Cardboard-compatible video can be viewed on https://youtu.be/QGtXi7P4u4g

openalex created_date 2017/10/20 · openalex publication_date 2018/08/01 · arxiv created 2018/08/03 · arxiv updated 2018/08/08 · openalex updated_date 2026/08/05

Abstract

Abstract Faint star-forming galaxies at z ∼ 2–3 can be used as alternative background sources to probe the Ly α 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 Ly α 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 deg 2 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 , as background sources probing the foreground Ly α forest absorption at 2.05 &lt; z &lt; 2.55. The Ly α forest data was then used to create a Wiener-filtered tomographic reconstruction over a comoving volume of with an effective smoothing scale of . 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 over a 3 h −1 Mpc top-hat kernel based on the variances estimated from the Wiener filter. This data release includes the redshift catalog, reduced spectra, extracted Ly α forest pixel data, and reconstructed tomographic map of the absorption. These can be downloaded from Zenodo ( 10.5281/zenodo.1292459 ).

Citations

• Cosmological Parameters σ8, the Baryon Density Ωb, the Vacuum Energy Density ΩΛ, the Hubble Constant and the UV Background Intensity from a Calibrated Measurement of HiLyα Absorption atz = 1.9
• Inversion of the Lymanαforest: three-dimensional investigation of the intergalactic medium
• Recovery of the Power Spectrum of Mass Fluctuations from Observations of the Lyα Forest
• Luminosity function from dedicated SDSS-III and MMT data of quasars in 0.7 <z< 4.0 selected with a new approach
• The Lyman-α forest in three dimensions: measurements of large scale flux correlations from BOSS 1st-year data
• Baryon acoustic oscillations in the Lyαforest of BOSS DR11 quasars
• Multiwavelength Constraints on the Cosmic Star Formation History from Spectroscopy: The Rest‐Frame Ultraviolet, Hα, and Infrared Luminosity Functions at Redshifts 1.9 ≲z≲ 3.4
• ZFIRE: A KECK/MOSFIRE SPECTROSCOPIC SURVEY OF GALAXIES IN RICH ENVIRONMENTS AT z ∼ 2
• Rest‐Frame Ultraviolet Spectra of \documentclassaastex \usepackageamsbsy \usepackageamsfonts \usepackageamssymb \usepackagebm \usepackagemathrsfs \usepackagepifont \usepackagestmaryrd \usepackagetextcomp \usepackageportland,xspace \usepackageamsmath,amsxtra \usepackage[OT2,OT1]fontenc \newcommand\cyr \renewcommand\rmdefaultwncyr \renewcommand\sfdefaultwncyss \renewcommand\encodingdefaultOT2 \normalfont \selectfont \DeclareTextFontCommand\textcyr\cyr \pagestyleempty \DeclareMathSizes10976 \begindocument \landscape z∼ 3 \enddocument Lyman Break Galaxies

Cited by

• The Intergalactic Medium