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    The CO Luminosity Density at High-z (COLDz) Survey: A Sensitive, Large-area Blind Search for Low-J CO Emission from Cold Gas in the Early Universe with the Karl G. Jansky Very Large Array

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    Pavesi_2018_ApJ_864_49.pdf
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    Final Published version
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    Author
    Pavesi, Riccardo
    Sharon, Chelsea E.
    Riechers, Dominik A. cc
    Hodge, Jacqueline A.
    Decarli, R. cc
    Walter, Fabian cc
    Carilli, Chris L. cc
    Daddi, Emanuele cc
    Smail, Ian
    Dickinson, Mark
    Ivison, Rob J.
    Sargent, Mark cc
    Cunha, Elisabete da
    Aravena, Manuel
    Darling, Jeremy cc
    Smolčić, Vernesa
    Scoville, Nicholas Z.
    Capak, Peter L.
    Wagg, Jeff
    Show allShow less
    Affiliation
    Univ Arizona, Steward Observ
    Issue Date
    2018-09-01
    Keywords
    galaxies: evolution
    galaxies: formation
    galaxies: high-redshift
    galaxies: ISM
    radio lines: galaxies
    surveys
    
    Metadata
    Show full item record
    Publisher
    IOP PUBLISHING LTD
    Citation
    Riccardo Pavesi et al 2018 ApJ 864 49
    Journal
    ASTROPHYSICAL JOURNAL
    Rights
    © 2018. The American Astronomical Society. All rights reserved.
    Collection Information
    This item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.
    Abstract
    We describe the CO Luminosity Density at High-z (COLDz) survey, the first spectral line deep field targeting CO(1-0) emission from galaxies at z = 1.95-2.85 and CO(2-1) at z = 4.91-6.70. The main goal of COLDz is to constrain the cosmic density of molecular gas at the peak epoch of cosmic star formation. By targeting both a wide (similar to 51 arcmin(2)) and a deep (similar to 9 arcmin(2)) area, the survey is designed to robustly constrain the bright end and the characteristic luminosity of the CO(1-0) luminosity function. An extensive analysis of the reliability of our line candidates and new techniques provide detailed completeness and statistical corrections as necessary to determine the best constraints to date on the CO luminosity function. Our blind search for CO(1-0) uniformly selects starbursts and massive main-sequence galaxies based on their cold molecular gas masses. Our search also detects CO(2-1) line emission from optically dark, dusty star-forming galaxies at z > 5. We find a range of spatial sizes for the CO-traced gas reservoirs up to similar to 40 kpc, suggesting that spatially extended cold molecular gas reservoirs may be common in massive, gas-rich galaxies at z similar to 2. Through CO line stacking, we constrain the gas mass fraction in previously known typical star-forming galaxies at z = 2-3. The stacked CO detection suggests lower molecular gas mass fractions than expected for massive main-sequence galaxies by a factor of similar to 3-6. We find total CO line brightness at similar to 34 GHz of 0.45 +/- 0.2 mu K, which constrains future line intensity mapping and CMB experiments.
    ISSN
    1538-4357
    DOI
    10.3847/1538-4357/aacb79
    Version
    Final published version
    Sponsors
    National Science Foundation [AST-1614213]; NRAO [SOSPA3-008]; ERC Advanced Grant DUSTYGAL [321334]; STFC [ST/P000541/1]; Royal Society/Wolfson Merit Award; European Union's Seventh Frame-work program [337595]; ERC [321302]; 3D-HST Treasury Program [GO 12177, 12328]; NASA [NAS5-26555]; VIDI research program - Netherlands Organisation for Scientific Research (NWO) [639.042.611]; Science and Technology Facilities Council [ST/P000252/1]
    Additional Links
    http://stacks.iop.org/0004-637X/864/i=1/a=49?key=crossref.056af8975060cc8957c361d0844e79d5
    ae974a485f413a2113503eed53cd6c53
    10.3847/1538-4357/aacb79
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