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    AzTEC millimetre survey of the COSMOS field – III. Source catalogue over 0.72 deg^(2) and plausible boosting by large-scale structure

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    Wilson_2011_MNRAS_415(4)3831.pdf (3.656Mb)
    Issue Date
    2011-08-21
    Author
    Aretxaga, I.
    Wilson, Graham Wallace
    Aguilar, E.
    Alberts, S.
    Scott, K. S.
    Scoville, N.
    Yun, M. S.
    Austermann, J. E.
    Downes, T. P.
    Ezawa, H.
    Hatsukade, B.
    Hughes, D. H.
    Kawabe, R.
    Kohno, K.
    Oshima, T.
    Perera, Thushara A.
    Tamura, Y.
    Zeballos, M.
    Publisher
    Oxford University Press
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    We present a 0.72 deg2 contiguous 1.1-mm survey in the central area of the Cosmological Evolution Survey field carried out to a 1σ≈ 1.26 mJy beam−1 depth with the AzTEC camera mounted on the 10-m Atacama Submillimeter Telescope Experiment. We have uncovered 189 candidate sources at a signal-to-noise ratio (S/N) ≥ 3.5, out of which 129, with S/N ≥ 4, can be considered to have little chance of being spurious (≲2 per cent). We present the number counts derived with this survey, which show a significant excess of sources when compared to the number counts derived from the ∼0.5 deg2 area sampled at similar depths in the Submillimetre Common-User Bolometer Array (SCUBA) HAlf Degree Extragalactic Survey (SHADES). They are, however, consistent with those derived from fields that were considered too small to characterize the overall blank-field population. We identify differences to be more significant in the S1.1mm≳ 5 mJy regime, and demonstrate that these excesses in number counts are related to the areas where galaxies at redshifts z≲ 1.1 are more densely clustered. The positions of optical–infrared galaxies in the redshift interval 0.6 ≲z≲ 0.75 are the ones that show the strongest correlation with the positions of the 1.1-mm bright population (S1.1mm≳ 5 mJy), a result which does not depend exclusively on the presence of rich clusters within the survey sampled area. The most likely explanation for the observed excess in number counts at 1.1-mm is galaxy–galaxy and galaxy–group lensing at moderate amplification levels, which increases in amplitude as one samples larger and larger flux densities. This effect should also be detectable in other high-redshift populations.
    Description
    This article has been accepted for publication in Monthly Notices Of The Royal Astronomical Society ©: 2011. Aretxaga et al. Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
    URI
    http://hdl.handle.net/1808/17744
    DOI
    https://doi.org/10.1111/j.1365-2966.2011.18989.x
    Collections
    • Physics & Astronomy Scholarly Works [1713]
    Citation
    Aretxaga, I. et al. (2011). "AzTEC millimetre survey of the COSMOS field – III. Source catalogue over 0.72 deg^(2) and plausible boosting by large-scale structure." Monthly Notices Of The Royal Astronomical Society, 415(4):3831-3850. http://www.dx.doi.org/10.1111/j.1365-2966.2011.18989.x.

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    Contact KU ScholarWorks
    785-864-8983
    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    785-864-8983

    KU Libraries
    1425 Jayhawk Blvd
    Lawrence, KS 66045
    Image Credits
     

     

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