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    Extragalactic Source Counts at 24 Microns in the Spitzer First Look Survey

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    Wilson_2004_AJ_154(1)66.pdf (351.0Kb)
    Issue Date
    2004-01-01
    Author
    Marleau, Francine R.
    Fadda, D.
    Storrie-Lombardi, L. J.
    Helou, George
    Makovoz, D.
    Frayer, D. T.
    Yan, Lin
    Appleton, P. N.
    Armus, L.
    Chapman, S. C.
    Choi, P. I.
    Fang, Fang
    Heinrichsen, I.
    Im, M.
    Lacy, M.
    Shupe, D. L.
    Soifer, B. T.
    Squires, G.
    Surace, J.
    Teplitz, H. I.
    Wilson, Graham Wallace
    Publisher
    American Astronomical Society
    Type
    Article
    Article Version
    Scholarly/refereed, publisher version
    Metadata
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    Abstract
    We present the Spitzer Multiband Imaging Photometer 24 μm source counts in the Extragalactic First Look Survey (FLS) main, verification, and European Large Area ISO Survey N1 fields. Spitzer's increased sensitivity and efficiency in large areal coverage over previous infrared telescopes, coupled with the enhanced sensitivity of the 24 μm band to sources at intermediate redshift, dramatically improve the quality and statistics of number counts in the mid-infrared. The FLS observations cover areas of 4.4, 0.26, and 0.015 deg2, respectively, and reach 3 σ depths of 0.11, 0.08, and 0.03 mJy. The extragalactic counts derived for each survey agree remarkably well. The counts can be fitted by a super-Euclidean power law of index α = -2.9 from 0.2 to 0.9 mJy, with a flattening of the counts at fluxes fainter than 0.2 mJy. Comparison with infrared galaxy evolution models reveals a peak's displacement in the 24 μm counts. This is probably due to the detection of a new population of galaxies with redshift between 1 and 2, previously unseen in the 15 μm deep counts.
    Description
    This is the publisher's version, also available electronically from http://iopscience.iop.org/0067-0049/154/1/66/.
    URI
    http://hdl.handle.net/1808/17637
    DOI
    https://doi.org/10.1086/422584
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    • Physics & Astronomy Scholarly Works [1744]
    Citation
    Marleau, Francine R. et al. (2004). "Extragalactic Source Counts at 24 Microns in the Spitzer First Look Survey." Astrophysical Journal Supplement Series, 154(1):66-69. http://www.dx.doi.org/10.1086/422584.

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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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