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A deep 6-centimeter radio source survey.

E B Fomalont, K I Kellermann, J V Wall

    Science (New York, N.Y.)
    |July 6, 1984
    PubMed
    Summary
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    The Very Large Array detected faint radio sources 100 times weaker than previously possible. These sources are predominantly faint galaxies, suggesting new insights into cosmic radio emission.

    Area of Science:

    • Radio Astronomy
    • Extragalactic Astronomy

    Background:

    • Previous radio astronomy surveys have limitations in detecting faint radio sources.
    • Understanding the population of faint radio sources is crucial for cosmology.

    Purpose of the Study:

    • To survey a region of the sky at 6 cm wavelength with unprecedented sensitivity.
    • To investigate the source count of radio galaxies at microjansky flux densities.

    Main Methods:

    • Utilized the Very Large Array (VLA) for deep radio continuum observations.
    • Achieved a completeness limit of 60 microjanskys, significantly deeper than prior surveys.

    Main Results:

    • Detected radio sources approximately 100 times fainter than previously detectable limits.

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  • Observed source counts converging similarly to lower frequencies, with a potential excess below 100 microjanskys.
  • Identified the majority of detected sources as faint galaxies.

    • Conclusions:

    • The Very Large Array enables deeper radio surveys, revealing a more numerous population of faint radio sources.
    • The excess of very faint sources may indicate previously uncharacterized radio galaxy populations.
    • These findings contribute to our understanding of galaxy evolution and the cosmic radio background.