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Optically Faint Microjansky Radio Sources.

Richards, Fomalont, Kellermann

    The Astrophysical Journal
    |November 7, 1999
    PubMed
    Summary
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    Deep radio surveys reveal most microjansky sources are starburst galaxies or active galactic nuclei. A fainter population may be heavily obscured starburst galaxies at higher redshifts.

    Area of Science:

    • Extragalactic Astronomy
    • Radio Astronomy

    Background:

    • Deep radio surveys provide crucial insights into galaxy populations.
    • Previous surveys have mapped radio sources in fields like the Hubble Deep Field (HDF).

    Purpose of the Study:

    • To identify radio sources in the deepest radio surveys to date.
    • To characterize the nature of microjansky radio sources in the HDF and Small Selected Area 13 fields.

    Main Methods:

    • Conducted radio surveys at 1.4 and 8.5 GHz.
    • Associated radio sources with optical and infrared counterparts.
    • Analyzed source properties including magnitude and color.

    Main Results:

    • Approximately 80% of microjansky radio sources are linked to moderate-redshift starburst galaxies or active galactic nuclei (AGN) with I-magnitudes between 17-24.

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  • A distinct population (20%) of radio sources are fainter (I>25 mag), often very red (I-K>4), and exhibit similar radio properties to brighter sources.
  • These fainter sources are potentially heavily obscured starburst galaxies at redshifts between 1 and 3.

    • Conclusions:

    • The majority of faint radio sources are likely associated with obscured starburst galaxies.
    • Alternative explanations for the fainter radio sources cannot be excluded based on current data.