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Related Experiment Videos

H i Absorption in the Steep-Spectrum Superluminal Quasar 3C 216.

Pihlström, Vermeulen, Taylor

    The Astrophysical Journal
    |October 8, 1999
    PubMed
    Summary

    Researchers detected neutral atomic hydrogen absorption in the quasar 3C 216 using the Westerbork Synthesis Radio Telescope. This finding offers insights into the gas content and evolution of young, powerful radio sources.

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    Area of Science:

    • Astronomy and Astrophysics
    • Radio Astronomy
    • Cosmic Gas Studies

    Background:

    • Strong compact steep-spectrum sources are key targets for studying neutral gas in young radio sources.
    • Understanding neutral gas provides insights into the evolution of powerful radio sources.

    Purpose of the Study:

    • To search for and characterize neutral atomic hydrogen (H i) absorption in strong compact steep-spectrum sources.
    • To probe the neutral gas contents and evolutionary stages of young radio sources.

    Main Methods:

    • Utilized the Westerbork Synthesis Radio Telescope (WSRT) with enhanced capabilities.
    • Detected a 0.31% deep H i absorption line at 850 MHz (UHF band) associated with quasar 3C 216.
    • Considered spectral line VLBI observations for precise localization of the absorbing gas.

    Main Results:

    • Successfully detected a significant H i absorption line in the superluminal quasar 3C 216 (z=0.67).
    • The absorption line was observed at 850 MHz, shifted from the 21 cm wavelength due to redshift.
    • The absorbing gas is likely located within the central kiloparsec, possibly in a jet-cloud interaction zone.

    Conclusions:

    • The detection of H i absorption in 3C 216 demonstrates the capability to study neutral gas in young radio sources.
    • The findings suggest the absorbing gas is associated with the source's central region, not extended galactic scales.
    • Jet-cloud interactions are proposed as the most plausible site for the observed H i absorption.

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